trans-stilbene. The rate of oxidative addition of phenyl iodide to the stilbene complexes, which gave Pd(diphos*)(Ph)(I), depended on the ligand (larger for increased ligand bite angles and reduced steric bulk) and was markedly faster than oxidative addition to mixtures of Pd(dba)2 and diphos*. The complexes Pd(diphos*)(Ph)(I) were prepared independently by treatment of PdL2(Ph)(I) (L2 = TMEDA, (PPh3)2)
手性Pd(0)反式-
二苯乙烯配合物Pd(diphos *)(反式-
二苯乙烯)(diphos * =(R,R)-Me-Duphos,(R,R)-Et-Duphos,(R,R)- i-Pr-Duphos,(R,R)-Me-BPE,(S,S)-Me-Ferro
LANE,(S,S)-Me-Du
Xantphos,(S,S)-Et-FerroTANE,(R,S)-CyPF-t-Bu,(R,S)-PPF-t-Bu,(R,S)-BoPhoz)和Ni((通过在反式-
二苯乙烯存在下,通过NaBH(OMe)3还原相应的M(diphos *)Cl 2化合物来制备R 1,R 1 -Me-Duphos)(反式-
苯乙烯)。苯
碘化物向
二苯乙烯配合物中的氧化加成速率取决于Pd(diphos *)(Ph)(I)(取决于
配体(
配体咬合角增大和空间体积减小而增大)),并且明显快于氧化加成生成Pd(dba)2和diphos *的混合物。通过处理PdL