Publication Type Journal Article
Title New salan and salen vanadium complexes: Syntheses and application in sulfoxidation catalysis
Authors Minaxi S. Maru Sonia Barroso Pedro Adão Luis G. Alves Ana M. Martins
Groups BIOIN IOARC
Journal JOURNAL OF ORGANOMETALLIC CHEMISTRY
Year 2018
Month September
Volume 870
Number
Pages 136-144
Abstract New diamine bis-phenol compounds of salan-(HOPh CHNH(CH2)(2)NHCHPh OH, Ph = 2,4-(CMe2Ph) C6H2, H(2)L1) and salen-type (HOPh CHN(CHPh)(2)NCHPh OH, Ph = 2,4-(BuC6H2)-Bu-t, H2L2 and HOPh CHN(1,1 -2-binaphthyl) NCHPh OH, Ph = 2,4-(BuC6H2)-Bu-t, H(2)L3), as well as their oxido vanadium derivatives are described. VO((OPr)-Pr-i) 3 was used as starting material for the preparation of [VO((OPr)-Pr-i)(L1)], 1, [VO((OPr)-Pr-i)(L2)], 3, and (mu-O)\[VO((OPr)-Pr-i)(m-O)(L-3)VO]\(2), 5. An intramolecular redox process involving the reduction of V(V) to V(IV) converts 3 into [VO(L2)], 4. The reactions of 1 and 5 with Me3SiCl give [VOCl(L1)], 2, and [VOCl(L3)], 6, respectively. All complexes were tested as catalysts for the sulfoxidation of thioanisole using H2O2 as oxidant. In general, the compounds display high activity and selectivity, although salantype complexes (1 and 2) perform better. Comparison of complexes 5 and 6 shows that the monomeric species is more active and selective. Well-defined complexes, 5 and 6, display better catalytic performance than systems using 1:1.5 [VO(acac)(2)] and H(2)L3. (C) 2018 Published by Elsevier B.V.
DOI http://dx.doi.org/10.1016/j.jorganchem.2018.06.011
ISBN
Publisher
Book Title
ISSN 0022-328X
EISSN 1872-8561
Conference Name
Bibtex ID ISI:000438484600018
Observations
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