| 摘要 |
1363916 Percarboxylic acids BAYER AG 29 July 1971 [1 Aug 1970] 35735/71 Heading C2C A percarboxylic acid or a solution thereof is prepared by reacting a carboxylic acid or anhydride with dilute aqueous hydrogen peroxide containing a phosphorus compound of the formula wherein, X, Y, Z may be the same or different and represent an oxygen group, an N-C 1 -C 6 alkyl, or an N-C 4 -C 7 cycloalkyl group, m, n and p represent 0 or 1, R 1 , R 2 , R 3 which may be the same or different represent straight chain or branched C 1 -C 6 alkyl, or C 4 -C 6 cycloalkyl optionally substituted with halogen, OH-, C 1 -C 4 alkoxy, CN, or phenyl; or one or more of R 1 , R 2 , R 3 may represent phenyl radical optionally substituted with halogen, OH, C 1 -C 4 alkyl, C 1 -C 4 alkoxy, carbo-C 1 -C 3 alkoxy or CN; R 1 together with R 2 or R 1 together with R 3 or R 2 together with R 3 may represent an alkylene radical so that either a 5- to 7-membered heterocyclic ring which contains 3 hetero atoms or a 5- to 7- membered ring which contains phorphorus, and optionally an inert diluent. The water present is optionally removed partially or completely and the mixture is reacted with the carboxylic acid and/or anhydride at from - 20 to 100‹ C. and the water removed and the product isolated. Examples describe the perparation of peracetic and perpropionic acids in the presence of dimethyl ester of methane phosphonic acid, #-cyanoethyl phosphonic acid, triethyl phosphate, hexamethyl phosphonic acid triamide, tetramethyl methane phosphonic acid diamide, 1-methyl-1-oxophospholane, and 1 -methoxy- 1 - oxophospholane. Lists of suitable phosphorus compounds are included. |
