Patents by Inventor Carl A. Bryan, Jr.

Carl A. Bryan, Jr. has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for the preparation of stilbenedicarboxylate esters
    Patent number: 5473098
    Abstract: Disclosed is a process for the preparation of 4,4'-stilbenedicarboxylate esters by a 4-step process starting with an alkyl p-formylbenzoate and utilizing intermediate phosphite and phosphonate compounds. The steps comprise(1) preparing an alkyl p-(hydroxymethyl)benzoate by hydrogenating an alkyl p-formylbenzoate;(2) contacting the alkyl p-(hydroxymethyl)benzoate of step (1) with a trialkyl phosphite to obtain a phosphite ester compound having the formula: ##STR1## (3) contacting the phosphite ester of step (2) with a catalytic amount of iodine to rearrange the phosphite ester to the corresponding phosphonate ester;and(4) contacting the phosphonate ester compound of step (3) with an alkyl p-formylbenzoate in the presence of an alkali metal alkoxide and an inert solvent to obtain the dialkyl 4,4'-stilbenedicarboxylate.
    Type: Grant
    Filed: March 6, 1995
    Date of Patent: December 5, 1995
    Assignee: Eastman Chemical Company
    Inventors: Richard H. S. Wang, Carl A. Bryan, Jr., Bill A. Eller