Abstract
(PPh4)2[MoO(O2)2(SHAH)]·H2O and PPh4[MoO(O2)2(HBA)] (SHAH3 = 2-hydroxybenzohydroxamic acid and HBAH = 2-hydroxybenzoic acid) have been synthesized and characterized by physico-chemical and spectroscopic methods. In addition, the second complex has been structurally characterized by single-crystal X-ray diffraction analysis. We have compared the catalytic activities of these two new complexes, together with the previously reported PPh4[MoO(O2)2(BZ)] (BZH = benzoic acid), with respect to the epoxidation of alkenes. The hydroxamate complex is the most efficient catalyst among the three complexes, showing excellent catalytic activity for the substrates cyclohexene, cyclooctene, cinnamyl alcohol, pent-4-en-1-ol and hex-1-ene.
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We also acknowledge CSIR, New Delhi for partial financial assistance under the project [01 (1818)/02/EMR-II] and DST, Govt. of India, for financing for Agilent 6,890 N gas chromatograph.
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Dedicated to Late Prof. Ramgopal Bhattacharyya, Department of Chemistry, Jadavpur University.
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Gharah, N., Chattopadhyay, B., Maiti, S.K. et al. Synthesis and catalytic epoxidation potential of oxodiperoxo molybdenum(VI) complexes with 2-hydroxybenzohydroxamate and 2-hydroxybenzoate: the crystal structure of PPh4[MoO(O2)2(HBA)]. Transition Met Chem 35, 531–539 (2010). https://doi.org/10.1007/s11243-010-9360-3
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DOI: https://doi.org/10.1007/s11243-010-9360-3