Complexes of platinum and palladium with tertiary dimethoxyphenylphosphines: attempts to effect O- or C-metallation
作者:H. David Empsall、Peter N. Heys、Bernard L. Shaw
DOI:10.1039/dt9780000257
日期:——
several palladium complexes of the above ligands have been prepared, attempts to effect O-metallation have been unsuccessful, palladium metal being obtained. O-Metallation is favoured by a polar solvent, but in xylene PPh2[C6H3(OMe)2-2,6] reacts with [PtCl2-(NCPh)2] to give the C-metallated complex [Pt2Cl2CH2OC6H3(OMe-3)(PPh2-2)}2], several derivatives of which have been prepared. Attempts to effect
描述并表征了新的叔膦类PBu t 2 R和PPh 2 R(R = 2,3-或2,6-二甲氧基苯基)。化合物PPh 2 [C 6 H 3(OMe)2 -2,6]与BBr 3反应,然后与乙酸酐反应,得到PPh 2 [C 6 H 3-(OCOMe)2-2,6]。讨论了这些新配体的构象和空间效应,正如预期的那样,在与铂形成络合物时,大体积的膦比小体积的膦更容易脱甲基。2,6-二甲氧基苯基膦在形成复合物时特别容易失去一个甲基,而2,3-二甲氧基苯基膦则较不容易失去。已经制备了顺式-[Pt OC 6 H 3(OMe)(PPh 2)} 2 ]和反式-[Pt OC 6 H 3-(OMe)(PBu t 2)} 2 ]类型的稳定络合物,配体通过苯氧和氧膦磷原子螯合。该dichelate顺-[Pt OC 6 H 3(OMe-6)(PPh 2 -2)} 2 ]被Na [BH 4 ]还原为氢化物[PtH OC