Steric and electronic effects on the regioselective formation of platinum(II) metallacycles: crystal structure of [PtMe(3-MeC6H3CHNCH2C6H5)(PPh3)]
作者:Margarita Crespo、Xavier Solans、Mercè Font-Bardía
DOI:10.1016/0022-328x(96)83109-3
日期:1996.2
The reaction of [Pt(2)Me(4)(mu-SMe(2))(2)] (1) with imines 3,4-(OMe)(2)C6H3CH=NCH(2)Ph (2c) and 3-MeC(6)H(6)CH=NCH(2)Ph (2e) yields cyclometallated compounds [PtMe(3,4-(OMe)(2)C6H2CH=NCH(2)Ph)(SMe(2))] (4c) and [PtMe(3-MeC(6)H(3)CH=NCH(2)Ph)(SMe(2))] (4e) arising from selective metallation at the less hindered of the two non-equivalent ortho positions of the aryl ring, followed by loss of methane. These compounds react with PPh(3) to give cyclometallated compounds [PtMe(3,4-(OMe)(2)C6H2CH=NCH(2)Ph)(PPh(3))] (5c) and [PtMe(3-MeC(6)H(3)CH=NC(2)Ph)(PPh(3))] (5e). Imines 2,4,6-(OMe)(3)C6H2CH=NCH(2)Ph (2a), 3,5-(OMe)(2)C6H3CH=NCH(2)Ph (2b) and 2,5-Me(2)C(6)H(3)CH=NCH(2)Ph (2d) coordinate to platinum through the nitrogen atom to yield compounds [PtMe(2)(ArCH=NCH(2)Ph)(SMe(2))] (3) but fail to produce cyclometallated compounds.