GB796873A - Improvements in or relating to photographic emulsions - Google Patents

Improvements in or relating to photographic emulsions

Info

Publication number
GB796873A
GB796873A GB35797/54A GB3579754A GB796873A GB 796873 A GB796873 A GB 796873A GB 35797/54 A GB35797/54 A GB 35797/54A GB 3579754 A GB3579754 A GB 3579754A GB 796873 A GB796873 A GB 796873A
Authority
GB
United Kingdom
Prior art keywords
nitrophenyl
prepared
dinitro
dihydrazino
methyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB35797/54A
Inventor
Paul Desire Van Pee
Laurent Pierre Roosens
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Gevaert Photo Producten NV
Original Assignee
Gevaert Photo Producten NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to BE543288D priority Critical patent/BE543288A/xx
Application filed by Gevaert Photo Producten NV filed Critical Gevaert Photo Producten NV
Priority to GB35797/54A priority patent/GB796873A/en
Priority to US551458A priority patent/US2901351A/en
Priority to FR1136718D priority patent/FR1136718A/en
Priority to DEG18553A priority patent/DE1019171B/en
Publication of GB796873A publication Critical patent/GB796873A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C07—ORGANIC CHEMISTRY
    • C07D—HETEROCYCLIC COMPOUNDS
    • C07D239/00—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings
    • C07D239/02—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings
    • C07D239/20—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having two double bonds between ring members or between ring members and non-ring members
    • C07D239/22—Heterocyclic compounds containing 1,3-diazine or hydrogenated 1,3-diazine rings not condensed with other rings having two double bonds between ring members or between ring members and non-ring members with hetero atoms directly attached to ring carbon atoms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
    • G03C1/00—Photosensitive materials
    • G03C1/005—Silver halide emulsions; Preparation thereof; Physical treatment thereof; Incorporation of additives therein
    • G03C1/485—Direct positive emulsions
    • G03C1/48592—Positive image obtained by various effects other than photohole bleaching or internal image desensitisation, e.g. Sabatier, Clayden effect

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Silver Salt Photography Or Processing Solution Therefor (AREA)

Abstract

<FORM:0796873/IV (b)/1> <FORM:0796873/IV (b)/2> 1 - (p - Nitrophenyl) - 2 - mercapto - 4 : 4 : 6-trimethyldihydropyrimidine is prepared by refluxing 2 - methyl - 2 - thiocyano - 4 - pentanone and p-nitro-aniline in ethyl alcohol. The corresponding 1 - (2 : 4 - dinitroanilino) - and 1 - (2 : 4 : 6 - trinitro - anilino) - derivatives are prepared similarly, using 2 : 4-dinitro- or 2 : 4 : 6-trinitrophenylhydrazines. Compounds corresponding to Figs. VIII and X are prepared by heating 2 - methyl - 2 - thiocyano - 4 - pentanone with 4 : 41 - dihydrazino - 3 : 31 - dinitrodiphenyl sulphone or with 1 : 3-dinitro-4 : 6-dihydrazino-benzene respectively. 1 - (p - Nitrophenyl) - 2 - mercapto - 4 - phenyl-6 - hydroxy - dihydropyrimidine is prepared by stirring b -amino-hydrocinnamic acid dissolved in aqueous sodium hydroxide with an acetone solution of p-nitrophenyl-isothiocyanate, and cyclizing the N-(p-nitrophenyl)-N1-(a -phenyl-b - carboxy - ethyl) - thiourea formed by treatment with hydrochloric acid. The corresponding 4-methyl-dihydropyrimidine is similarly prepared by heating b -amino-butyric acid nitrile and p-nitrophenyl-isothiocyanate in benzene and treating the N-(p-nitrophenyl)-N1-(cyanoisopropyl) thiourea formed with hydrochloric acid. 4 : 41 - Dihydrazino - 3 : 31 - dinitro - diphenylsulphone is prepared by nitrating 4 : 41-difluorodiphenyl-sulphone with conc. nitric and sulphuric acids, and adding hydrazine hydrate to the 4 : 41 - difluoro - 3 : 31 - dinitro-diphenylsulphone formed. Specifications 707,704, [Group XX], and 753,434 are referred to.
GB35797/54A 1954-12-10 1954-12-10 Improvements in or relating to photographic emulsions Expired GB796873A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
BE543288D BE543288A (en) 1954-12-10
GB35797/54A GB796873A (en) 1954-12-10 1954-12-10 Improvements in or relating to photographic emulsions
US551458A US2901351A (en) 1954-12-10 1955-12-06 Direct positive photographic material
FR1136718D FR1136718A (en) 1954-12-10 1955-12-09 Process for the production of direct positive photographic emulsions
DEG18553A DE1019171B (en) 1954-12-10 1955-12-09 Process for the production of direct positive photosensitive material

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35797/54A GB796873A (en) 1954-12-10 1954-12-10 Improvements in or relating to photographic emulsions

Publications (1)

Publication Number Publication Date
GB796873A true GB796873A (en) 1958-06-18

Family

ID=10381638

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35797/54A Expired GB796873A (en) 1954-12-10 1954-12-10 Improvements in or relating to photographic emulsions

Country Status (5)

Country Link
US (1) US2901351A (en)
BE (1) BE543288A (en)
DE (1) DE1019171B (en)
FR (1) FR1136718A (en)
GB (1) GB796873A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519428A (en) * 1965-05-21 1970-07-07 Keuffel & Esser Co Direct-positive light-sensitive photographic material

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE576568A (en) * 1958-03-11
BE608384A (en) * 1960-09-24
US3148066A (en) * 1961-06-29 1964-09-08 Eastman Kodak Co Nitramino and nitrosamino compounds as antifoggants for photographic emulsions
US3367779A (en) * 1965-01-21 1968-02-06 Fuji Photo Film Co Ltd Direct positive silver halide photographic materials
DE1937049A1 (en) * 1968-07-23 1970-02-19 Fuji Photo Film Co Ltd Process for the treatment of silver halide photographic photosensitive elements
GB1323111A (en) * 1970-04-01 1973-07-11 Agfa Gevaert Photographic direct positive silver halide material
BE785847A (en) * 1971-07-30 1973-01-05 Agfa Gevaert Nv DIRECT-POSITIVE SILVER HALOGENIDE EMULSIONS WITH DYE FORMERS
JPS4984639A (en) * 1972-12-19 1974-08-14

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB601824A (en) * 1945-10-04 1948-05-13 Elliott & Sons Ltd Improvements in photographic light sensitive emulsions
DE685901C (en) * 1935-08-31 1939-12-28 I G Farbenindustrie Akt Ges Process for fine grain development
US2173628A (en) * 1936-11-07 1939-09-19 Ilford Ltd Stabilization of photographic sensitive materials
GB508073A (en) * 1937-12-22 1939-06-22 John David Kendall Improvements in or relating to the stabilisation of photographic emulsions
GB707704A (en) * 1952-03-20 1954-04-21 Ilford Ltd Improvements in or relating to direct positive photographic emulsions

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3519428A (en) * 1965-05-21 1970-07-07 Keuffel & Esser Co Direct-positive light-sensitive photographic material

Also Published As

Publication number Publication date
US2901351A (en) 1959-08-25
FR1136718A (en) 1957-05-17
BE543288A (en)
DE1019171B (en) 1957-11-07

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