Eastman-kodak Company

Joseph S Bowers, Jr

Bruce L Gustafson

Dale E Van Sickle

Carl M Lentz

Ronald J Maner

Dah-Chieh O Cheng

Gerald L Mayberry

Disclosed is a process for the preparation of stilbene compounds such as bis(2-benzoxazolyl) stilbenes by reacting a stilbenedicarboxylate such as dimethyl-4,4'-stilbenedicarboxylate with an o-aminophenol in an organic solvent such as chloronaphthalene in the presence of a catalytic amount of a tin or titanium compound. The reaction is typically carried out at a temperature of about 200.degree.-250.degree. C. and a preferred catalyst is either dibutyl tin oxide or titanium tetra-alkoxide.

Process for the preparation of stilbene derivatives

Process is disclosed for the preparation of phenylhydroquinones by the alkylation of hydroquinone (or derivatives thereof) with the cyclohexyl moieties, cyclohexanol or cyclohexene (or derivatives thereof), followed by dehydrogenation of the intermediate cyclohexylhydroquinone.

Synthesis of phenylhydroquinones

Disclosed is a process for preparing 2,2,4-trimethyl-1,2-dihydroquinoline compounds by reacting acetone with an aniline compound in the presence of a strongly acidic sulfonic acid-type macroreticular cation exchange resin catalyst. 2,2,4-Trimethyl-1,2-dihydroquinoline compounds are obtained in good yield and containing substantially no catalyst residue contaminant.

Process for the preparation of 2,2,4-trimethyl-1,2-dihydroquinoline

Process for the preparation of Compound I by treating Compound II with X.sub.2 or SO.sub.2 X.sub.2 in the presence of a free radical initiator and an anhydride having the formula (RCO).sub.2 O while eliminating the acid halide formed having the formula RCOX from the reaction mixture, wherein Compounds I and II have the formulas ##STR1## and R is C.sub.1 -C.sub.3 alkyl, X is Cl or Br and n is 1, 2 or 3.

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Kingsport, TN, United States of America

Joseph S Bowers, Jr