13 C N.m.r. spectra of the compounds [Os3(CO)12–n(PEt3)n](n= 1 or 2) indicate that carbonyl exchange occurs selectively along one edge of the Os3, triangle at low temperatures. The process involves only six of the 12 –n carbonyl groups in [Os3(CO)12–n(PEt3)n](n= 1 or 2), and a mechanism involving a double carbonyl bridge is proposed.
B. F. G. Johnson, J. Lewis, B. E. Reichert and K. T. Schorpp, J. Chem. Soc., Dalton Trans., 1976, 1403 DOI: 10.1039/DT9760001403
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