| 摘要 |
Process for the preparation of (2,2)-paracyclophane or derivatives thereof by the Hofmann elimination of p-methyl-benzyl-trimetylammonium 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)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. (2,2)-paracyclophane and its derivatives such as dichloro (2,2)-paracyclophane, tetrachloro-(2,2)-paracyclophane, tetramethyl-(2,2)-paracyclophane, dimethyl-dichloro-(2,2)-paracyclophane, diethyl-(2,2)-paracyclophane, dibromo-(2,2)-paracyclophane, etc., are products well known in the literature and are generally utilized as intermediates in the preparation of the corresponding poly-p.-xylylene. Said polymers, and in particular poly-p.xylylene and its chlorinated derivatives, are advantageously utilized in the form of coating films in the field of the conformal coating, obtained by application according to the vacuum vapor deposition technique, in the electronic field. According to the present invention, it has now been discovered that (2,2)-paracyclophane and derivatives thereof having formula (II) may be prepared in a pure form, with high industrial yields, such as higher than 70% by mols. |
