Method for preparing 1-aryl-3-arylamino-2-pyrazolin-5-ones from
申请人:Eastman Kodak Company
公开号:US04374253A1
公开(公告)日:1983-02-15
A method for preparing a 1-aryl-3-arylamino-2-pyrazolin-5-one comprises reacting an N-aryl-3-arylamino-3-oximinopropionamide with an acylating agent in an inert solvent, then heating in contact with a strong acid catalyst and a dehydrating agent in an inert solvent, and then heating in contact with an acid in water and a lower alkanol.
Photographic elements containing ballasted couplers
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0073636A1
公开(公告)日:1983-03-09
A photographic element comprising a support, a photographic silver halide emulsion and a nondiftusible photographic coupler, characterized in that said coupler contains attached to a position other than the coupling position a ballast terminated with a hydroxyphenylsulfonyl group o: a hydroxypnanylsulfinyl group.
A method for preparing 1-aryl-3-arylamino-2-pyrazolin-5-ones
申请人:EASTMAN KODAK COMPANY
(a New Jersey corporation)
公开号:EP0076212A2
公开(公告)日:1983-04-06
A method for preparing a 1-aryl-3-arylamino-2-pyrazolin-5-one comprises reacting an N-aryl-3-arylamino-3- oximinopropionamide with an acylating agent in an inert solvent, then heating in contact with a strong acid catalyst and a dehydrating agent in an inert solvent, and then heating in contact with an acid in water and a lower alkanol. The 1-aryl-3-arylamino-2-pyrazolin-5-one may be used as a color-forming coupler or as an intermediate in preparing a color-forming coupler which produces a dye in a photographic element.
Verfahren zur Herstellung von haloaromatischen Aminen durch katalytische Hydrierung der entsprechenden halonitroaromatischen Verbindungen, dadurch gekennzeichnet, daß man als Katalysator eisenhaltigen Raney-Nickel einsetzt, wobei die hergestellten haloaromatischen Amine zur Synthese von photographischen Kupplern, nutzbar in photographischen Emulsionen oder Elementen, eingesetzt werden können.