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Thermally labile cobalt and manganese acyl compounds L-(CO)3Co-COR (L = CO, PPh3)' and (CO)5Mn-COR2 reportedly incorporate hydrosilanes and fragment to aldehyde RCHO plus metal silyl complex under mild conditions.3 An alternative pathway in which Si-H adds across the acyl carbonyl and generates -siloxyalkyl compounds has not been observed previously, even though such products are available by other pathways.Cobalt examples, L(CO)3Co-CH(OSiR'3)R, that derive from silyl complexes and aldehydes are presumed intermediates during Co2(CO)g-catalyzed incorporation of CO and silane into alkenes and various organic oxygen-containing compounds.4 Gladysz and co-workers5 isolated several unstable manganese a-siloxyalkyl complexes after treating (CO)5Mn-SiMe3 with aldehydes. The resulting (CO)5Mn-CH(OSiMe3)Ph slowly undergoes homolytic dissociation of the Mn-C bond,6 and (CO)5Mn-CH(OSiMe3)CH3 rapidly /^-eliminates (CO)5MnH/CH2=CHOSiMe3, although in the presence of CO it affords the -siloxypropionyl derivative (CO)5Mn-COCH(OSiMe3)CH3.5b Stable -siloxyethyl complexes Fp-CH(OSiHR'2)CH3 (Rf = Et2, Ph2, MePh) are available through Rh(I)-catalyzed hydrosilation of Cp(CO)2Fe-COCH37 (and analogous thermally nonlabile acyl compounds)8

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