Constrained phosphite ester complexes of π-cyclopentadienylmolybdenum tricarbonyl halides

Add time:07/29/2019    Source:sciencedirect.com

The synthesis of complexes of the type π-C5H5Mo(CO)2LX and π-C5H5Mo(CO)L2X, where XCl, Br, or I and LP(OCH2)3CR (RCH3, C2H5, or C3H7), is reported. Infrared and conductance data verified that all compounds existed as covalent species in solution. Each of the three π-C5H5Mo(CO)2LCl complexes was isolated as an inseparable mixture of cis and trans isomeric forms. Only the trans forms of the remaining π-C5H5Mo(CO)2LX complexes were observed in solution, as indicated by infrared and PMR spectra. All of the π-C5H5Mo(CO)L2X compounds apparently exist in primarily one isomeric form in solution; their PMR spectra, which exhibited a sharp triplet resonance for the −OCH2− protons of the phosphite ligands and a single sharp π-C5H5 proton signal, indicated a predominantly trans arrangement of the phosphite ligands at room temperature.

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