Selective Rhodium-Catalyzed Hydroformylation of Terminal Arylalkynes and Conjugated Enynes to (Poly)enals Enabled by a π-Acceptor Biphosphoramidite Ligand
Palladium(II) and palladium(0)-cocatalyzed ring opening and oxidation reactions of 2-(arylmethylene)cyclopropylcarbinols
作者:Min Shi、Guo-Qiang Tian、Jia Li
DOI:10.1016/j.tet.2009.02.028
日期:2009.4
In the presence of Pd(II) acetate and triethylamine as well as triphenylphosphine, 2-(arylmethylene)cyclopropylcarbinols 1 underwent ringopening and oxidation reactions smoothly to deliver (2E,4E)-5-arylpenta-2,4-dienals 2 in toluene at 60 °C in moderate to good yields under ambient atmosphere. Mechanisms involved with an in situ generated Pd(0) species from Pd(II) and Et3N or PPh3 catalyzed isomerization