REACTIONS OF CYCLOHEXANE DERIVATIVES IN SUPERACIDS

REACTIONS OF CYCLOHEXANE DERIVATIVES IN SUPERACIDS
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DOI:
10.1039/p29910001541
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发表时间:
1991-10-01
期刊:
JOURNAL OF THE CHEMICAL SOCIETY-PERKIN TRANSACTIONS 2
影响因子:
--
通讯作者:
WHITTAKER, D
WHITTAKER, D
中科院分区:
其他
文献类型:
--
作者:
DEAN, C;WHITTAKER, D

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薄荷醇与FSO_3 H-SO_2和新薄荷酰氯与SbF_5-SO_2ClF的反应遵循不同的路线。 第一个产生取代的环戊基阳离子,第二个产生取代的环己基阳离子。 对取代的环己基氯化物的实验表明,除了一个碳原子之外,下一个碳原子上的所有氢原子被取代到反应中心阻止了碳正离子的形成。 有人建议,电离的赤道氯原子发生的协助下,从分子内的电子相互作用,形成甲基环戊基碳阳离子在一个同步的过程中,而不是逐步通过环己基碳阳离子。 溶剂分解反应的对比行为的原因进行了讨论。
The reactions of menthol with FSO3H-SO2 and neomenthyl chloride with SbF5-SO2ClF follow different routes. The first yields a substituted cyclopentyl cation and the second a substituted cyclohexyl cation. Experiments on substituted cyclohexyl chlorides show that replacement of all the hydrogen atoms on the next but one carbon atom to the reaction centre blocks formation of a carbocation. It is suggested that ionisation of an equatorial chlorine atom takes place with assistance from an intramolecular electronic interaction, forming the methyl cyclopentyl carbocation in a synchronous process, rather than stepwise via the cyclohexyl carbocation. Reasons for contrasting behaviour in solvolytic reactions are discussed.