Interaction of [MoO 2 (acac) 2 ] with internally functionalized oximes like HON=C(CH 3 )Ar (Ar = C 4 H 3 S, C 4 H 3 O or C 5 H 4 N) and Schiff's Bases derived from β – diketones like HOC(R)CHC(R′)=NC 6 H 5 (R = R’ = CH 3 or C 6 H 5 ; R = CH 3 and R’ = C 6 H 5 ) led to the formation of yellow dioxomolybdenum(VI) complexes of the type [MoO 2 {ON=C(CH 3 )Ar} 2 ] and [MoO 2 {OC(R)CHC(R′)=NC 6 H 5 } 2 ]. Oximes were synthesized by green methodology. The newly synthesized complexes were characterized on basis of elemental analysis and various spectral findings. Anticandidal activity of [MoO 2 {ON=C(CH 3 )C 6 H 4 N} 2 ] clearly reveals that the complex is biologically active against fungal diseases.

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Esterification reactions of carboxylic acids with different alcohols in neutral nonaqueous media have been carried out in excellent yields using catalytic amounts of dioxomolybdenum(VI) complexes of the type [MoO2L2] (where LH = acetylacetone, salicylaldehyde, o-aminophenol, 8-hydroxyquinoline, and 2-acetyl pyridoxime). The reactions of propionic acid with primary, secondary and tertiary alcohols in the presence of catalytic amounts of MoO2(acac)2 result in higher yields of the esters with primary alcohols, compared to those with secondary or tertiary alcohols. The results of the esterification reactions of propionic acid with methanol and tertiary butanol in the presence of different dioxomolybdenum(VI) complexes suggest that the homogeneous catalysts are better than heterogeneous analogues.

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