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- W2091707280 abstract "Reaction of dimethylated tert-butyl calix[4]arene, H2AMe2, with OVCl2(thf)2 unexpectedly led to the isolation of ClVIVAMe, 2, whose crystal structure was determined. Hence, one of the MeO–C bonds present in H2AMe2 has been cleaved and one equivalent of HCl eliminated leaving three phenolate and one phenolether function to coordinate at the V centre. 2 smoothly reacts with O2 to give OVVAMe, B, i.e. the chloride ligand has been replaced by a terminal oxo ligand with concomitant oxidation of the vanadium atom to the oxidation state +5. B crystallises isostructurally with 2; crystallisation of a mixture of 2 and B even leads to crystals that contain both compounds beside each other. However, when B was co-crystallised together with H2AMe2, from acetonitrile a different structure with a partial cone conformation was obtained. The mechanism by which B is formed from 2 is discussed. To obtain information concerning the fate of the chloride ligand in 2, a derivative, Ph3SiO–VIVAMe, 3, has been synthesised and investigated with respect to its behaviour in the presence of O2: it reacts the same way as 2." @default.
- W2091707280 created "2016-06-24" @default.
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- W2091707280 date "2006-05-01" @default.
- W2091707280 modified "2023-10-11" @default.
- W2091707280 title "Vanadium calixarene complexes as molecular models for supported vanadia" @default.
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- W2091707280 doi "https://doi.org/10.1016/j.molcata.2006.02.045" @default.
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