Allied Chemical Corporation

John Pisanchyn

Stylianos Sifniades

Josefina T Baker

Fred W Koff

Robert Fuhrmann

John B O'Brien

S Robert Colby

An improved process is described for preparing solutions or slurries of aromatic dicarboxylic acid chlorides in high purity, particularly terephthaloyl chloride, useful as an acylating agent for making polyesters from bisphenols, by adding an aromatic dicarboxylic acid to a liquid medium of phosgene in an inert chlorinated paraffinic hydrocarbon solvent, at a temperature of about 10.degree. to 50.degree. C, wherein at least 1.02 equivalents of a weak tertiary amine base per equivalent of carboxylic acid group is present in the reaction mixture throughout the reaction period, whereby a yield of dicarboxylic acid chloride of at least about 90% of theory, based on the total dicarboxylic acid employed in the reaction, is obtained.

Process for the manufacture of aromatic dicarboxylic acid chlorides

A method of improving the yield of plants such as legumes by the application thereto of plant growth regulants comprising nitro-oximino alkanoic acids and derivatives thereof having the general formula: ##STR1## wherein n is an integer from 1 to 12 and wherein Y is selected from the group consisting of OR, SR, NRR' in which R and R' are independently selected from the group consisting of hydrogen, alkyl, cycloalkyl, alkaryl, aralkyl, aryl, heterocyclic, alkenyl and alkynyl, and OR' in which R' is an alkali metal.

Plant growth regulants

Cyclo-olefins are converted in high yield to the corresponding chloro-nitroso dimers by dissolving the cyclo-olefin in liquid SO.sub.2 and contacting with NOCl while maintaining a substantially oxygen-free environment. Even higher yields are attained by controlling the gradual addition of the NOCl and by using a molar ratio of NOCl to cyclo-olefin of less than about 0.92:1.

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Morristown, NJ, United States of America

John Pisanchyn