Process for preparing 2,3-dihydro-2,2- dimethylbenzofuran-7-ol

Details Process for preparing 2,3-dihydro-2,2- dimethylbenzofuran-7-ol Process for preparing 2,3-dihydro-2,2- dimethylbenzofuran-7-ol

C - Chemistry, Metallurgy

07

D

260/367.2

C07D 307/86 (2006.01) C07C 41/16 (2006.01) C07C 43/23 (2006.01)

Patent

CA 1205081

ABSTRACT OF THE DISCLOSURE A process is described for preparing 2, 3-dihydro- 2, 2-dimethylbenzofuran-7-ol (I), which is a useful inter- mediate in the preparation of Carbofuran, a known multi- functional insecticide. The process consists essentially of reacting the pyrocatechol and a methallylhalide in an inert organic solvent in the presence of a solid inorganic base and a suitable catalyst, to obtain o.methallyloxy- phenol with high conversion and high selectivity; this product is thermally transposed to o.methallylpyrocatechol, which is finally cyclized to the product by heterogeneous catalysis in the presence of solid acid catalysts. All stages of the process can be carried out in a single re- action medium, without separating intermediate products.

426061

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