JPS59104653A - Electrophotographic sensitive body - Google Patents

Abstract

PURPOSE:To obtain always a good copied image with high sensitivity without any accumulation of potential even during repeated uses by incorporating a specified bisazo compd. in a carrier generating layer and a specified styryl compd. and an amino deriv. in a carrier transfer layer. CONSTITUTION:A carrier generating layer incorporates a compd. represented by formula I or II in which Ar1, Ar2, Ar3 are optionally substd. aromatic carbon rings; R1, R2 are electron acceptor groups, such as CN; A is one of groups represented by formulae III-V, or the like; X is OH, optionally substd. amino, or the like; A' is optionally substd. aryl; Y is H, halogen, optionally substd. alkyl, or the like; Z is an atomic group constituting an optionally substd. aromatic carbon or hetero ring; R3 is H, optionally substd. amino, COOH, or the like; n is 1 or 2; and m is 0-4. A carrier transfer layer incorporates a compd. represented by formula VI or VII in which R7, R8 are each optionally substd. alkyl or phenyl; R9 is optionally substd. phenyl, naphthyl, heterocyclic, or the like; R10-R13 are each H, halogen, or the like. Thus, a photosensitive body of long life is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic photoreceptor in which a photosensitive layer comprising a combination of a carrier generation phase and a carrier transport phase is provided on a conductive support.

Until now, a carrier generation layer (hereinafter referred to as [CGLJ]) is formed by containing a carrier generation substance (hereinafter referred to as ICGMJ) that absorbs visible light and generates charge carriers (hereinafter simply referred to as "carriers"). ) and a carrier transporting material (hereinafter referred to as IC'l'MJ) that transports either or both of the positive and negative carriers generated in this CGL (hereinafter referred to as IC'l'MJ).
It has been proposed that the photosensitive layer of an electrophotographic photoreceptor is formed by combining TLJ and TLJ.

In this way, by assigning the two basic functions of carrier generation and carrier transport, which are necessary for photosensitive layer fabrication, to separate layers, the range of materials that can be used in the composition of the photosensitive layer can be widened. , it becomes possible to independently select materials or material systems that optimally perform each function, and by doing so, it is possible to independently select materials or material systems that optimally perform each function.
It constitutes an electrophotographic photoreceptor having excellent properties such as a low surface potential when charged upside down, high charge retention capacity, high photosensitivity, and high stability during repeated use. becomes possible.

Conventionally, as such a photosensitive layer, the following ones are known, for example.

(1) CGL made of amorphous selenium or side-stop cadmium
A structure in which CTLs made of poly-N-vinylcarbazole are laminated.

(2) C consisting of amorphous selenium or cadmium sulfide
61. and C'i''L containing 2,4,7-dolinitro-9-fluorenone.

(3) A structure in which a CGL made of a perylene derivative and a CTL containing an oxadiazole derivative are laminated (see US Pat. No. 3,871,882).

(4; CT containing CGL consisting of chlordiane blue or methylscalyllium and pyrazoline visiting conductor
A structure in which the layers are stacked in an L shape (see Japanese Patent Laid-Open No. 51-90827).

(5) CGL made of amorphous selenium or its alloy and C containing a polyarylalkane aromatic amino compound
Laminated structure with TL (Patent application 147251/1989)
No. Specification).

(6) CGL containing a perylene derivative and 1. l-'
C containing a realylalkane aromatic amine compound
A structure in which T and L are laminated (Patent application 1987-1990)
No. 7 specification,).

As described above, many types of photosensitive layers are known, but in conventional electrophotographic photoreceptors having such photosensitive layers, the electricity of the photosensitive layer when repeatedly subjected to electrophotographic processes is limited. It has the disadvantage of severe mechanical fatigue and extremely short service life.

For example, when the electrophotographic process C is repeatedly applied, the Is history state of the potential of the electrophotographic photoreceptor is not stably maintained, making it impossible to obtain stable image forming characteristics.

In addition, specific bisazo compounds can be used as CGMs, for example, in JP-A-55-117151 and JP-A-54.
Although it is disclosed in Publication No.-145142, etc.
Even in combination with CTM, which is said to be able to be combined with 1 to 1, the above-mentioned drawbacks are still considerable.

As can be understood from this, a carrier transporting substance that is effective against a specific carrier-generating substance is not always effective against other carrier-generating substances, and An effective carrier generating substance is
It cannot be said that it is always effective for other carrier axis substances.

In the case of both materials, if the mixture is inappropriate, the electrophotographic sensitivity will not only be low, but also the emission efficiency will be poor (11) especially at low electric fields.
・As a result, the so-called residual potential increases, and in the worst case (・
Each time it is used in a crooked manner, a potential accumulates, making it practically unusable for electronic photographic purposes.

In this way, there is no lawful way to select a suitable combination of the constituent materials of the carrier generation phase and the decomposed material for carrier transport, and there are many material details to choose from in a practical manner. It is necessary to make a decision.

The present invention has a photosensitive layer that combines a carrier generation phase and a carrier 4 fit phase, has high sensitivity, and maintains a stable potential history state even when repeatedly subjected to an electrophotographic process. An object of the present invention is to provide an electrophotographic photoreceptor that can always form good visible images.

The above object is to provide an electrophotographic photoreceptor in which a photosensitive layer consisting of a combination of a carrier generation phase and a carrier transport layer is provided on a conductive support, wherein the carrier generation phase has the following general formula C.
I) or a bisazo compound represented by the general formula [I'], and the carrier transporting material is at least a styryl compound represented by the following general formula [111] and an amine derivative represented by the following general formula [1[I]. This is achieved by an electrophotographic photoreceptor characterized by containing one of the two.

General formula [I] R・1 A-N=N-Ar 1-CH-c-Ar 2-CI-i
=cH-Ar 5-N=NA General formula [I'] [In the formula.

Ar1. Ar2 and (7Ar3' are respectively substituted and unsubstituted carbocyclic aromatic ring groups.

River or R2: each electron-withdrawing group, Y: hydrogen atom,
Halogen atoms, substituted or unsubstituted alkyl groups, alkoxy groups, carboxyl groups, sulfo groups, substituted or unsubstituted carbamoyl groups, or substituted or unsubstituted sulfamoyl groups, (however, when m is 2 or more, mutually different ) Z: atomic group necessary to constitute a substituted or unsubstituted carbocyclic aromatic ring or a substituted or unsubstituted heterocyclic aromatic ring, R3: hydrogen atom, substituted or unsubstituted Substituted amino group, substituted or unsubstituted carbamoyl group, carboxyl group or ester group thereof.

A': substituted or unsubstituted aryl group, n: an integer of 1 or 2, m: an integer of 0 to 4. ] General formula [■] [In the formula, R7, ■ (8: represents a substituted or unsubstituted alkyl group or phenyl group, and the substituent is an alkyl group, an alkoxy group, or a phenyl group 8 R9: substituted or unsubstituted represents a phenyl group, naphthyl group, anthryl group, fluorenyl group, or a heterocyclic group, and as a substituent, an alkyl group, an alkoxy group, a halogen atom, a hydroxyl group, or a phenyl group is used.

R1o=R1s: represents a hydrogen atom, a halogen atom, an alkyl group, an alkoxy group, or an alkylamino group. ) General formula [I[[) In the formula, A r 4, Ar 5 represents a substituted or unsubstituted phenyl group, and a halogen atom, an alkyl group, a nitro group, or an alkoxy group is used as a substituent.

Ar6: represents a substituted or unsubstituted phenyl group, naphthyl group, anthryl group, fluorenyl group, or heterocyclic group, and substituents include an alkyl group, an alkoxy group, a halogen atom, a hydroxyl group, an aryloxy group, an aryl group, an amino group, Nitro groups, piperidino groups, morpholino groups, naphthyl groups, anthryl groups and substituted amine groups are used. However, an acyl group, an alkyl group, an aryl group, or an aralkyl group is used as a substituent for the substituted amine/group. ] Among the bisazo compounds represented by the general formula CI') or the general formula [1'], the following general formula [Ta) is preferred.
Or it is represented by the general formula CI'a:l.

General formula (Ia'll N 薯AN=N-Ar1-CIt-CAr2 cH=ct(
Ar5 N=N-AA-N=N-Ar1-CIl=C-
Ar2-C=(ll-Ar3-N=IN-A [wherein Ar1, Ar2, Ar5+6 and A general formula CI) or the same as the first one defined in general formula [I'] . ] Even more preferred are those represented by the following general formula Clb) or I'b).

General formula [1b] N A-N=N-Ar 7-C11=C-Ar8-CI-1
= Ckl-A r 9-N=N -A [wherein, A is the same as the general formula I] or the general formula [I/], Ar7, ArB and M: substituted, unsubstituted It represents the phenyl group of the canter, and the animal-handling groups include alkyl threads such as methyl group and ethyl group, alkoxy groups such as methoxy group and ethoxy group, halogen atoms such as chlorine atom and bromine atom, hydroxyl group and cyan group. The selected one is preferred. ] That is, in the present invention, the bisazo compound represented by the general formula (13 or general formula [■']) is used as a CGM, and the styryl compound represented by the general formula [■] and/or the bisazo compound represented by the general formula [111] is used as a CGM. By combining these using C'l''M as an amine-conducting conductor,
It constitutes a photosensitive layer of a so-called functionally separated photoreceptor in which carrier generation and transport are performed using separate substances. This makes it possible to create an electrophotographic photoreceptor that maintains a stable potential history state even when subjected to repeated electrophotographic processes (17) and is therefore capable of always forming a well-defined visible image. can be provided.

Akira Motomoto again? In the 11-child photographic photoreceptor, especially wavelength 6
A large spectral sensitivity can be obtained even in the long wave wavelength range of 00 to 700 nm, and therefore it can be used as a light beam for forming helium-neon lasers with a wavelength of 6328 A, which is the lowest in history. , J,i;l I) '47 o'clock (C non-end rol
Since the potential of l is zero or close to this (τ), it is not possible to obtain a large effective bias.One-component solution consisting only of toner (1:,: also works well with agent) t-5 be able to.

Specific examples of the bisazo compound represented by the general formula [I] include those having the following structural formula, but are not limited to these.1 Exemplary Compound V-No.
-The above general formula [1']
As a specific example of the bisazo compound represented by the formula, those having the following structural formulas may be used, but these compounds are not sufficient.

Exemplary compound Styryl compound represented by the general formula [11] 1;
Examples include, for example, those having the following structural formula, but are not limited thereto.

Illustrated figurine (n-]) (n-2) (11,-3) (II-4) (n-5) (It-6) (II-7) (II-8) (11-9) ( IJ -10) (11-11) (II-12) (n-13) (u-14) (n-15) (II -16') 3G (11-22) (1,1-23) (II -24) (11-25) (n-26) (1,t-27) (II-28) (L[-32) (II-33) (IF-34) Represented by the above general formula (Ill) Specific examples of amine derivatives include, but are not limited to, those having the following structural formula.

Exemplary compounds (In-1) (Ill-2) (III-3) (Ill-4) (111-ri) (tu-6) (Ill-7) (nt-s) (■t-9) (nu -10) (III-11) (111-12) (III-13) (III-14) (Ill-15) (III-16) (III-17) (III-18) (III-19) (Hl -20) (Ill-21) (llll-22) (Ill-23) (ill-24) (III -25) (Ill-26) (III-27) (III-28) (■-29) (III -30) (III-31) (III-32) (III-33) Next, the mechanical structure of the electrophotographic photoreceptor of the present invention will be explained.

In one example of the present invention, as shown in FIG.
A CGL 2 containing the above-mentioned bisazo compound as a main component is formed on the sexual support 1, and a CTL 3 containing the above-mentioned styryl compound and/or amine derivative as a main component is formed on this CGLZ. These CGL2 and CTL3 constitute the photosensitive layer 4.

Here, as the material of the conductive support 1, for example, a sheet of metal such as aluminum, nickel, copper, zinc, palladium, silver, indium, tin, platinum, gold, stainless steel, or brass may be used. can,.

However, the invention is not limited thereto, and for example, as shown in FIG. 2, a conductive layer IB may be provided on an insulating base IA to constitute the conductive support 1. In this case, the base IA may be % of paper, plastic sheets) and has sufficient strength against stress such as bending and tension. The conductive layer IB can also be provided by laminating metal sheets, vacuum depositing metals, or by other methods.

The above-mentioned CG L 2 is made of the above-mentioned bisazo compound alone, or added with a suitable binder resin, or further added with a substance having a high mobility for specific or non-specific polar carriers, that is, CTM. can be formed.

As a specific method, a method is conveniently used in which the above-described bisazo compound is dissolved or dispersed in an appropriate solvent or dissolved or dispersed together with an appropriate binder resin and then dried. Ru.

In this method, examples of the solvent or dispersion medium include RL-butylamine, diethylamine, ethylenediamine, improperamine, monoethanolamine, triethanolamine, triethylenediamine, N,
Using N-dimethylformamide, acetone, methyl ethyl ketone, cyclohexanone, benzene, toluene, xylene, chloroform, 1,2-dichloroethane, dichloromethane, tetrahydrofuran, dioxane, methanol, ethanol, impropanol, ethyl acetate, butyl acetate, dimethyl sulfoxide, etc. be able to.

Further, as the binder resin, for example, polyethylene,
Boria 0 lopyrene, acrylic resin iT, methacrylic resin, vinyl chloride resin, vinyl acetate resin, epoxy i-ton L
) l, polyurethane resin) Ih, phenol 1JI, polyester resin, alkyd 4III resin, polycarbonate resin, silicone resin, melamine resin I, etc., addition polymerization type resin, polyaddition type a + resin, polycondensation type (・71 resin and copolymer resins containing two or more of the repeating units of these resins, such as vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-maleic anhydride copolymer resin, etc. In addition to insulating paulownia, polymeric organic semiconductors such as poly-N-vinylcarbazole can also be used.The ratio of this binder resin to the bisazo compound is 0 to 100% by weight, particularly 0 to 10% by weight. is within the range of

An appropriate CTM may be added to the CGL2 as necessary.

The thickness of the CGL 2 formed as described above is preferably 0.005 to 20 microns, particularly preferably 0.005 to 20 microns, particularly preferably 0.
．． 05-5 microns. If it is less than 0.005 microns, sufficient photosensitivity cannot be obtained, and if it exceeds 20 microns, sufficient charge retention cannot be obtained.

Further, the CTL3 can be formed using the styryl compound and/or the amine enzyme conductor described above in the same manner as the CGL2 described above, that is, alone or together with a binder resin. Further, other CTMs may be included. The size of this CTL3 is 2 to 100 microns, preferably 5 to 100 microns.
It is 30 microns.

The electrophotographic photoreceptor of the present invention may have other mechanical configurations. For example, as shown in FIG. 3, a suitable intermediate layer 5 may be provided on the conductive support 1, a CGL 2 may be formed through this, and a CTL 3 may be formed on this CGL 2. This intermediate layer 5 has a function of preventing free carriers from being injected into the photosensitive layer 4 from the conductive support l when the photosensitive layer 4 is charged, or a function of preventing the photosensitive layer 4 from being injected into the photosensitive layer 4 from the conductive support. It can function as an adhesive layer that adheres to body weight. Materials for the intermediate layer 5 include metal oxides such as aluminum oxide and indium oxide, acrylic resin, methacrylic resin, and vinyl chloride (υj&
, vinyl acetate resin, epoxy hatsumode, polyurethane juzuki a
, phenol 4-ring moon, polyester resin Jfti, alkyd resin, polycarbonate resin, silicone resin, melamine fat, vinyl chloride-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate-maleic anhydride copolymer (II)
A material such as fat can be used.

Further, as shown in FIG. 4, C'i'' L 3 is formed on the conductive support 1 with or without the intermediate layer 5, and CGL 2 is formed on this CT L 3. The photosensitive layer 4 may also be constructed using the following methods.

In history, the bisazo compound described above was dispersed in a carrier transport phase in which the styryl compound and/or amine derivative described above were self-contained to form a carrier generation phase, and a single layer of photosensitive material was obtained. It is also possible to form -.

Incidentally, a citron additive may be added to the layer constituting the photosensitive layer in the present invention, if necessary.

Examples of the present invention will be described below, but the present invention is not limited thereto.

Example 1 A vinyl chloride-vinyl acetate-maleic anhydride copolymer [from S-LEC MF' = 10J (manufactured by Tanezu Chemical Industry Co., Ltd.) An intermediate layer having a thickness of about 0.05 microns is provided, and the exemplified compound (1-9
) was dispersed with 100+ nJ of 1,2-dichloroethane in a ball mill for 8 hours, and the resulting dispersion was applied onto the intermediate layer using a doctor blade, dried thoroughly, and peeled. io, 5 micron CGI, form the second.

On the other hand, styryl compound 11.25.9 shown as exemplified compound (II-22) and 15 g of polycarbonate resin 1 Panlite L-1250J (manufactured by Reidai Kasei Co., Ltd.) were dissolved in 100 ml of 1,2-dichlorot-ethane, The obtained solution was applied onto the CG I- using a doctor blade and thoroughly dried to form a CTL of 12 mm and 12 microns, thereby producing an electrophotographic photoreceptor of the present invention. This is referred to as 1 sample 1.

Example 7111 Examples 2 to 8 Seven types of electrophotographic photoreceptors of the present invention were prepared in the same manner as in Example 1, except that in the formation of CGL and CTL, the combinations shown in Table 1 below were used as exemplary compounds. Manufactured. These will be referred to as 1 sample 2'' to 1 sample 8, respectively.

Table 1 Example 9 An intermediate layer was provided on a conductive support in the same manner as in Example 1, and 1.5 g of the bisazo compound shown as exemplified compound (1-9) and a polycarbonate resin [Pasolite l, -
159 of 1250J and 100 of 1,2-dichloroethane
In addition to mJ, apply with a doctor blade using a ball mill for 12 hours, and dry thoroughly to form a C of approximately 1 micron in thickness.
GL was formed.

On this CGL, CTL was added in the same manner as in Example 1.
was formed, thereby producing an electrophotographic photoreceptor of the present invention. This will be referred to as "Sample 9."

Example 10 In the formation of CGL, the exemplified compound (+'-43) was used as the bisazo compound, and in the formation of CTL, the exemplified compound (n-33) was used as the styryl compound.
An electrophotographic photoreceptor of the present invention was produced in exactly the same manner as in Example 9 except that the material shown in . 1 sample of this 10"
shall be.

Comparative Example 1 A comparative electrophotographic photoreceptor was produced in the same manner as in Example 1, except that pyrazoline 811 having the following structural formula was used instead of the styryl compound in the formation of CTL in Example 1. This will be referred to as "comparative sample 1."

Comparative Example 2 A comparative electrophotographic photoreceptor was produced in the same manner as in Example 1, except that an oxadiazole derivative having the following structural formula was used in place of the styryl compound in forming the CTL in Example 1. This will be referred to as 1 Comparative Sample 2.

The electrophotographic photoreceptors obtained as described above, Samples 1 to 10, Comparative Sample 1, and Comparative Sample 2 were each tested using an "Electrometer Model 5P-428" (manufactured by Kawaguchi Denki). The photographic characteristics were investigated. That is, the acceptance potential ■A (V) when the photoreceptor surface is charged for 5 seconds at a charging voltage of -6 KV, and the potential VI after dark decay for 5 seconds.
Exposure amount E required to reduce (initial potential) to IA
1/2 (1uxa seconds), further 8) f decay rate (VA-
Vl)/VAX100 (%).

The results are shown in Table 2.

Table 2 From the results in Table 2, it is clear that the electrophotographic photoreceptor of the present invention has a high sensitivity.

In addition, each of Samples 1 to 1o and Comparative Sample 1 and Comparative Sample 2 was dry-electronically copied 11.4 I-U-B i x
2000Rj (manufactured by Konishiroku Photo Industry Co., Ltd.) for continuous copying, and the black paper potential vb at an exposure aperture value of 1.0.
(v) and white paper potential Vw (V) were determined using an "Electrostatic Voltmeter 1441)-1D Model" (manufactured by Monroe Electronics, Inc.) immediately before development. The results are shown in Table 3.

The black paper potential here refers to the surface potential of the photoreceptor when the above-mentioned copying cycle is performed using a black paper with a reflection density of 1.3 as the original, and the white paper potential refers to the surface potential of the photoreceptor when the original is a black paper with a reflection density of 1.3. Represents the surface potential of the body.

Table 3 (However, △vb (v) and △Vw (V) in the table indicate the amount of variation in the black paper potential vb (v) and white paper potential VW (V), respectively, and + in the variation amount indicates an increase As is clear from the results in Table 3, the electrophotographic photoreceptor of the present invention maintains the potential history state stably even when subjected to repeated electrophotographic processes, resulting in good image quality. A large number of visible images can be stably formed.

[Brief explanation of the drawing]

FIG. 1 shows an example of the structure of the electrophotographic photoreceptor of the present invention.
2 is an explanatory sectional view showing another example of the electrophotographic photoreceptor of the present invention, and FIGS. 3 and 4 are explanatory sectional views showing still other examples of the electrophotographic photoreceptor of the invention, respectively. FIG. ■ ... Transmissive support 2 ... Carrier generation layer (CGL) 3 ... Carrier transport II (CTL) 4 ... Photosensitive layer 5
... Intermediate layer IA... Insulating base IB...
R'' ° [store (inside'; no change in A) difference l of exclusive electric layer drawing
Decoy Figure 2, Figures 3 and 4, Procedural Amendments, Ka,,:) April 2, 1982 Commissioner of the Patent Office Kazuo Wakasugi Representation of the case 1982 Patent Application No. 214034 2 Title of the invention Electronic photography Photoconductor 3, relationship with the amended person case Patent applicant 6 - Riga; 1-26 Nishi-Shinjuku, Shinjuku-ku, Tokyo @
No. 2 Trap v11 name) (127) Roku Konishi Photo Industry Co., Ltd. 4, Agent 5 Date of amendment order March 29, 1981 6 Number of inventions increased by amendment 2) Engraving of drawings (no change in content) )

Claims (1)

[Scope of Claims] 1) An electrophotographic photoreceptor comprising a photosensitive layer comprising a combination of a carrier generation phase and a carrier transport phase provided on a conductive support, wherein the carrier generation phase is formed by the following general formula CI) or the general formula It is characterized by containing a bisazo compound represented by the formula [lI], and at least one of the carrier transport compound, a styryl compound represented by the following general formula [■], and an amine derivative represented by the following general formula [III]. An electrophotographic photoreceptor. General formula [I] 1(1 A-N=N-Ar1-C1-1=c-Ar2-CH,=
Cl-1-Ar3-N=NA general formula [I"] A N=IN-ArI C11=CAR2 C=CH-
Ar3 N=N-A [wherein, Ar3: each substituted or unsubstituted carbocyclic aromatic ring group, Hl or l (2: each electron-withdrawing group, A niNH302 ((6 , Y: hydrogen atom, hydrogen atom, substituted or unsubstituted alkyl group, alkoxy group, carboxyl group, sulfo group, substituted or unsubstituted carbamoyl group, or substituted or unsubstituted sulfamoyl group, (provided that Il+ is 2 In the above cases, groups may be different from each other.) Z: Atom group necessary to constitute a substituted or un16-substituted carbocyclic aromatic ring or a substituted or unsubstituted heterocyclic aromatic ring. , R96: hydrogen atom, substituted or unsubstituted amine group, substituted or unsubstituted carbamoyl group, carboxyl group or ester group thereof, A1: substituted or unsubstituted aryl group, n: integer of 1 or 2, m: Represents an integer from 0 to 4.] General formula [111) %Formula% [In the formula, l(, 7J (8: represents a substituted or unsubstituted alkyl group, phenyl group, and substituents include an alkyl group, an alkoxy group, A phenyl group is used. R9: Represents a substituted or unsubstituted phenyl group, naphthyl group, anthryl group, fluorenyl group, or heterocyclic group, and as a substituted group, an alkyl group, an alkoxy group, a halogen atom, a hydroxyl group, or a phenyl group is used. R10"""'1+: represents a hydrogen atom, a halogen atom, an alkyl group, a 7/l/koxy group, or an alkylamino group.] General formula Cm) Ar4\N --Ar6/Ar5 [In the formula, Ar4, Ar5 : Represents a substituted or unsubstituted phenyl group, and substituents include a halogen atom, an alkyl group,
A nitro group or an alkoxy group is used (・Ar6: represents a substituted or unsubstituted phenyl group, naphthyl group, anthryl group, fluorenyl group, or heterocyclic group; substituents include an alkyl group, an alkoxy group, a halogen atom, or a hydroxyl group) , arylmexy group, aryl group, amine group, nitro group, hyperidino group, morpholino group, naphthyl group, anthryl group, and substituted amine group.However, as a substituent for the substituted amino group, acyl group, alkyl group, and aryl group are used. ,0 using an aralkyl group]