Method for producing arylethylene

Details Method for producing arylethylene Method for producing arylethylene

1988-11-14

1989-08-08

Davis, Curtis R.

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce aromatic

585320, 585321, 585426, 585439, 585446, 585456, C07C 424

Patent

active

048555193

ABSTRACT:
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.

REFERENCES:
patent: 3062903 (1962-11-01), Odioso et al.
patent: 3441625 (1969-04-01), Bergeron et al.
patent: 4070366 (1978-01-01), Gregorovich et al.
patent: 4694100 (1987-09-01), Shimizu et al.

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