Method for converting carboxylic acid groups to trichloromethyl groups
First Claim
Patent Images
1. A method for the conversion of a carboxylic acid group on the ring of an aromatic or N-heteroaromatic compound to a trichloromethyl group which comprises contacting at a temperature of from about 100°
- C. to about 250°
C. the aromatic or N-heteroaromatic compound with (i) from about 0.5 to about 2.0 molar equivalents of phenylphosphonous dichloride per carboxylic acid group to be converted, (ii) phosphorus trichloride, and (iii) chlorine;
wherein the molar ratio of chlorine to PCl3 is from about 1;
1 to about 3;
1.
2 Assignments
0 Petitions
Accused Products
Abstract
There is disclosed a method for the conversion of a carboxylic acid group on the ring of an aromatic or N-heteroaromatic compound to a trichloromethyl group which comprises contacting the aromatic or N-heteroaromatic compound with a phenylphosphonous dichloride, phosphorus trichloride and chlorine.
8 Citations
6 Claims
-
1. A method for the conversion of a carboxylic acid group on the ring of an aromatic or N-heteroaromatic compound to a trichloromethyl group which comprises contacting at a temperature of from about 100°
- C. to about 250°
C. the aromatic or N-heteroaromatic compound with (i) from about 0.5 to about 2.0 molar equivalents of phenylphosphonous dichloride per carboxylic acid group to be converted, (ii) phosphorus trichloride, and (iii) chlorine;
wherein the molar ratio of chlorine to PCl3 is from about 1;
1 to about 3;
1. - View Dependent Claims (2, 3, 4, 5, 6)
- C. to about 250°
Specification