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US 4,816,608 AGranted
Process for the preparation of (2,2)-paracyclophane and derivatives thereof
AssigneeMontedison S.p.A.
InventorsGiorgio Bornengo, Alessandro Malacrida, Stefano Campolmi, Maurizio A. Beretta
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Abstract
Process for the preparation of (2,2)-paracyclophane or derivatives thereof by the Hofmann elimination of p-methylbenzyl-trimethylammonium hydroxide or derivatives thereof, in an aqueous solution of an alkali metal hydroxide, wherein said elimination is carried out in the presence of a compound of the formula (I): Y--A--(X).sub.n (I) wherein A represents an aromatic group, Y an electron donor group, X an electron acceptor group, and n is an integer from 1 to 3.
Claims17
A process for preparing (2,2)-paracyclophane and derivatives thereof of the formula:
- ##STR4## wherein B is a halogen atom, an alkyl radical, an aralkyl radical, or a halo-aralkyl radical, having up to 20 carbon atoms, and m is zero or an integer from 1 to 4, by the Hofmann elimination of p-methylbenzyltrimethyl-ammonium hydroxide or derivatives thereof of the formula:
- ##STR5## wherein B and m are the same as defined hereinabove, in an alkaline aqueous solution, characterized in that said elimination is carried out in the presence of at least a catalytic amount of an aromatic compound having the formula:
- Y--A--(X).sub.n (I)
- wherein A represents an aromatic group, Y an electron donor group, X an electron acceptor, and n is an integer from 1 to 3.
1 more element
Dependencies are inferred from the claim text.