Method for producing arylethylene

Details Method for producing arylethylene Method for producing arylethylene

C - Chemistry, Metallurgy

07

C

260/683.7

C07C 4/24 (2006.01) C07C 4/00 (2006.01) C07C 15/40 (2006.01) C07C 15/46 (2006.01)

Patent

CA 1309421

ABSTRACT OF THE DISCLOSURE A method for producing arylethylene comprising four steps of: (I) bringing 1,1-diarylethane into contact with an acid catalyst in the presence of an inert gas to crack said compound into arylethylenes and alkylbenzenes; (II) separating the reaction mixture obtained in the above cracking step (I) into at least a fraction mainly containing 1,1-diarylethane; (III) bringing said fraction mainly containing 1,1-diarylethane into contact with hydrogen gas in the presence of a hydrogenation catalyst; and (IV) re-cracking hydrogenated fraction obtained in the preceding hydrogenation step (III) by bringing it into said cracking step (I). Particularly, this method is useful for producing p-isobutylstyrene which is a starting material for preparing a valuable medicine of ibuprofen.

582505

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