| 摘要 |
For the Contracting States : AT, BE, CH, GB, LI, LU, NL, SE 1. A process for the preparation of 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran from ortho-methallyloxyphenol by heating, by rearrangement or the ortho-methallyloxyphenol and then cyclisation of the rearranged compound thus obtained, wherein at least the cyclisation step is carried out by heating in the presence of an effective amount of a catalyst consisting of a tin derivative. For the Contracting States : DE, FR, IT 1. A process for the preparation of 2,3-dihydro-2,2-dimethyl-7-hydroxybenzofuran from ortho-methallyloxyphenol by heating, by rearrangement or the ortho-methallyloxyphenol and then cyclisation of the rearranged compound thus obtained, wherein at least the cyclisation step is carried out by heating in the presence of an effective amount of a catalyst consisting of a tin derivative which is not SnCI4 . |
