[OsHCl(CS)(PPh3)3] reacts with CO giving a blue thioformyl complex [Os(CHS)Cl(CO)2(PPh3)2]; this is readily methylated on sulphur forming a secondary thiocarbene complex which upon hydrolysis yields a formyl complex, [Os(CHO)Cl(CO)2(PPh3)2].
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Collins et al. (1976) studied this question.
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