Regioselective Synthesis of η<sup>4</sup>-Dienylphosphane Ruthenium Complexes by Oxidative Coupling Reactions
作者:J. Díez、M. P. Gamasa、E. Lastra、A. Villar、E. Pérez-Carreño
DOI:10.1021/om700476f
日期:2007.10.1
Complexes [Ru(eta(5)-C5H5)kappa(3)(P,C,C)-Ph2P(CH2)(n)CH=CH2}(MeCN)][PF6] (n = 1 (1), 2 (2)) react with C C bonds of propargylic alcohols to yield regioselectively the complexes [Ru(eta(5)-C5H5)kappa(P),eta(4)-Ph2P(CH2)(n)CH=CHC(R)=CH2}][PF6] (n = 1, R = CPh2OH (3), C(C12H8)OH (4), C(C4H8)OH (5), CMePhOH (6a, 6b); n = 2, R = CPh2OH (7), C(C4H8)OH (8), CMePhOH (9a, 9b), CHPhOH (10a, 10b)). The reaction of complex 1 with terminal alkynes also leads regio selectively to the complexes [Ru(eta(5)-C5H5)kappa(P),eta(4)-(2Z,4E)-Ph(2)pcH(2)CH=CHCH=CH(R)}][PF6] (R = Ph (11), p-MeC6H4 (12)). Single-crystal X-ray diffraction analyses for complexes 9a, 9b, 10b, and 12 have been carried out and allow the unambiguous assignment of the stereochemistry of the complexes. DFT calculations regarding the thermodynamic stability of the obtained products have also been performed.