JPH0375635A - Optical recording medium - Google Patents

Abstract

PURPOSE:To obtain characteristics superior in all the properties, such as durability against repeated uses and heat stability by incorporating a specified ethylenic derivative having a hetero ring capable of changing the property of a cyclohexadiene ring formed by cyclization due to irradiation with light. CONSTITUTION:A recording layer contains the ethylenic derivative having an asymmetric hetero ring changing the property of a cyclohexadiene ring formed by cyclization in the positions 1 and 2 due to irradiation with light represented by formula I in which each of A and B is -CN or both may combine with each other to form -CO-Z-CO-; Z is -O- or optionally substituted nitrogen atom; R' is alkyl, halogen, or the like; R2 is alky, aryl, or the like; the ring Y is a hydrocarbon or hetero ring; and X is a thiophene, benzothiophene, thiazole, or oxazole ring, thus permitting the obtained recording medium to be thermally stable and not to cause thermochromism, changed in color by irradiation with light, and this state to be thermally stable and to be returned to the initial state by irradiation with another wavelength light, and these changes to be repeatedly executed.

Description

Detailed Description of the Invention [Field of Application in Industry A] The present invention relates to an optical recording medium, and more specifically, the present invention relates to an optical recording medium, and more specifically, the 1st and 2nd positions are cyclized by light irradiation to form a cyclohexadiene ring to improve its optical properties. The present invention relates to an optical recording medium using an ethylene derivative having an asymmetric heterocycle that causes a change in the number of rings.

[Prior Art] In recent years, much research has been conducted on the use of photochromic compounds as optical recording materials. In order to use a photoclock compound as an optical recording material, it is necessary that the following conditions be satisfied.

■ Must be semiconductor laser sensitive. That is, the absorption wavelength of the colored species (closed ring) is 650 nm or more.

■ Have a non-destructive read function.

■ Records must be thermally stable.

■ Excellent repeated durability.

■ High sensitivity.

Previously, the present inventor proposed the following bisindole-based compound as a photochromic compound that improves the semiconductor laser sensitivity (1) and the repeated durability (2) among the above problems.

Shinn3 1. ++13 Color-forming species (closed ring) As other photochromic compounds, the following dibenzothiophene compounds have also been proposed.Color-forming species (closed ring) [Problem to be solved by the invention] Among the above photochromic compounds, bisindole [A] Compounds have a problem in that they have poor thermal stability for recording, which is particularly important in recording materials.

-4, the dibenzothiophene-based compound [B] has excellent thermal stability for recording (2), but the absorption wavelength of the colored species (closed ring) is short, and there is a problem with the semiconductor laser sensitivity (2).

It is an object of the present invention to solve the above-mentioned conventional problems and to provide a high-performance optical recording medium using a photochromic compound that satisfies particularly important required properties for optical recording materials.

[Means and effects for solving the problem] The optical recording medium of claim (1) is an optical recording medium having a recording layer that records optical information by changing its optical properties by irradiation with light. The layer is characterized by containing an ethylene derivative represented by the general formula below, which has an asymmetric heterocycle in the 1st and 2nd positions that is cyclized by light irradiation to form a cyclohexadiene ring and change its optical properties. The optical recording medium according to claim (2) is the optical recording medium according to claim (1), wherein the ethylene derivative has the following general formula [II
] General formula [II! ] The optical recording medium of claim (3) is characterized in that the optical recording medium of claim (1) is characterized in that the ethylene derivative is represented by the following. The recording medium is an optical recording medium according to claim (1), in which the ethylene derivative is the following J Cu2 ■ ■ In other words, after synthesizing an intermediate represented by the above structural formulas ■ and ■, condensing the compounds ■ and ■ Accordingly, the dicyanoethylene derivative [III A ] according to the present invention can be obtained. Furthermore, this dicyanoethylene derivative [III
The maleic anhydride derivative [III B ] of the present invention can be produced by hydrolyzing and converting A ] into an acid anhydride.

The condensation reaction between compounds (1) and (2) can be carried out by subjecting these cyanomethyl derivatives to a condensation reaction in an alkaline environment in the presence of a phase transfer catalyst in a water-organic solvent to produce a dicyanoethylene derivative [mA]. .

The organic solvent used in the condensation reaction of compounds (1) and (2) is preferably a halogen solvent such as dichloromethane, chloroform, carbon tetrachloride, tetrachloroethane, or the like. Examples of the phase transfer catalyst include tetrabutylammonium bromide, tetrabutylammonium iodide, triethylbenzylammonium chloride, and the like. In addition, the alkaline agents used include sodium hydroxide,
Examples include potassium hydroxide. The reaction temperature for condensation is preferably from room temperature to 100°C, particularly preferably from 40 to 50°C.

Then, the above dicyanoethylene derivative [III A ]
This hydrolysis and acid anhydride reaction can be carried out using water or methanol, ethanol, ethylene glycol, ethylene glycol monomethyl ether, ethylene glycol monoethyl ether, diethylene glycol monoethyl ether, N-methylpyrrolidone, N
, N-dimethylformamide, 1,3-dimethyl-2-
In a polar solvent such as imidazolidinone, sodium hydroxide,
This can be carried out by heating from room temperature to the boiling point of the solvent in the presence of an alkaline agent such as potassium hydroxide. After the reaction, the product is neutralized with an acid and taken out as a solid, and if necessary, purified by column chromatography, recrystallization, solvent suspension washing, etc., to obtain the maleic anhydride derivative [III B ].

When the ethylene derivative according to the present invention is irradiated with light, the heterocycle W and the heterocycle W' cyclize to form a cyclohexadiene ring as shown in the following formula, and as shown in the formulas [IA] to [IA']. This causes a structural change that causes a color change. Also,
This colored state can be reversibly restored by photoreaction.

[A] [IA'] (ethylene derivative) (forms a cyclohexadiene ring) Specifically, for example, an indolylbenzothienyl maleic anhydride derivative represented by the following formula [III B ],
For example, when irradiated with 488 nm argon ion laser light, a structural change occurs as shown below, and the formula [1
The structure becomes 118'l, and the color changes from yellow to purple. Furthermore, since the absorption wavelength of this purple colored state extends to the semiconductor laser range, it can be reversibly returned to its original state as shown in the following formula by irradiating it with, for example, 670 nm semiconductor laser light.

[111B'] In particular, the ethylene derivative according to the present invention is in the open ring state [IA]
and the colored state (ring-closed state) CIA'] are thermally stable, and do not show a thermochromic reaction (thermal coloring reaction) even when heated at high temperatures for a long time, and the colored state is also stable. , shows no fading reaction, and both conditions are good (maintained).

Further, when an indole ring is present on one side of the carbon of the ethylene bond, the durability against repeated coloring and decoloring due to ring opening and closing is good, and the material is very useful as a reversible optical recording material.

Next, the optical recording medium of the present invention having a recording layer containing the novel ethylene derivative according to the present invention will be described.

The optical recording medium of the present invention basically consists of a substrate and a recording layer, but if necessary, an undercoat layer may be provided on the substrate or a protective layer may be provided on the recording layer. I can do it.

The substrate used in the present invention may be transparent or opaque to the light used. Examples of the substrate material include supports for general recording media such as glass, plastic, paper, plate-shaped or foil-shaped metals, and among these,
Plastic is preferred from various points of view. Examples of the plastic include acrylic resin, methacrylic resin, vinyl acetate resin, vinyl chloride resin, nitrocellulose, polyethylene resin, polypropylene resin, polycarbonate resin, polyimide resin, polysulfone resin, and the like.

The thickness of the information recording layer in the optical recording medium of the present invention is 10
A suitable range is 0λ to 100 μm, preferably 1000λ to 10 μm.

As a film forming method, commonly used thin film forming methods such as a vacuum evaporation method, a sputtering method, a doctor blade method, a casting method, a spinner method, and a dipping method can be employed.

The optical recording medium of the present invention may contain, for example, the ethylene derivative according to the present invention, if necessary, polyester resin, polystyrene resin, polyvinyl butyral resin, polyvinylidene chloride, polyvinyl chloride, polymethyl methacrylate, polybutyl methacrylate, etc. A recording layer is formed by dispersing or dissolving a binder such as polyvinyl acetate, cellulose acetate, epoxy resin, or phenol resin in a solvent such as carbon tetrachloride, benzene, cyclohexane, methyl ethyl ketone, or tetrachloroethane, and coating it on a suitable substrate. or by depositing the compound of the present invention on a suitable substrate by known vapor deposition methods or co-deposition methods with other compounds to form a recording layer; It can be easily obtained by dissolving it in a solvent such as and sealing it in a glass cell or the like.

In addition, in the case of film formation by the spinner method, the rotation speed is 500~
50 Q Or p m is preferable, and after coating, a treatment such as heating or exposure to solvent vapor may be performed depending on the case.

When forming a recording layer by a coating method such as a doctor blade method, a cast method, a spinner method, or a dipping method, especially a spinner method, coating solvents such as bromoform, dibromoethane, ethyl cellosolve, xylene, chlorobenzene, cyclohexanone, etc. with a boiling point of 120 are used. ~160°C is preferably used.

In addition, to improve the stability and light resistance of the recording layer, transition metal chelate compounds (e.g., acetylacetonate chelate, bisphenyldithiol, salicylaldehyde oxime, bisdithio-α) are used as stacked oxygen quenchers.
-diketone, etc.) or a tertiary amine compound.

The recording layer of the optical recording medium of the present invention may be provided on both sides of the substrate or only on one side.

Recording on the optical recording medium obtained as described above is carried out by irradiating the recording layer provided on both sides or one side of the substrate with light focused to about 1 to 10 μm, preferably laser light. The area irradiated with laser light or the like undergoes a color change due to photon effects. Recorded information can be reproduced by reading the difference in reflectance or absorbance between areas where a color change has occurred and areas where no color change has occurred.

Light sources used for the optical recording medium of the present invention include mercury lamps, xenon lamps, and laser light (N2
, He-Cd, argon ion, He-Ne, ruby,
Semiconductors, dye lasers, etc.

[Examples] Hereinafter, the present invention will be described in more detail with reference to Examples, but the present invention is not limited to the following Examples unless it exceeds the gist thereof.

Example 1 (1) Planning - shame Synthesis was carried out according to the following reaction formula.

■■ Shi113 藺■ 20 mA of DMSO (dimethyl sulfoxide) is water-cooled, and 1.6 g of 60 wt% NaH is added to this ice-cooled DMSO.
The mixture was heated to 30° C. and stirred overnight until hydrogen bubbles ceased. Next, 2.62 g of 2-methylindole
(o, 02 mol) was added to this ice-cooled warm mixture, and 3
It was heated to 0°C to completely dissolve the 2-methylindole. Then, while cooling in a water bath, methyl iodide 11.6
g was slowly added dropwise, and stirring was continued for about 1 hour. This thing is 160mj! When the mixture was poured into water and stirred well, a pale yellow solid was produced. This was extracted with benzene and dried to obtain the compound amount as a pale yellow solid. (Yield: 90%, b, p
,: 76-79℃ 72 mm Hg) 23 36mj! 25% by weight dimethylamine aqueous solution and 40m
A mixture of 1 and glacial acetic acid was cooled to 5°C in a water bath. 15mj for this! A 46% by weight formaldehyde aqueous solution was added thereto, and the mixture was similarly cooled to 5°C.

After cooling, 26.2 g of Compound 1 was added dropwise. A white solid formed with each drop. The mixture was slowly stirred until homogeneous. It was left at room temperature overnight.

Then 40g sodium hydroxide / 400 m 41
The mixture was poured into water, extracted with ether, washed with water, and dried. After removing the solvent, distillation was performed to obtain Compound 1.

(b, p,: 105°C/2 mm Hg) i-■
, 09.1 g of the compound was dissolved in 40 ml of absolute ethanol. While cooling the mixture, 7.8 g of methyl iodide was added dropwise.

The mixture was left at room temperature for 1 hour to form crystals. Then 0℃
The reaction was completed by standing overnight at . The generated solid was collected and washed twice with absolute ethanol and then three times with anhydrous ether to obtain Compound 4 as a white solid. (Yield: 90%) i″′″■. ■.

± ■10gNaC
17.2 g of Compound A was added to N/100 mj2 water and heated under reflux for 2 hours to separate an oil layer. The mixture was cooled, extracted with ether, washed with water, dried and evaporated. After column treatment of the product, the obtained solid was treated with an ether-n-hexane mixture (ether 20-hexane=1
: Recrystallization with 1) yielded Compound (2). (Yield: 40-7
0%) 6 33 g (o, 25 mol) of benzothiophene were dissolved in 150 mJL of dry tetrahydrofuran (THF). After cooling this to -30°C, 0.37 mj2 of n-butyllithium (hexane solution) was added dropwise, and the mixture was stirred for 1 hour.

After leaving it at room temperature for about 1 hour, it was cooled again to -10~oC, and 53 g of methyl iodide (
0.37 mol) was dissolved and added dropwise. -1ON No.
After stirring at °C for about 1 hour, it was left at room temperature overnight. Thereafter, after adding water, the product was extracted with ether, dried, and recrystallized from ethanol-water to obtain Compound 6 (2-methylbenzothiophene). (Yield: 8o%) 7 2g of 2-methylbenzophene 6 was added to 260mj2 of 1.
The mixture was dissolved in 2-dichloroethane, 33 g of chloromethyl ether was added thereto, and 50 mg of zinc chloride was added as a catalyst. After reacting for 30 minutes to 2 hours, extraction was performed with water-chloroform, and the organic layer was distilled off to obtain 2.4 g of a compound.

(Yield: 90%) Engineering ■ Chloromethyl form 7 1.42g to 10mj! of benzene, and 30 mg of tetra-n-butylammonium bromide and 2.5 g of sodium cyanide were dissolved in this to 10 mJ! An aqueous solution of was added thereto, and the mixture was vigorously stirred while heating at 60° C. for 2 to 3 hours.

After the reaction was completed, the mixture was extracted with benzene, and the organic layer was dried and purified by silica gel chromatography to obtain 1.07 g of cyanomethyl compound (2). (Yield: 74%) - [III A] Compound 01.012g (0,0055 mol) and compound 01.028g (o, 0055 mol) were mixed with carbon tetrachloride 1
．． Dissolve 58 mu and benzene in 1.58 ml and add to this.
0.14 g of tetrabutylammonium bromide was added and heated to 40°C. Furthermore, NaOH water t'gt&(50
% by weight) was added dropwise over 30 minutes. The product was poured into water, extracted with chloroform, dried, the solvent was distilled off, treated with benzene column chromatography, and fractionated using liquid chromatography to obtain the compound [rn A ] with the physical properties shown in (2) below. . (Yield: 10%) (2) Hitachi A Mass spectrum: 367 (M”) λ□ of the open ring form: 420 nm λ of the closed ring form, x: 554 nm (3) Synthesized using the above (1) A yellow solution obtained by dissolving the compound [IHA] in bebenzi at a concentration of 10-4 mol/°C was sealed in a 1 cm x 1 cm x 4 cm glass cell, and when the cell was irradiated with 435 nm monochromatic light for 5 minutes, the results were shown in Figure 1. Colored fit with maximum absorption at 554 nm as shown in
(Closed ring) [mA'].

C) In place of 2.0 g of the compound represented by 13 [III A ], the following structural formula % Formula % This colored state is very thermally stable, with
As shown in FIG. 2, no decrease in the absorption of the colored state was observed even after heating for more than an hour.

Next, when the glass cell mercury lamp in the colored state was combined with a filter and monochromatic light of 578 nm was irradiated for 5 minutes, the color immediately disappeared and changed to the original yellow state. This change could be repeated over 100 times.

Example 2 (1) Using 1.8 g of the compound represented by the following structural formula in Example 1, a compound [II A ] having the physical properties shown in (2) below was obtained in the same manner as in Example 1. Ta.

[II A] (2) "L value mass spectrum of substance": 345 (M") λ□U of ring-opened form: 412 nm λwax of closed ring form: 549 nm (3) And the above ( The compound synthesized in 1) [1
1A] in a glass cell sealed with a benzene solution of 435n
When irradiated with monochromatic light of m for 5 minutes, it changed into a colored body (closed ring body) having maximum absorption at 549 nm, as shown in FIG. This colored state is very thermally stable and 8
Even after being left at 0° C. for 12 hours or more, no change in the coloring state was observed.

Next, combine the mercury lamp and filter 578, and turn it on.
When irradiated with m monochromatic light for 5 minutes, the color disappeared immediately.
changed to its original state. This change could be repeated over 100 times.

Example 3 (1) 5 mA of i-water and 2.4 g (0.04 mol) of potassium hydroxide were stirred to dissolve the potassium hydroxide. Next, 5 mu of ethylene glycol monoethyl ether and 2 g of a dicyanoethylene compound represented by the following structural formula [II A ] (0,00
6 mol> was added thereto, and the mixture was reacted for 30 hours under stirring and reflux. After the reaction was completed, it was cooled to room temperature and heated to 50mj! poured into the water. The solids were filtered and the filtrate was made neutral to slightly acidic with dilute hydrochloric acid. The precipitated yellow solid was diluted with 100 mJiL of ether for 3
The extract was extracted twice and dried over anhydrous sodium sulfate. The ether was distilled off, and the resulting oily product was subjected to silica gel column chromatography (benzene:hexane=1:1).
and crystallized from ether-petroleum ether.

As a result, a yellow-yellow bundle of compound [II B ] having the physical properties shown in (2) below was obtained. (Yield: 20%) [II B ] (2) 1 E mass spectrum: 385 (M”) λ+max of ring-opened product: 452 nm Compound 19.[
When a glass cell containing a benzene solution of [11B] was irradiated with 488 nm light from an argon ion laser for 2 minutes, it changed to a colored body (closed ring body) with an absorption maximum at 595 nm, as shown in Figure 4. . This colored state was very stable thermally, and no change was observed in the colored state even after being left at 80° C. for 12 hours or more.

Next, when irradiated with He-Na laser light (633 nm) for 2 minutes, the color immediately disappeared and changed to the original state. This change could be repeated over 100 times. Note that this absorption smoothness change could be similarly caused using a 670 nm semiconductor laser.

Example 4 200 mg of the compound synthesized in Example 3 (1) above and 20 g of polystyrene (molecular weight 160,000) were mixed in 400 g of toluene.
For nail j2: After dissolving and applying the solution on the glass substrate,
A recording layer was prepared by drying.

This recording layer was irradiated with 488 nm argon ion laser light for 2 minutes to make the entire surface colored.

This colored state was very stable thermally, and no fading was observed even after being left at 80° C. for more than 2 hours.

Next, when writing was attempted using a He-N6 laser (10 mW; 633 nm), the coloring immediately faded after irradiation for 30 seconds. This cycle of coloring and fading could be repeated over 100 times.

Example 5 Compounds shown in Table 1 below were synthesized by a method similar to Example 1. When each compound was irradiated with ultraviolet rays in a benzene solution, each compound developed a color shown in Table 1.

Sealing S 1 Table (Part 1) Table (Part 3) Table (Part 2) (Part 5) (Part 2) Example 6 Compounds shown in Table 2 below were synthesized by a method similar to Example 3. did. When each compound was irradiated with ultraviolet rays in a benzene solution, each compound developed a color shown in Table 1.

Table 2 (Part 1) Table (Part 3) Table 2 (Part 4) In both Examples 5 and 6, the colored state was very stable thermally, and the coloring - decoloring The change in is 10
I was able to repeat this more than 0 times.

[Effects of the Invention] As detailed above, the optical recording medium of the present invention is thermally stable, does not exhibit thermochromism, changes color when irradiated with light, and this state is extremely stable thermally. . Then, when light of a different wavelength is irradiated, it returns to its original state, and this change can be repeated.

Therefore, according to the optical recording medium of the present invention, a high-quality reversible recording medium capable of recording in photon mode is provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing optical changes in the absorption spectrum of compound [III A ] in the optical recording material prepared in Example 1. FIG. 2 is a diagram showing the thermal stability at 80° C. of the colored state of the compound of the present invention in the optical recording material prepared in Example 1 (3) after irradiation with 435 nm light. FIG. 3 is a diagram showing optical changes in the absorption spectrum of the compound of the present invention [n A ] in the optical recording material prepared in Example 2 (3). FIG. 4 is a diagram showing optical changes in the absorption spectrum of the compound [II B ] of the present invention in the optical recording material prepared in Example 3 (3).

Claims (5)

[Claims] (1) In an optical recording medium having a recording layer that records optical information by changing its optical properties by light irradiation,
The following general formula [I] in which the recording layer has an asymmetric heterocycle at the 1st and 2nd positions that is cyclized by light irradiation to form a cyclohexadiene ring and change its optical properties: ▲Mathematical formula, chemical formula, table, etc. There is a
A group represented by O-Z-CO-, where Z represents oxygen or an optionally substituted nitrogen atom. R^1 represents an alkyl group, a halogen atom, or a trifluoromethyl group. R^2 represents an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted cycloalkyl group. Ring Y represents an optionally substituted carbocycle or heterocycle. X represents an optionally substituted thiophene ring, benzothiophene ring, thiazole ring or oxazole ring. ] An optical recording medium characterized by containing an ethylene derivative represented by the following. (2) The ethylene derivative has the following general formula [II] ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ ... [II] [In the formula, A and B are both -CN groups or are connected to each other to form -C
A group represented by O-Z-CO-, where Z represents oxygen or an optionally substituted nitrogen atom. R^1 and R^5 represent an alkyl group, a halogen atom or a trifluoromethyl group. R^2 represents an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted cycloalkyl group. R^3, R^4, R^6, R^7 are each hydrogen atoms,
Halogen atom, hydroxy group, optionally substituted alkyl group, optionally substituted alkoxy group, cyano group, nitro group, optionally substituted alkoxycarbonyl group, trifluoromethyl group, optionally substituted Good aryl group, optionally substituted cycloalkyl group,
Optionally substituted aryloxycarbonyl group, optionally substituted mono- or dialkylaminocarbonyl group, optionally substituted alkylcarbonyloxy group, optionally substituted arylcarbonyloxy group, represents an atom or group selected from the group consisting of an optionally substituted aryloxy group, an optionally substituted alkoxycarbonyloxy group, and an optionally substituted aryloxycarbonyloxy group. ] The optical recording medium according to claim 1, characterized by: (3) The ethylene derivative has the following general formula [III] ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ ... [III] [In the formula, A and B are both -CN groups or are connected to each other to form -C
A group represented by O-Z-CO-, where Z represents oxygen or an optionally substituted nitrogen atom. R^1 and R^5 represent an alkyl group, a halogen atom or a trifluoromethyl group. R^2 represents an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted cycloalkyl group. R^3, R^4, R^6, R^7 are each hydrogen atoms,
Halogen atom, hydroxy group, optionally substituted alkyl group, optionally substituted alkoxy group, cyano group, nitro group, optionally substituted alkoxycarbonyl group, trifluoromethyl group, optionally substituted Good aryl group, optionally substituted cycloalkyl group,
Optionally substituted aryloxycarbonyl group, optionally substituted mono- or dialkylaminocarbonyl group, optionally substituted alkylcarbonyloxy group, optionally substituted arylcarbonyloxy group, represents an atom or group selected from the group consisting of an optionally substituted aryloxy group, an optionally substituted alkoxycarbonyloxy group, and an optionally substituted aryloxycarbonyloxy group. ] The optical recording medium according to claim 1, characterized by: (4) The ethylene derivative has the following general formula [IV] ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ ... [IV] [In the formula, A and B are both -CN groups or are connected to each other to form -C
A group represented by O-Z-CO-, where Z represents oxygen or an optionally substituted nitrogen atom. R^1 and R^5 represent an alkyl group, a halogen atom or a trifluoromethyl group. R^2 represents an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted cycloalkyl group. R^3, R^4, and R^6 are each a hydrogen atom, a halogen atom, a hydroxy group, an optionally substituted alkyl group, an optionally substituted alkoxy group, a cyano group, a nitro group, or a substituted good alkoxycarbonyl group,
Trifluoromethyl group, optionally substituted aryl group, optionally substituted cycloalkyl group, optionally substituted aryloxycarbonyl group, optionally substituted mono- or dialkylaminocarbonyl group, substituted an optionally substituted alkylcarbonyloxy group, an optionally substituted arylcarbonyloxy group, an optionally substituted aryloxy group, an optionally substituted alkoxycarbonyloxy group, and an optionally substituted aryloxycarbonyl group Represents an atom or group selected from the group consisting of oxy groups. ] The optical recording medium according to claim 1, characterized by: (5) The ethylene derivative has the following general formula [V] ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼ ... [V] [In the formula, A and B are both -CN groups or are connected to each other to form -C
A group represented by O-Z-CO-, where Z represents oxygen or an optionally substituted nitrogen atom. R^1 and R^5 represent an alkyl group, a halogen atom or a trifluoromethyl group. R^2 represents an optionally substituted alkyl group, an optionally substituted aryl group, or an optionally substituted cycloalkyl group. R^3, R^4, and R^6 are each a hydrogen atom, a halogen atom, a hydroxy group, an optionally substituted alkyl group, an optionally substituted alkoxy group, a cyano group, a nitro group, or a substituted good alkoxycarbonyl group,
Trifluoromethyl group, optionally substituted aryl group, optionally substituted cycloalkyl group, optionally substituted aryloxycarbonyl group, optionally substituted mono- or dialkylaminocarbonyl group, substituted an optionally substituted alkylcarbonyloxy group, an optionally substituted arylcarbonyloxy group, an optionally substituted aryloxy group, an optionally substituted alkoxycarbonyloxy group, and an optionally substituted aryloxycarbonyl group Represents an atom or group selected from the group consisting of oxy groups. ] The optical recording medium according to claim 1, characterized by: