6-bis(diphenylphosphinomethyl)pyridine). The styrene complex undergoes vinylic deprotonation by reaction with the weakly basic nucleophiles ROH (R = Me, Et, H), which was monitored by 1H and 31P NMR. The mechanistic pathway includes nucleophilic addition of the oxygen donor nucleophiles to the coordinated styrene. The resulting addition products [Pt(PNP)(CH2CHPhOR)]BF4 transformed to the styryl complex only
该π络合物[
铂(
PNP)(CH的X射线结构2 ═CHPh)](BF 4)2和σ络合物[
PT(
PNP)((ê)-CH═CHPh)] BF 4是(
PNP = 2,6-双(
二苯基膦基甲基)
吡啶)。
苯乙烯配合物通过与弱碱性亲核试剂ROH(R = Me,Et,H)反应进行
乙烯基去质子化,该反应通过1 H和31 P NMR进行监测。机理途径包括氧供体亲核体向配位
苯乙烯的亲核加成。所得的加成产物[
PT(
PNP)(CH 2 CHPhOR)] BF 4仅在存在质子时才能转化为
苯乙烯基配合物。类似地,相关的
1-乙烯基
萘络合物[
PT(
PNP)(CH 2 = CHC 10 H 7)](BF 4)2在
甲醇存在下经历
乙烯基去质子化反应,形成相应的σ络合物[
PT(
PNP)((E)-CH = CHC 10 H 7)] BF 4。