Process for the preparation of dixylylpropane

Details Process for the preparation of dixylylpropane Process for the preparation of dixylylpropane

1993-04-08

1994-04-05

Pal, Asok

Chemistry of hydrocarbon compounds

Plural serial diverse syntheses

To produce aromatic

585310, 585321, 585465, 585466, 585440, C07C 200, C07C 268, C07C 270

Patent

active

053007174

ABSTRACT:
In a multi-step process, dixylylpropane is obtained inter alia via the hitherto unknown 1,2-dimethyl-4-(.alpha.-chloroisopropyl)benzene, the readily accessible compounds o-xylene and propene being employed as starting compounds. The process yields the desired compound in high yield and isomer purity and is distinguished by a small amount of by-products. It is therefore particularly suitable for further processing without problems. The process involves the sequence of (a) Friedel-Crafts alkylation of ortho-xylene with propylene, (b) dehydrogenation of the isoproplyxlene into isopropenylxylene, (c) which is then hydrochlorinated into chloroisopropylxylene, (d) and then alkylated with a second ortho-xylene modecule to obtain the final product dixylylpropane.

REFERENCES:
patent: 2578207 (1951-12-01), Pines et al.
patent: 2712543 (1955-07-01), Gresham et al.
patent: 4649207 (1987-03-01), Lau et al.

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