Alpha-HYDROXY, alpha-SUBSTITUTED METHYLENEBISPHOSPHONATES AND PHOSPHONOACETATES
申请人:McKenna Charles E.
公开号:US20080200679A1
公开(公告)日:2008-08-21
The present invention relates to a method for preparing α-hydroxy, α-substituted methylenebisphosphonates and phosphonoacetates via addition of Grignard or organoindium reagents to tetraalkyl carbonylbisphosphonates and trialkyl carbonylphosphonoacetates. Also disclosed are compounds so synthesized.
various carboxylic acids, a one-pot procedure for the synthesis of the corresponding 1-hydroxy-1,1-bis(phosphonic acid)s is reported. The efficiency of this simple methodology is illustrated by synthesizing well-known marketable amino hydroxy bis(phosphonate)s such as alendronate or N-methyl pamidronate without additional steps for the protection/deprotection of the amine function.
A simple and efficientone-pot procedure for synthesis of 1-hydroxymethylene-1,1-bisphosphonic acids by reaction of acyl chlorides and tris(trimethylsilyl)phosphite is described. This method was applied to the synthesis of new phosphonated chelating tripod ligands.
Stabilised peroxide bleaching solutions and their use for processing of photographic elements
申请人:EASTMAN KODAK COMPANY
公开号:EP0738919A2
公开(公告)日:1996-10-23
Color photographic elements are bleached after exposure and development by using a hydrogen peroxide bleaching solution. This solution comprises a hydrogen peroxide bleaching agent, chloride ions in an amount of at least 0.35 mol/l, a first acidic compound which is an organic phosphonic acid or a salt thereof, and a second acidic compound which is either a 2-pyridinecarboxylic acid or 2,6-pyridinedicarboxylic acid (or a salt thereof), or a polyaminocarboxylic acid having one or more secondary amines at a pH of 8 to 11 (or a salt thereof). The bleaching solution is stabilized by the presence of the two acidic compounds.
There is provided a detergent composition comprising a cationic ester surfactant and an organo diphosphonic acid crystal growth inhibitor component or its salts or complexes, which provide effective soil removal and fabric care.