Formation of β-carbonylmethylpalladium(II) complexes and alkenones directly from ketones via CH bond activation by the palladium(II) acetate-dialkyl sulfide system
作者:Yoshio Fuchita、Yasuo Harada
DOI:10.1016/s0020-1693(00)82882-0
日期:1993.6
Aliphatic C-H bond activation of some ketones by the Pd(O2CMe)2-SBui2 system has been studied. Heating the system in acetone or t-butyl methyl ketone at 70-degrees-C, and the following treatment of the resulting mixture with Me2bipy (4,4'-dimethyl-2,2'-bipyridyl) and NaCl affords the beta-carbonylmethylpalladium(II) complex [PdCl(CH2COR)(Me2bipy)] (R=Me, Bu(t)). In the case of the reaction in ethyl methyl ketone, the 2-butanonyl complex [PdCl(CH2COCH2CH3)(Me2bipy)] is isolated, together with the formation of methyl vinyl ketone. On the contrary, for reactions in cyclopentanone and cyclohexanone, only the corresponding 2-cycloalken-1-ones are yielded. The relationship between the formation of beta-carbonylmethyl complexes and alkenones has been discussed.