Rearrangements de dihydro-2, 3 benzo-b furannes α vinyliques en milieu acide: acces a des benzo-b furannes et 2h-benzo-b pyrannes
M David, J Sauleau, A Sauleau
Index: David, M.; Sauleau, J.; Sauleau, A. Tetrahedron, 1988 , vol. 44, # 12 p. 3587 - 3594
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Citation Number: 2
Abstract
Neighbouring alkene group participation, resulting in isomerization, has been studied in reactions of some 2, 3 dihydrobenzofurans with hydrobromic acid (in acetic acid) and with paratoluene sulfonic acid (in benzene). It was found that these 2-vinyl cyclic ethers afford benzo-b furans and Δ 3-chromenes; the ratio of five-to six menbered ring products depending upon the reaction conditions and upon the number of methyl groups at the ...
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