Organic compounds -- part of the class 532-570 series – Organic compounds – Heterocyclic carbon compounds containing a hetero ring...
Patent
1983-04-11
1985-09-17
Jiles, Henry R.
Organic compounds -- part of the class 532-570 series
Organic compounds
Heterocyclic carbon compounds containing a hetero ring...
568652, C07D30786
Patent
active
045422290
ABSTRACT:
A process is described for preparing 2,3-dihydro-2,2-dimethylbenzofuran-7-ol (I), which is a useful intermediary 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.methallyloxyphenol with high conversion and high selectivity; this product is thermally transposed to o.methallylpyrocatechol, which is finally cyclized to the product (I) by heterogeneous catalysis in the presence of solid acid catalysts.
All stages of the process can be carried out in a single reaction medium, without separating intermediate products.
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Dehmlow et al., Phase Transfer Catalysis-Verlag Chemie, (1980) pp. 1-11.
Synthesis, No. 4, Apr. 1973, p. 209 "2,5-Dimethylfuran, An Application of Ion Exchange-Resin Catalysis in Organic Synthesis", Scott et al.
Correale Mariano
Maggioni Paolo
Minisci Francesco
Brichima S.p.A.
Dentz Bernard I.
Jiles Henry R.
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