The tris(phosphine) substituted carbonyls, M(CO)2(PPh3)3(M = Ru or Os) have been prepared by formal deprotonation of [MH(CO)2(PPh3)3]+ with methoxide ion; carbonyl groups are trans and a phosphine is easily lost leading to various derivatives including Ru(C2H4)(CO)2(PPh3)2 and Os(O2)(CO)2(PPh3)2.
B. E. Cavit, K. R. Grundy and W. R. Roper, J. Chem. Soc., Chem. Commun., 1972, 60b DOI: 10.1039/C3972000060B
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