JPS63313153A - Silver halide photographic sensitive material - Google Patents

Abstract

PURPOSE:To obtain a photosensitive material having high sensitivity, graininess, and sharpness by incorporating a coupler expressed by the specified formula into one of a photosensitive silver halide emulsion layer or a hydrophilic colloid layer formed in layers, and using flat plate silver halide particles having >=5 mean value of particle size/thickness. CONSTITUTION:A silver halide emulsion layer consisting of flat plate silver halide particles having >=5 mean value of particle size/thickness and a hydrophilic colloid layer are formed in layers on a base, and a coupler expressed by the formula is incorporated into one of the above described layers. In the formula for the coupler, R1 is CONHR4R5 group, NHCOR4 group, NHCOOR6 group, NHSO2R6 group, NHCONR4R5 group, NHSO2NR45 group; R2 is a univalent group; R3 is a substituent; X is H or a group eliminable by the reaction with an oxidized body of aromatic primary amine developing agent; l is 0.1; m is 0-3; each R4 and R5 is H, aromatic group, aliphatic group, or heterocylic group; each R3 may be different or may form a ring; each R4 and R5, R2 and R3, R3 and X may form a ring. When l is zero, m is 0 and R1 is CONHR7, and R7 is an aromatic group.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a silver halide photographic light-sensitive material, and more specifically, it has high sensitivity, excellent graininess, and sharpness, and is resistant to performance fluctuations due to changes in development processing conditions. This invention relates to an improved silver halide photographic material.

[Prior Art] In recent years, two major trends can be seen in photosensitive materials for photography due to the wide increase in photography opportunities due to the spread of compact cameras and the diversification of user needs. 1
One is the need for higher sensitivity as typified by 130100G and 1600, and the other is the demand for higher image quality for small formats, that is, higher graininess and sharpness.

In order to meet this demand, research has been carried out on silver halide emulsion technology, coupler technology, layer construction technology, etc., but the results have not been satisfactory.

On the other hand, with the spread of compact labs, short-time finishing, etc., variations in finished print quality have become apparent and have become a major problem.

[Object of the Invention] The object of the present invention is to solve the problems of the prior art described above, and to provide a silver halide photographic material that has high sensitivity, excellent graininess, and sharpness, and is less susceptible to performance fluctuations due to changes in development processing conditions. It is about providing.

[Structure of the Invention] As a result of intensive research, the object of the present invention is to provide a silver halide photographic material having at least one light-sensitive silver halide emulsion layer and at least one hydrophilic colloid layer on a support. , at least lfi of the layer contains a coupler represented by the general formula [A], and at least one layer has a particle size/
This was achieved by a silver halide photographic material containing a silver halide emulsion consisting of tabular silver halide grains having an average thickness of 5 or more.

General formula [A] R1 is -CONR, R,, -NIICOR<, -NH
COORa, -N)IsOJs, -NllCONR,R
, or -NIISOtNRJs, R2 is a monovalent group, R3
is a substituent, X is a hydrogen atom or a group that leaves by reaction with an oxidized aromatic primary amine developing agent, or 0 or 1. m
is 0 to 3, R4 and R% are hydrogen atoms, aromatic groups, aliphatic groups or heterocyclic groups, R6 is aromatic groups, aliphatic groups or heterocyclic groups, and ■ is 2 or 3. Then, each R3 may be the same or different, and may be bonded to each other to form a ring, and R4, Rs-Rx and R3, and R2 and X may be bonded to form a ring, provided that , when the sentence is 0, the wealth is 0, and R1 is -CONHR? There is Te, R? represents an aromatic group.

Each group represented by R2-R7 includes those having a substituent.

R6 is an aliphatic group having 1 to 30 carbon atoms, and 6 to 3 carbon atoms;
0 aromatic group and a heterocyclic group having 1 to 30 carbon atoms are preferred, and R4 and US are preferably hydrogen atoms and Rt, as well as those listed as preferred.

R2 is a hydrogen atom bonded to 811 directly or via NH, CO or SO2, an aliphatic group having 1 to 30 carbon atoms, an aromatic group having 6 to 30 carbon atoms, or a heterocyclic group having 1 to 30 carbon atoms. , -OR,, -CUR.

-PG+ORI. )2, -PMR,. )* , -Co
□R8゜, -SO□R3゜ or -8O□OR+o(”
a, R9 and R1° are the above R4, R% and R, respectively.
6, and R6 and R9 may be combined to form a heterocycle) is preferred.

R? is preferably an aromatic group having 6 to 3 carbon atoms,
Typical examples of substituents for Rt include halogen atom, hydroxy group, amino group, carboxyl group, sulfonic acid group, cyano group, aromatic group, heterocyclic group, carbonamide group, sulfonamide group, carbamoyl group, sulfamoyl group, Ureido group, acyl group, acyloxy group, aliphatic oxy group, aromatic oxy group, aliphatic thio group, aromatic thio group, aliphatic sulfonyl group, aromatic sulfonyl group, sulfamoylamino group, nitro group, imide group , an aliphatic group, an aliphatic oxycarbonyl group, and the like. When substituted with a plurality of substituents, the plurality of substituents may be bonded to each other to form a ring, such as a dioxymethylene group.

Typical examples of R3 include halogen atom, hydroxy group, amino group, carboxyl group, sulfonic acid group, cyano group, aromatic group, heterocyclic group, carbonamide group, sulfonamide group, carbamoyl group, sulfamoyl group, ureido group, Examples include acyl group, acyloxy group, aliphatic oxy group, aromatic oxy group, aliphatic thio group, aromatic thio group, aliphatic sulfonyl group, aromatic sulfonyl group, sulfamoylamino group, nitro group, imide group, etc. Can - this R1
The number of carbon atoms contained in is preferably θ to 30. When +s=2, an example of cyclic R3 is a dioxymethylene group.

When the sentence is 1, R, is particularly preferably -CONRJs,
聁 is preferably 0, and R2 is directly bonded to Nl+ -C
OR,, -C00R,0, -3OJ+o, -CONR,
R,,-3O2NRaRs are particularly preferred, and even more preferred is -COOR, which binds directly to Nil. , -CO
Ra, -SO□R□. Among others, -COOR. is most preferred.

Also included in the present invention are those that form dimers or more multimers via R1 to R3 and X.

Among the general formulas [A], the case where sentence=0 is preferable.

A specific example of the coupler represented by the general formula [A] is JP-A-60
-237448, 61-153640, 61-
No. 145557, No. 62-85242, No. 48-15
No. 529, No. 5o-117422, No. 52-1831
No. 5, No. 52-90932, No. 53-52423,
No. 54-48237, No. 54-66129, No. 55
-32071, 55-65957, ss-i
.

No. 5226, No. 56-1938, No. 56-12643
No. 56-27147, No. 56-126832,
No. 58-95346 and U.S. Patent: l, 488,19
No. 3, etc., and can be synthesized by the methods described therein.

Depending on the physical properties (e.g. solubility) of the coupler, the coupler can be added to the photosensitive material using an oil-in-ice emulsion dispersion method using a water-insoluble high-boiling organic solvent, an alkaline dispersion method where the coupler is added as an alkaline solution, or a latex dispersion method. Various methods can be used, such as a solid dispersion method in which a fine solid is added directly.

The amount of coupler added is usually per mole of silver halide.1.
Ox 10-” mol-1,0 mol, preferably 5.0×
8. to 10-3 moles. Ox is in the range of 10-' moles.

Next, typical examples of the coupler represented by the general formula [A] will be shown, but the present invention is not limited thereto.

The following is a cold white [Exemplary compound] CIIICO)Ill CII3SO,N11 A-5 Δ-6 C9JIssSOJ11 Δ-Y [(i) CslltlJSOJIl 1l CIIsSOJII 0CutC11*5Os) Ia
H C, II, 0COIIH C1゜IIt+0CON11 L:l13(LυTodoro U Cg A-1?il A-21011 CIIsSOtNII A-23011 &, 11.Rishiυ1111 A-25011 CF,CON+1 0(C!1.) @5CIICO,l
Book I C++*lbi il C21110CON11 x: y Tatsumi 60: 4G (molar ratio) N

Nkukuzu CII*CIb5CHtCIItCOdlOd1 CIItC! Silver halide emulsion of the present invention contains tabular silver halide grains having an average value of 2 grain diameter/thickness, that is, an average aspect ratio of 5 or more.The diameter of a silver halide grain is a circle with an area equal to the projected area of the grain. Say the diameter of 9
In the present invention, the thickness of a silver halide grain is defined as the minimum distance between two parallel planes constituting a tabular silver halide grain. The preferred aspect ratio of the silver halide emulsion of the present invention is It is 6 or more and 100 or less, more preferably 7 or more and 50 or less, particularly preferably 8 or more and 21 or less.

The average thickness of the silver halide grains contained in the tabular silver halide emulsion of the present invention is preferably from 0.5 to 0.01, particularly preferably from 0.3 to 0.05.

The average grain size of the silver halide grains contained in the tabular silver halide emulsion of the present invention is 0.5 to 30 mm, more preferably 1.0 to 20 mm.

In the tabular silver halide emulsion of the present invention, the silver iodobromide is preferably silver chloroiodobromide.

Tabular silver halide emulsions are disclosed in JP-A Nos. 52-153428, 54-155827, 54-118823,
It can be obtained by a known method disclosed in JP 58-127921, JP 58-113-928, and the like.

In the tabular halide emulsion of the present invention, silver iodide is preferably localized in the center of the silver iodobromide grains.

The high iodine content phase (or layer) in the center preferably accounts for 80% or less of the total volume of the grain, particularly preferably 60% to 10%.

The silver iodide content in the center is preferably 5 to 40 mol%, particularly preferably 10 to 30 mol%.

The low iodine content phase (periphery) surrounding the central high iodine content phase (or layer) has an iodine content of 0 to 10 mol%, more preferably 0.1 to 6.0 mol%. Preferably, it consists of silver bromide.

A tabular silver halide emulsion in which silver iodide is localized in the center can be obtained by a known method such as that disclosed in JP-A-59-99433.

The average silver iodide content of the tabular silver halide emulsion of the present invention is preferably 3 to 20 mol%, more preferably 4 to 15 mol%, particularly preferably 6 to 12 mol%.
It is.

In a tabular silver halide emulsion with undeveloped tJ1, the silver iodide content in the center and peripheral areas is preferably 4 times or more, particularly preferably 5 times or more.

The halogen composition at the boundary between the center and the periphery may vary continuously or may have a clear boundary.

In the layer containing the tabular silver halide emulsion of the present invention, the tabular grains are present in an amount of 1lff with respect to all the silver halide grains in the layer.
It is preferable that the i ratio is 40% or more, particularly 60% or more.

As a method for confirming the intragrain halogen composition structure of the silver halide grains of the present invention, J.], Goldstein (Gol.
dstein), D. B. Williams (Wi
lliams) r X-ray analysis in TEM/ATEM” Scanning Electron Microscope (
1977), Volume 1 (IIT Research Institute, Page 651 (March 1977)), the particles to be examined are placed on a grid and cooled to the temperature of liquid nitrogen. A focused V-me of electrons is applied to a 0.27 micrometer spot on each particle to be examined.The sample is examined at an accelerating voltage of 75 kilovolts.The intensity and energy of the x-rays produced by the electron beam By measuring , it is possible to measure the ratio of iodide and bromide in the particle at the spot hit by the electron.

The silver halide grains used in the silver halide emulsion of the present invention may be obtained by any of the acid method, neutral method, ammonia method, etc. The grains may be grown temporarily,
The seed particles may be grown after they are created. The method of creating and growing the seed particles may be the same or different.

In the silver halide emulsion of the present invention, halide ions and silver ions may be mixed simultaneously or one may be mixed in a solution in which the other is present, and the critical growth rate of silver halide crystals may be Taking this into account, it is also possible to generate halide ions and silver ions by sequentially and simultaneously adding them while controlling the pH and p/kg in the mixing pot. This method produces crystals with a regular crystal shape and a small particle size. Almost uniform silver halide grains are obtained. At any step in the formation of AgX, conversion methods may be used to change the halogen composition of the particles.

Known silver halide solvents such as ammonia, thioether, thiourea, etc. can be present during the growth of the silver halide grains of the present invention.

The uninvented silver halide grains contain cadmium salts, zinc salts, lead salts, thallium salts, iridium salts (including complex salts), rhodium salts (including complex salts) during the process of grain formation and/or growth. ) and iron salts (including complex salts) to contain these metal elements inside the particles and/or on the surface of the particles, and in an appropriate reducing atmosphere. By leaving the particles in place, reduction sensitizing nuclei can be provided inside the particles and/or on the particle surfaces.

In the silver halide emulsion of the present invention, unnecessary soluble salts may be removed after the growth of silver halide grains is completed, or they may be left in the silver halide emulsion. Roger (Re5earch
Disclosure (hereinafter abbreviated as RD) 1764
This can be carried out based on the method described in Item 3 (■).

Other silver halide emulsions may have a uniform silver halide composition distribution within the grain, or may be core/shell grains in which the silver halide composition differs between the grain interior and the surface layer.

Other silver halide grains may have a regular crystal shape such as a cube, octahedron, or dodecahedron, or may have an irregular crystal shape such as a spherical shape or a plate shape. In these particles, any ratio of the (100) plane to the (111) plane can be used. Further, the particles may have a composite form of these crystal forms, or particles of various crystal forms may be mixed.

The size of silver halide grains is 0.05 to 10.0
1, preferably 0.1 to 5. Orl can be used.

Other silver halide emulsions may have any grain size distribution. Emulsions with a wide grain size distribution (referred to as polydisperse emulsions) or emulsions with a narrow grain size distribution (monodisperse emulsions) may be used. It is called a dispersed emulsion.The monodispersed emulsion referred to here refers to one in which the standard deviation of the grain size distribution divided by the average grain size is 0.20 or less, where the grain size is spherical. In the case of silver halide, the diameter is shown, and in the case of particles with a shape other than spherical, the diameter when the projected image is converted to a circular image of the same area) may be used alone or in combination of several types. Further, a mixture of a polydisperse emulsion and a monodisperse emulsion may be used.

The silver halide emulsion may be a mixture of two or more separately formed silver halide emulsions.

In the present invention, it is preferable that at least both the coupler of the general formula [A] and the tabular grains having an aspect ratio of 5 or more are contained in the silver halide emulsion layer.

The emulsion can be chemically sensitized by conventional methods, and can be optically sensitized to a desired wavelength range using a sensitizing dye.

Antifoggants, stabilizers, etc. can be added to the silver halide emulsion. Gelatin is advantageously used as binder for the emulsion.

The emulsion layer and other hydrophilic colloid layers can be hardened and can contain a plasticizer and a dispersion (latex) of a water-insoluble or sparingly soluble synthetic polymer.

A coupler is used in the emulsion layer of a light-sensitive material for color photography.

Furthermore, by coupling with a colored coupler having a color correction effect, a competitive coupler, and an oxidized form of a developing agent, a development accelerator, a bleach accelerator, a developer, a silver halide solvent, a toning agent, a hardening agent, Compounds that release photographically useful fragments such as fogging agents, antifoggants, chemical sensitizers, spectral sensitizers, and desensitizers can be used.

The photosensitive material can be provided with auxiliary layers such as a filter layer, an antihalation layer, and an antiirradiation layer. These layers and/or the emulsion layer may contain dyes that are washed out or bleached from the light-sensitive material during development.

A formalin scavenger-1 fluorescent whitening agent, a matting agent, a lubricant, an image stabilizer, a surfactant, a color fog preventive agent, a development accelerator, a development retarder, and a bleach accelerator can be added to the photosensitive material.

As a support, paper laminated with polyethylene, etc.
Polyethylene terephthalate film, baryta paper, cellulose triacetate film, etc. can be used.

To obtain a dye image using the photosensitive material of the present invention, after exposure,
Commonly known color photographic processing can be performed.

[Examples] Specific examples of the present invention will be described below, but the embodiments of the present invention are not limited thereto.

In all of the following examples, the amount added in the silver halide photographic light-sensitive material is 1r! unless otherwise specified. Figures are shown per 1", and silver halide and colloidal silver are shown in terms of silver.

A multilayer color photographic material (Sample 1) was prepared by sequentially forming each layer having the composition shown below on a triacetyl cellulose film support from the support side.

Sample 1 (comparison) 1st R: Antihalation layer (IIc-1) Gelatin layer containing black colloidal silver.

2nd Layer: Intermediate Layer (1,L,) Gelatin layer containing an emulsified dispersion of 2.5-di-t-octylhydroquinone.

3rd layer: low-sensitivity red-sensitive silver halide emulsion layer (RL-1) average grain size (r') 0.40μ■, AgBr1 containing 6 mol% Agl (chemically sensitized Em-1 shown in Table 1) ) Monodispersed emulsion (emulsion 1'') -- Silver coating amount 1,8g
/m'sensitizing dye I --- 5.0% per mole of silver. Ox 1
0-'Mole sensitizing dye ■...0.8X per mole of silver
10-'Morsian coupler (C-1)... 0.085 mol per mol of silver Colored cyan coupler (CC-1)... 00005 mol per mol of silver DIR compound (D-1) ... 0.0015 mol per mol of silver DIR compound CD-2) 0.002 mol per mol of silver 4th layer: Highly sensitive red-sensitive silver halide emulsion layer (R)! -1
) Average particle size < r > 0.81 L■, AgBr1 containing 6 mol% Agl (chemically sensitized Em shown in Table 1)
-6) Monodispersed emulsion (emulsion n) - silver coating amount 1. :1g/m''
Sensitizing dye I: 2.0% per mole of silver. SX 10-'
Molar sensitizing dye■...0.8X per mole of silver 10
-'Morsian coupler (c-i)...0.034 mol per mol of silver Colored cyan coupler (CC-1)...0.0015 mol DIR compound (T2) per 1 mol of silver ... 0.001 mol per mol of silver 5th layer: Intermediate layer (+, L,) Same as the 2nd layer, gelatin layer.

6th layer: Low-sensitivity green-sensitive silver halide emulsion layer (GL-1) Emulsion-I-... Silver coating amount 1.5 g/rn' sensitizing dye m.
...2.0 per mole of silver. OX 10-' mol Sensitizing dye ■...1. OX 10-' mol Magenta coupler (T1)...0.090 mol per 1 mol of silver Colored magenta coupler (CM-1)...0.004 mol DIR compound (D- 1)--0.0010 mol per 1 mol of silver DIR compound (D-3) 0.0030 mol per 1 mol of silver 7th F3 = High-sensitivity green-sensitive silver halide emulsion layer (GH- 1
) Emulsion -■...Amount of silver coated 1.4g/Gold sensitizing dye m...1.2X 10-' per mole of silver
Molar sensitizing dye ■...0.8x 10 per mole of silver
-'mol magenta coupler (M-1)--0.015 mol per mol of silver Colored magenta coupler (CM-1)...G, (102 mol per mol of silver) DIR compound (D- 3) - 0.0010 mol per mol of silver 8th layer: Yellow filter single layer (YC-1) Gelatin containing negative color colloidal silver and emulsified dispersion of 2,5-di-t-octylhydroquinone layer.

9th layer: Low-sensitivity green-sensitive silver halide emulsion layer (BL-1) Ag containing average grain size 0.48, Agl LO mol%
Monodispersed emulsion (emulsion ■) consisting of Br1...silver coating amount 0.9 g/rn'
Sensitizing dye V...1.3X 10-' per mole of silver
Mol yellow coupler (Y-1)... 0.29 mole per mole of silver, 1st theta layer: Highly sensitive blue-sensitive silver halide emulsion layer (B11-
1) AgB containing 7 mol% Agl with an average particle size of 0.8 mol%
Monodisperse emulsion consisting of r1 (emulsion IV) - silver coating amount 0.5 g/rn
'Sensitizing dye V: 1.0% per mole of silver. OX 10-
'Mole Yellow coupler (Y-1)... 0.08 mol per mol of silver DIR compound (D-2)... 0.0030 mol per mol of silver 11th layer: 1st protective layer (Pro-1) Silver iodobromide (8g 11 mol%, average particle size 0.07μ layer) Silver coating amount 0.5g/m'' Gelatin layer containing ultraviolet absorbers UV-I and UV-2.

12th), J'': Gelatin layer containing second protected f3 (Pro-2) polymethyl methacrylate particles (diameter 1.5 pots 11).

In addition to the above composition, each layer contains a gelatin hardening agent (T1).
and (G2) and a surfactant were added.

The compounds contained in each layer of sample 1 are as follows.

Sensitizing dye I: anhydro-5,5'-dichloro-9-ethyl-3,3'-di(3-sulfopropyl)thiacarbocyanine hydroxide sensitizing dye ■; anhydro-9-ethyl-3,3'- Di(3-sulfopropyl)-4,S,4',5'-dibenzothiacarbocyanine hydroxide sensitizing dye m: anhydride-5,5'-diphenyl-9-
Ethyl-3,3′-di(3-sulfopropyl)oxacarbocyanine hydroxide sensitizing dye Dibenzoxacarbocyanine hydroxide sensitizing dye V: anhydro-3,3'-di(3-sulfopropyl)-4,5-benzo-5'-methoxythiacyanine anhydroxide T4 C*Fh C-1 0 Ura CM-1 UV-2 ((CH1=CH3OIC)If)3CCH,SO2(
CHffi)t)tN(CBx)tsOJ Sample No. 1 prepared in this manner was exposed to white light and then subjected to the following development treatment.

Processing process (38℃) Color development 3 minutes 15 seconds bleaching 6 minutes 30 seconds washing with water 3 minutes 15 seconds fixing 6 minutes 30 seconds washing with water
, Stabilization for 3 minutes and 15 seconds, Drying for 1 minute and 30 seconds. The composition of the treatment liquid used in each treatment step is as follows.

[Color developer] 4-amino-3-methyl-N-ethyl-N-(β-hydroxyethyl)-aniline sulfate 4.75g anhydrous sodium sulfite 4.25g hydroxylamine H sulfate 2.0g anhydrous carbonate potassium
37.5g sodium bromide
1.3g nitrilotriacetic acid trisodium salt (l hydrate) 2.5g potassium hydroxide 1.0g Add water to 1
Let it be a sentence.

[Bleach solution] Ethylenediaminetetraacetic acid iron ammonium salt 100.0g Ethylenediaminetetraacetic acid diammonium salt 10.0g Ammonium bromide 150.0g Glacial acetic acid
Add 10.0m water to make 1X, and adjust the pH to 0 using ammonia water.

[Fixer] Ammonium thiosulfate 175.0g Anhydrous sodium sulfite 8.5g Sodium metasulfite 2.3g Add water and IJI
and adjust the pH to -6.0 using acetic acid.

[Stabilizing solution] Formalin (37% aqueous solution) 1. Sm
Bunconidax (manufactured by Konishiroku Photo Industry Co., Ltd.) Add 7.5 ounces of water to make 1 sentence.

Samples No. 2 to IO were prepared by changing only the silver halide emulsion and one type of coupler to Sample I as shown in Table 2, and were exposed to white light and developed in the same manner as Sample No. 1.

Sensitometry shown in Table 3 was performed on samples Nos. 1 to 10.

Table 1 Table 2 Table 3 *1 Phase relative change is the relative value of the reciprocal of the exposure amount that gives fog density +0.1.

*2 Relative granularity is the relative value of 1000 times the standard deviation of the variation in c degree value that occurs when the minimum density + 0.2 density is scanned with an aperture scanning area of 250 hours rn' microdensitometer. .

*3 Process A is a process in which the color development time is shortened to 2 minutes and 40 seconds.

*4 Process B is a process in which the bleaching time is shortened to 5 minutes and 30 seconds.

As shown in Table 3, the results of the present invention were better than expected, with high sensitivity and excellent graininess, and less sensitivity to changes in development and bleaching processing steps.

Patent applicant Roku Konishi Photo Industry Co., Ltd. Agent Patent attorney Nobuaki Sakaguchi Procedure-7113'XE Free (voluntary) October 13, 1985

Claims (1)

[Scope of Claims] A silver halide photographic material having at least one photosensitive silver halide emulsion layer and at least one hydrophilic colloid layer on a support, at least one of the layers having the general formula A silver halide emulsion containing a coupler represented by [A] and at least one layer comprising tabular silver halide grains having an average grain size/thickness of 5 or more. Photographic material. General formula [A] ▲There are mathematical formulas, chemical formulas, tables, etc.▼ R_1 is -CONR_4R_5, -NHCOR_4, -
NHCOOR_6, -NHSO_2R_8, -NHCO
NR_4_R_5 or -NHSO_2NR_4R_5,
R_2 is a monovalent group; R_3 is a substituent; hydrogen atom, aromatic group, aliphatic group or heterocyclic group, R_6 represents an aromatic group, aliphatic group or heterocyclic group, m is 2
or 3, each R_3 may be the same or different, may be combined with each other to form a ring, or R_4 and R_5, R
_2 and R_3, and R_2 and X may be combined to form a ring. However, when l is 0, m is 0, and R_1 is -CONR_
7, and R_7 represents an aromatic group.