Rapid transfer for selenium from tertiary phosphine selenides to tertiary phosphines
作者:Douglas H. Brown、Ronald J. Cross、Rodney Keat
DOI:10.1039/dt9800000871
日期:——
Selenium transfer between PR3Se and PR3[R3= MePh2 or Ph2(CH2PPh2)] in solution is rapid on the n.m.r. time scale, and a bimolecular process is indicated. Mixtures of Ph2P(Se)C2H4(Se)PPh2, Ph2P(Se)C2H4PPh2, and Ph2PC2H4PPh2 display simliar variable-temperature 1H n.m.r. characteristics and their methylene-proton signals coalesce at elevated temperatures. The compound Ph2P(Se)CH2(Se)PPh2 reacts immediately
溶液中PR 3 Se和PR 3 [R 3 = MePh 2或Ph 2(CH 2 PPh 2)]之间的硒转移在nmr时间尺度上是快速的,并且表明了双分子过程。Ph 2 P(Se)C 2 H 4(Se)PPh 2,Ph 2 P(Se)C 2 H 4 PPh 2和Ph 2 PC 2 H 4 PPh 2的混合物显示相似的可变温度1H nmr特性及其亚甲基质子信号在高温下会聚结。化合物Ph 2 P(Se)CH 2(Se)PPh 2与Ph 2 PCH 2 PPh 2混合后立即反应,仅生成Ph 2 P(Se)CH 2 PPh 2,而Ph 2 P(Se)C的溶液2 H 4(Se)PPh 2和Ph 2 PC 2 H 4 PPh 2与Ph 2 P(Se)C 2 H 4 PPh 2平衡分别以1:1:2的比例。硫类似物的行为类似,但反应慢得多。硒在环境温度下与Ph 2 P(S)CH 2 PPh 2反应仅形成Ph 2