作者:Kai Schwedtmann、Robin Schoemaker、Felix Hennersdorf、Antonio Bauzá、Antonio Frontera、Robert Weiss、Jan J. Weigand
DOI:10.1039/c6dt01871h
日期:——
the presence of AgOTf. NHC 17b[OTf] represents a very effective dehydrocoupling reagent for secondary (R2PH, R = Ph, Cy, iBu) and primary (RPH2, R = Ph, Cy) phosphanes to give diphosphanes of type R4P2 (R = Ph, Cy, iBu) and oligophosphanes R4P4, R5P5 (R = Ph, Cy), respectively. Methylation of 17b+ and subsequent deprotonation reaction with LDA affords the cationic NHO (N-heterocyclic olefin) 35+ of
2-磷酰基取代的咪唑鎓盐2-PR 2(4,5-Cl-Im)[OTf](9a,b [OTf])(4,5-Cl-Im = 4,5-二氯-1,3-由R 2 PCl(R = Cy,Ph)与NHC 8(4,5- Me 3 SiOTf存在下的二氯-1,3-双(2,6-二异丙基苯基)-咪唑啉-2-亚烷基)。当使用略微过量的NHC 8时,可以定量收率获得5-磷酸取代的咪唑鎓盐5-PR 2(2,4-Cl-Im)[OTf](10a,b [OTf])。5-膦取代的咪唑鎓盐5-PR 2 Me(2,4-Cl-Im)[OTf] 2(14a,b[OTf] 2)和5-PR 2 F(2,4-Cl-Im)[OTf] 2(16a,b [OTf] 2)是由于10a,b [OTf]与XeF 2和随后的氟化物提取。根据我们的量子化学研究,在14b 2+的咪唑鎓环的2位上的Cl1原子带有轻微的正电荷,因此可用于亲核攻击。因此,14a,b