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RuH(Ph)(CO)L(2) (L = P(t)Bu(2)Me) reacts with SiH(2)Ph(2) to give first benzene and RuH(SiHPh(2))(CO)L(2), and then RuH(3)(SiHPh(2))(CO)L(2) and Ru(H)(2)(CO)L(2), the trihydride being formed by a dehydrogenative silane coupling reaction when excess SiH(2)Ph(2) is present. Variable-temperature spin saturation transfer experiments reveal exchange between H(a) and H(b) in RuH(a)(SiH(b)Ph(2))(CO)L(2); this occurs both by an intramolecular mechanism and (when SiH(2)Ph(2) is present) by a mechanism dependent on SiH(2)Ph(2) concentration. Spin saturation transfer also reveals exchange between all three of the above complexes via addition/loss of SiH(2)Ph(2) or H(2). 相似文献
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