Wallace T Fu

US Patent:

46395369, Jan 27, 1987

Filed:

Aug 30, 1984

Appl. No.:

6/645714

Inventors:

Constance A. Fellows - Durham NC
Wallace Y. Fu - Chapel Hill NC

Assignee:

Union Carbide Corporation - Danbury CT

International Classification:

C07D30786
C07C 4323

US Classification:

549462

Abstract:

2,3-Dihydro-2,2-dimethyl-7-hydroxybenzofuran is prepared by reacting catechol with isobutylene oxide or with a compound having the general formula ##STR1## wherein R is halogen or hydroxyl, and X is halogen, in the presence of a base to form the intermediate 2-(2-hydroxy-2-methylpropoxy) phenol and then thermally dehydrating, rearranging and cyclizing the resulting intermediate phenol in the presence of an acid catalyst to form 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran.

US Patent:

44950934, Jan 22, 1985

Filed:

Apr 15, 1982

Appl. No.:

6/368639

Inventors:

Wallace Y. Fu - Chapel Hill NC

Assignee:

Union Carbide Corporation - Danbury CT

International Classification:

C07C10312

US Classification:

2604533

Abstract:

An improved method for the preparation of stable, thiobiscarbamates in high yields and high purity is provided which involves the in situ reaction of a carbamate with a sulfur chloride in the presence of a nitrogen-containing heterocyclic base and thereafter quenching and washing the reaction slurry with an alcohol at low temperatures.