Process for directed chlorination of alkylbenzenes

Details Process for directed chlorination of alkylbenzenes Process for directed chlorination of alkylbenzenes

1976-10-04

1978-01-17

Davis, C.

Chemistry of carbon compounds

Miscellaneous organic carbon compounds

C-metal

252429R, C07C 2504

Patent

active

040692647

ABSTRACT:
A process for the production of nuclear chlorinated alkylbenzenes comprises reacting, in the liquid phase, alkylbenzene with chlorine in the presence of a Lewis acid catalyst and a co-catalyst comprising a thianthrene compound or mixture of thianthrene compounds characterized by the formula: ##STR1## WHERE EACH N IS 0 TO 1, EACH X IS HYDROGEN OR AN ELECTRON-WITHDRAWING SUBSTITUENT OR AN ELECTRON-DONATING SUBSTITUENT WITH THE PROVISO THAT AT LEAST ONE X IS AN ELECTRON WITHDRAWING SUBSTITUENT AND AT LEAST ONE X IS ELECTRON-DONATING SUBSTITUENT. A preferred co-catalyst is dimethyldichlorothianthrene. The monochlorinated alkylbenzene products prepared in this manner are characterized by a desirably low ratio of ortho to para isomer.

REFERENCES:
patent: 1741305 (1929-12-01), Jaeger
patent: 1946040 (1934-02-01), Stoesser et al.
patent: 3226447 (1965-12-01), Binj et al.
patent: 4031142 (1977-06-01), Graham
patent: 4031147 (1977-06-01), Graham

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