Frustrated Lewis Pair Reactions With Bis-Acetylenic Substrates: Exploring the Narrow Gap Separating Very Different Competing Reaction Pathways
作者:René Liedtke、Roland Fröhlich、Gerald Kehr、Gerhard Erker
DOI:10.1021/om200615n
日期:2011.10.10
respectively. Eventually, the reaction of 9 with the poorly nucleophilic phosphine P(C6F5)3 in combination with B(C6F5)3 gave the zwitterionic product 14, which is thought to result from a two-step reaction involving 1,1-carboboration followed by an exo-dig cyclization by means of a 1,2-P/B FLP reaction of the in situ generated alkenylborane Lewis acid and P(C6F5)3 to the remaining alkynyl unit. The products
在环境条件下,三(五氟苯基)硼烷与9,9-二炔丙基芴(5)以2:1的比例反应,生成双1,1碳硼化产物(Z,Z)-(E,Z)的统计混合物) -和(E,E) - 6。产物混合物的光解产生基本上富含(Z,Z)-6异构体的新混合物。治疗5与P(ø甲苯基)3 / B(C 6 ˚F 5)3沮丧的刘易斯对给出了两性离子八元杂环7a,它是一个炔基单元的1,1碳羰基化,然后在分子内1,2加成原位生成的新FLP到剩余的炔基部分的产物。P t Bu 3 / B(C 6 F 5)3 FLP的反应给出了相似的结果,得到7b。用P t Bu 3 / B(C 6 F 5)3 FLP处理1,2-二乙炔基苯(9)导致去质子化,形成the /炔基硼酸盐10。使用膦P(邻甲苯基)3和P Ph 2 [2,5-双(三氟甲基)苯基]}的三芳基膦/ B(C 6 F 5)3对的反应生成纯净的1,2-P /将B FLP加到C≡C三键