N-Heterocyclic Olefin Stabilized Borenium Cations

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• 作者：Yuzhong Wang ; Mariham Y. Abraham ; Robert J. Gilliard ; Jr. ; Daniel R. Sexton ; Pingrong Wei ; Gregory H. Robinson
• 刊名：Organometallics
• 出版年：2013
• 出版时间：November 25, 2013
• 年：2013
• 卷：32
• 期：22
• 页码：6639-6642
• 全文大小：242K
• 年卷期：v.32,no.22(November 25, 2013)
• ISSN：1520-6041

文摘

The reaction of the N-heterocyclic dicarbene (NHDC) [:C{[N(2,6-Prⁱ₂C₆H₃)]₂CHCLi(THF)}]_n with iodomethane, in a hexane/THF mixture, affords the ylidic N-heterocyclic olefin NHC鈺怌H₂ (1; NHC = :C{N(2,6-Prⁱ₂C₆H₃)CH}₂) in high yield. The reaction of 1 with BBr₃ in hexane gives the neutral compound NHC鈥揅H₂:BBr₃ (2), which in THF unexpectedly converts to the borenium salt [NHC鈥揅H₂:B{O(CH₂)₄Br}₂]⁺[Br]^{鈭?/sup> (3) through ring opening of THF.}