作者:Tim Schulz、Daniel Weismann、Lars Wallbaum、Robin Guthardt、Charlotte Thie、Michael Leibold、Clemens Bruhn、Ulrich Siemeling
DOI:10.1002/chem.201502315
日期:2015.9.28
The portfolio of acyclic diaminocarbenes (ADACs) has been substantially expanded, owing to the synthesis of eleven new formamidinium salts, mostly of the type [(iPr2N)CH(NRR′)][PF6], for use as immediate carbene precursors. The corresponding ADACs (iPr2N)C(NRR′) were sufficiently stable for isolation in the case of NRR′=2‐methylpiperidino (13), 3‐methylpiperidino (14), 4‐methylpiperidino (15), morpholino
由于合成了十一种新的用作直接卡宾的新的甲ami盐,其中大多数为[(i Pr 2 N)CH(NRR')] [PF 6 ]型,因此无环二氨基卡宾(ADAC)的产品组合得到了实质性扩展。前体。在NRR'= 2-甲基哌啶子基(13),3-甲基哌啶子基(14),4-甲基哌啶子基(15),吗啉代(17)的情况下,相应的ADAC(i Pr 2 N)C(NRR')具有足够的稳定性,可用于分离。)和N i PrPh(20),但在NRR'= 2,2,6,6-四甲基哌啶子基(12)和N i的情况下必须原位捕获PrMe(19)。四芳基取代的ADAC(Ph 2 N)2 C(22)和(Ph 2 N)C [N(C 6 F 5)2 ](24)也只能在原位生成和捕获。用元素硒诱捕特别有效,在所有情况下都能提供相应的硒硒衍生物,而用[Rh(μ-Cl)(cod)} 2 ]诱捕对12和24无效。的77角硒NMR化学位移,δ(7