Process for producing 3,5-dichloro-.alpha.-methylstyrene
AssigneeIshihara Sangyo Kaisha, Ltd.
InventorsRyuzo Nishiyama, Kanichi Fujikawa, Yasuhiro Tsujii, Itaru Shigehara
Life of this patent
Estimating the term…
Abstract
1-Bromo-3,5-dichlorobenzene is reacted with magnesium in a solvent and acetone is added to react it with the reaction product and a mineral acid is added to hydrolyze the resulting .alpha.-(3,5-dichlorophenyl) isopropoxymagnesium bromide and then, the product is dehydrated to obtain 3,5-dichloro-.alpha.-methylstyrene. 3,5-Dichloro-.alpha.-methylstyrene is useful intermediate for various agricultural chemicals, medicines and dyes and also useful monomer for rubbers, plastics and resins.
Claims3
A process for producing 3,5-dichloro-.alpha.-methylstyrene which comprises a step (a) of reacting magnesium with 1-bromo-3,5-dichlorobenzene in the presence of an ether solvent at a reaction temperature in a range of 10.degree. to 70.degree. C., wherein the amount of magnesium is in a range of 1 to 1.5 mole per mole of 1-bromo-3,5-dichlorobenzene;
- a step (b) of adding acetone to the reaction mixture at a temperature in the range of 0.degree. to 70.degree. C.;
- and a step (c) of adding a mineral acid to the reaction mixture to hydrolyze the resulting .alpha.-(3,5-dichlorophenyl) isopropoxymagnesium bromide at a temperature in a range of 0.degree. to 100.degree. C.;
- and then dehydrating the product at a temperature in a range of 80.degree. to 120.degree. C.
Dependencies are inferred from the claim text.