Synthesis of a transient tropylidene substituted N-heterocyclic carbene (tropNHC): rearrangement and formation of its gold complex
作者:Carsten Böhler、Daniel Stein、Nicola Donati、Hansjörg Grützmacher
DOI:10.1039/b203670c
日期:——
not gave a stable N-heterocyclic carbene bistropNHC 6 but the imidazole derivative 2-(5H-dibenzo[a,d]cyclohepten-10-yl)-1-(5H-dibenzo[a,d]cyclohepten-5-yl)-1H-imidazole 9 as a product of a rearrangement. However, the unstable carbene 6 can be trapped when it is generated in the presence of [AuCl(PPh3)] whereby the stable cationic mixed phosphane carbene gold complex [1,3-bis(5H-dibenzo[a,d]cyclohe
伯噻吩基亚胺基胺tropamine 2 [IUPAC:(5 H-二苯并[ a,d ]环庚基-5-基]胺]与乙二醛OHC–CHO(3)的缩合反应生成相应的1,4-二氮杂二烯bistropdad 4 [IUPAC:1,4-双(5 H-二苯并[ a,d ]环庚基-5-基)-1,4-重氮杂丁-1,3-二烯]。用甲醛和盐酸HCl,将4转化成双tropimidazolium盐5 [IUPAC:1,3-双(5 H-二苯并[ a,d ]环庚烯基]咪唑鎓氯化物]。KO t的去质子Bu中的Bu没有给出稳定的N-杂环卡宾bistropNHC 6,而是咪唑衍生物2-(5 H-二苯并[ a,d ]环庚基-10-基)-1-(5 H-二苯并[ a,d ]环庚基-5-yl)-1 H-咪唑9作为重排产物。然而,当在[AuCl(PPh 3)]存在下生成不稳定卡宾6时,会被捕获,从而稳定的阳离子混合膦卡宾金络合物[[1,3-bis(5