Ring opening of dibenzo-1,2-oxathiin 2-oxide (1a) and 3,4-dihydro-1,2-benzoxathiin 2-oxide (1b) is accelerated by buffer bases while that of 3H-2,1-benzoxathiole 1-oxide (1d) is essentially independent of buffer concentrations in tertiary amine buffers or decelerated in some buffers. These results are taken as evidence for the hypervalent intermediate of this reaction.
二苯并-1,2-氧
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环己烷 2-氧化物(1a)和 3,4-二氢-1,2-苯并氧
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环己烷 2-氧化物(1b)的环开环反应在缓冲碱的作用下加速,而 3H-2,1-苯并氧
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环己烷 1-氧化物(1d)的环开环反应则基本不受叔胺缓冲液中缓冲浓度的影响,或在某些缓冲液中减慢。 这些结果被作为该反应超价中间体的证据。