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-methylbenzyltrimethylammonium hydroxide or derivatives thereof, in an aqueous solution of an alkali metal hydroxide, wherein said elimination is carried out in the presence of a dialkylether of mono- and poly-ethylene glycols having the formula: R--O--CH.sub.2 CH.sub.2 O--.sub.n R' (I) wherein R and R', which may be the same or different, represent alkyl groups having from 1 to 5 carbon atoms, and n is an integer from 1 to 5.
Claims10
A process for preparing (2,2)-paracyclophane and derivatives thereof of the formula:
- ##STR4## wherein X is a halogen atom, an alkyl radical, an aralkyl radical, or a halo-aralkyl radical having up to 20 carbon atoms, and p is zero or an integer from 1 to 4, by the Hofmann elimination of p-methylbenzyl trimethyl-ammonium hydroxide or derivatives thereof of the formula:
- ##STR5## wherein X and p are the same as defined above, in an aqueous solution of an alkali metal hydroxide, characterized in that said Hofmann elimination is carried out in the presence of at least one di-alkylether of mono- and poly-ethylene glycols having the formula:
- R--O--CH.sub.2 CH.sub.2 O--.sub.n R' (I)
- wherein R and R', which may be the same or different, represent alkyl radicals having from 1 to 5 carbon atoms, and n is an integer from 1 to 5.
Dependencies are inferred from the claim text.