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The coordination chemistry of molybdenum(VI) dioxodichloride, molybdenum(VI) oxotetrachloride, and molybdenum(V) oxotrichloride was studied, and considerable emphasis was placed on derivatives of acetylacetone. From M0O2CI2 it was found possible to synthesize the yellow molybdenyl bisacetylacetonate, M002(0511702)2, and the air-stable amide complexes, MoChCL^L, where L = , -dimethylformamide, , -dimethylacetamide, and , -dibutylacetamide. Molybdenum(V) oxotrichloride was readily prepared by reduction of M0OCI4 with refluxing chlorobenzene. This oxychloride reacted with acetylacetone to give the benzene-soluble acetylacetonate, MoOClCCs^ChL Dimethyl sulfoxide and pyridine reacted wth M0OCI3 to form MoOCl3-2(CH3)2SO and MoOCl^CsHsN. Molybdenum(VI) oxotetrachloride was found to be readily reducible in solution to form adducts containing the M0OCI3 nucleus. Reaction with acetylacetone formed the neutral acetylacetone adduct, MoOCls'CsHgCh, and a similar reaction with benzophenone allowed the formation of M0OCI3• (CeHt^CO. Also, the molybdenum(V) complex, MoOCl3-2C5H6N, was formed by the reaction of M0OCI4 with pyridine. Molybdenum)VI) oxotetrachloride was found to oxidize aromatic compounds with specific coupling in the para position: refluxing phenol formed 4,4 '-dihydroxybiphenyl and refluxing benzene reacted to give poly-/>-phenylene.

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