| 摘要 |
1315428 (1-Phenylvinyl)-phosphonic acids KNAPSACK AG 26 Nov 1971 [8 Dec 1970] 55028/71 Heading C2P The invention comprises compounds of formula (wherein X is halogen and n is 1, 2, 3, 4 or 5), and their preparation by reacting ring-halogenated acetophenone with phosphorus trichloride and glacial acetic acid and hydrolysing the reaction mixture to give a ring-halogenated (α-hydroxy- α-methylbenzyl)-phosphonic acid which is then thermally dehydrated with or without the presence of a solvent(e.g. 1,1,2,2-tetrachloroethane) to give a compound I. |
