Selective Cα–Cβ bond cleavage by water in allenylidene and alkenylvinylidene ruthenium complexes
作者:Claudio Bianchini、Maurizio Peruzzini、Fabrizio Zanobini、Carlos Lopez、Isaac de los Rios、Antonio Romerosa
DOI:10.1039/a900011i
日期:——
The Ru(II) complex mer,trans-[(PNP)RuCl2(PPh3)] [PNP = MeCH2CH2N(CH2CH2PPh2)2] reacts in refluxing THF with propargyl alcohols HCCCRRâ²OH (R = Râ² = Me, Ph; R = Me, Râ² = Ph) yielding either the allenylidene complex fac,cis-[(PNP)RuCl2CCCPh2}] or the alkenylvinylidene derivatives fac,cis-[(PNP)RuCl2CC(H)C(R)CH2}] (R = Me, Ph); treatment of all these complexes in CH2Cl2 or THF with water results in the formation of the ruthenium carbonyl fac,cis-[(PNP)RuCl2(CO)] and free alkenes H2CCRRâ² (R = Râ² = Me, Ph; R = Me, Râ² = Ph) via regioselective CαâCβ bond cleavage.
该Ru(II)配合物mer,trans-[(PNP)RuCl2(PPh3)] [PNP = MeCH2CH2N(CH2CH2PPh2)2] 在THF回流条件下与丙炔醇HCCCRR'OH(R = R' = Me, Ph; R = Me, R' = Ph)反应,生成allenylidene配合物fac,cis-[(PNP)RuCl2CCCPh2}]或alkenylvinylidene衍生物fac,cis-[(PNP)RuCl2CC(H)C(R)CH2}](R = Me, Ph);将这些配合物在CH2Cl2或THF中与水处理,会通过选择性Cα–Cβ键断裂生成铑羰基fac,cis-[(PNP)RuCl2(CO)]和自由烯烃H2CCRR'(R = R' = Me, Ph; R = Me, R' = Ph)。