PROCESS FOR THE PREPARATION OF GEMINAL DIHALIDES

摘要

1503408 Preparation of geminal dihalides BAYER AG 3 June 1976 [7 June 1975 30 July 1975] 22974/76 Heading C2C A geminal dichloride is obtained by reacting phosgene or thionyl chloride with a non- enolizable aldehyde and/or ketone in the presence of an organyl-phosphorus compound of 3- and/or 5-valent P, or in the presence of an N,N-dialkyl-substituted carboxylic acid amide. Specified types or organyl-phosphorus compounds are triorganyl phosphines, diorganylhalosphosphines, triorganyl phosphonium salts, triorganylphosphorus betaines, triorganylphosphinealkylenes, 1,1 - dihalo - triorganylphosphines, 1 - halo - 1 - acyl - triorganylphosphines, 1 - halo - 1 - hydroxy - triorganylphosphines, tri-organyl-phosphine oxides and tri-organyl-phosphine sulphides. The N,N-disubstituted carboxylic amides may be openchain or cyclic compounds. Specified types of aldehydes and ketones for use as starting materials are aliphatic and aromatic aldehydes and ketones, cycloaliphatic ketones, alkylaryl and diaryl ketones as well as diaryl α-diketones. The reaction may be carried out in the presence or absence of solvents. 1,4 - Bis - (41,411 - dihydroxy - triphenylmethyl)-benzene is obtained by reacting phenol with 1,4 - bis - (α,α - dichlorobenzyl) - benzene in dioxane.