Asymmetric sulfoxidation of prochiral sulfides using aminoalcohol derived chiral C3-symmetric trinuclear vanadium Schiff base complexes
摘要:
A series of trimeric variants of the efficient and well known Bolm's chiral vanadium salen catalysts are reported. These C-3-symmetric trinuclear chiral Schiff bases were synthesized by condensing a variety of trialdehydes with optically active aminoalcohols. The catalytic activity of the chiral vanadium complexes of these ligands was investigated for the enantio selective oxidation of prochiral sulfides using hydrogen peroxide as an oxidant. The procedure afforded the corresponding sulfoxide in good yield and the enantioselectivities were comparable to those obtained with the mononuclear complexes. (c) 2007 Elsevier Ltd. All rights reserved.
TRIS(FORMYLPHENYL) AND NEW POLYNUCLEAR POLYPHENOL DERIVED THEREFROM
申请人:Yoshitomo Akira
公开号:US20100099908A1
公开(公告)日:2010-04-22
A novel tris(formylphenyl) according to the following general formula and polynuclear phenol derived therefrom, which are useful as a material for heat resistant materials, material for photosensitive resist compositions, epoxy resin material or hardener, developer or anti-fade agent for thermosensitive recording materials, or sterilizer, fungicide, antioxidant, etc:
In the formula, Y represents a hydrogen atom or —R
2
COOR
3
group, R
2
represents a monocyclic or condensed cyclic aromatic hydrocarbon group with a carbon atom number of 6 to 15 or an aliphatic hydrocarbon group with a carbon atom number of 1 to 8 that may have in its main chain a monocyclic or condensed cyclic aromatic hydrocarbon group with a carbon atom number of 6 to 15, and R
3
represents a hydrogen atom or alkyl group with a carbon atom number of 1 to 6. R
1
s may be the same or different and respectively represent a hydrogen atom, alkyl group with a carbon atom number of 1 to 8 or alkoxyl group with a carbon atom number of 1 to 8. R
B
and R
C
may be the same or different, where R
A
, R
B
and R
C
respectively represent a hydrogen atom or alkyl group with a carbon atom number of 1 to 6 and n and m are respectively an integer of 0 or 1 to 3.
condensation polymer was obtained by the reaction of 1,3,5-tris[(5-tert-butyl-3-formyl-4-hydroxyphenyl)ethynyl]benzene (1) with ethylenediamine. Solid-state 13C1H} CP/MAS NMR analysis showed that the polymer was pure and highly cross-linked and powder synchrotron X-ray diffraction indicated some degree of local structural order in the polymer. A chiral manganese−salen-bridged polymer was obtained
METHOD FOR PRODUCING NEW POLYNUCLEAR POLY(FORMYLPHENOL)
申请人:Yoshitomo Akira
公开号:US20090182175A1
公开(公告)日:2009-07-16
Produce the target substance, or a polynuclear poly(formylphenol) expressed by General Formula (2), in an industrial setting with ease and at high purity by causing a polynuclear poly(hydroxymethylphenol) or polynuclear poly(alkoxymethylphenol) to react with hexamethylene tetramine in the presence of an acid and then hydrolyzing the obtained reaction product.
Asymmetric sulfoxidation of prochiral sulfides using aminoalcohol derived chiral C3-symmetric trinuclear vanadium Schiff base complexes
作者:Paulsamy Suresh、Sankareswaran Srimurugan、Balaji Babu、Hari N. Pati
DOI:10.1016/j.tetasy.2007.11.005
日期:2007.11
A series of trimeric variants of the efficient and well known Bolm's chiral vanadium salen catalysts are reported. These C-3-symmetric trinuclear chiral Schiff bases were synthesized by condensing a variety of trialdehydes with optically active aminoalcohols. The catalytic activity of the chiral vanadium complexes of these ligands was investigated for the enantio selective oxidation of prochiral sulfides using hydrogen peroxide as an oxidant. The procedure afforded the corresponding sulfoxide in good yield and the enantioselectivities were comparable to those obtained with the mononuclear complexes. (c) 2007 Elsevier Ltd. All rights reserved.