- New multi-site phase transfer catalyst for the addition of dichlorocarbene to olefins
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Three step synthesis of a new, water-soluble multi-site phase transfer catalyst (MPTC-I), viz., α,α1,α11- tris(triethyl ammonium methylene bromide) β-hydroxy ethyl benzene is described. The potentiality of MPTC-I is demonstrated by studying kinetic aspects of the reactions, viz. dichlorocarbene addition to styrene, α-methyl styrene and trans-stilbene.
- Shanmugan,Balakrishnan
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p. 1069 - 1074
(2008/02/11)
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- COPOLYESTERAMIDES CONTAINING POLY(ETHYLENE OXIDE) SOFT SEGMENTS AS NEW AND EFFICIENT PHASE-TRANSFER CATALYSTS
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Copolyesteramides, 1, prepared by melt polycondensation of N,N'-bis(4-methoxycarbonylbenzoyl)hexamethylenediamine, 2, 1,6-hexanediol and poly(ethylene glycol) (PEG 1000), are a new class of polymeric phase-transfer catalysts.Their catalytic activity has been tested in nucleophilic aliphatic substitutions, eliminations, alkylations of activated methylene groups, dichlorocyclopropanation of C=C double bonds, reductions of ketones to alcohols and oxydation of primary alcohols to aldehydes.
- Montanari, Fernando,Penso, Michele,Fortuna, Giorgio della,Re, Alberto
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p. 427 - 432
(2007/10/02)
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- THERMAL TRANSFORMATIONS OF GEM-DIHALOGENODIPHENYLCYCLOPROPANES
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When gem-dihalogenodiphenylcyclopropanes are heated, 2-halogenophenylindenes or diphenyl-2-halogeno-1,3-alkadienes are formed.The yields of the substituted indenes are increased in the presence of acidic catalysts, while the yield of the dienes is increas
- Kostikov, R. R.,Varakin, G. S.,Ogloblin, K. A.
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p. 1438 - 1444
(2007/10/02)
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- Synthesis of clyclopropyl analogs of stilbene and stilbenediol as possible antiestrogens.
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Conformationally rigid analogs of stilbene and stilbenediol were prepared via gem-dichlorocyclopropyl precursors utilizing two different synthetic methods: a two-phase catalytic method and an organomercurial method. These precursors were reduced to the corresponding cyclopropyl analogs using sodium and methanol. All compounds are being tested to discriminate between estrogenic and antiestrogenic ability, to determine estrogen binding ability, and to evaluate tissue culture anticancer activity.
- Magarian,Benjamin
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p. 1626 - 1632
(2007/10/12)
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