In our investigations of the alkoxide substitution reactions of Os3(CO)10(OEt)2 with 1,3 propanediol and 4-nitrobenzamide, we have found two different pathways depending on the substituting ligand 1,3 propanediol reacts to form a compound believed to be the one shown below in which the Os3 triangle is retained with one end of the diol forming an alkoxide bridge such that the alcohol coordinates to form a ring, or “loop” structure. Addition of either CO or PPh3 displaces the “coordinating” OH to form a pendant product Os3(CO)8(µ2-O(CH2)3OH)2(L)2, L= CO or PPh3. In contrast with 4-nitrobenzamide, the triosmium cluster fragments and forms a diosmium diamide carbonyl complex, Os2(CO)6(OCNHC6H4NO2)2, which has two isomers with head-to-tail and head-to-head configurations. Characterization of products is based on carbonyl infrared spectroscopy and H1-NMR spectroscopy.

Alkoxide substitution reactions of Os3(CO)10(OEt)2 with diols and amides

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ACS Spring 2020 National Meeting & Expo

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