Chemoselective oxidation of 2-thiomethyl-4,6-dimethyl-pyrimidine and 2-thiobenzyl-4,6-dimethyl-pyrimidine over titania-silica catalysts

被引:9
作者
Radu, DC
Pârvulescu, VI
Câmpeanu, V
Bartha, E
Jonas, A
Grange, P
机构
[1] Univ Bucharest, Dept Chem Technol & Catalysis, Bucharest 70346, Romania
[2] Ctr Organ Chem, Bucharest 71141, Romania
[3] Acad Romana, Inst Phys Chem, Bucharest, Romania
[4] Univ Catholique Louvain, Unite Catalyse & Chim Mat Divises, B-1348 Louvain, Belgium
关键词
titania-silica catalysts; sulfoxidation; 2-thiomethyl-4,6-dimethyl-pyrimidine; 2-thiobenzyl-4,6-dimethyl-pyrimidine; SAXS; XPS;
D O I
10.1016/S0926-860X(02)00508-2
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Mixed oxides titania-silica catalysts (3 wt.% TiO(2)) were prepared using the sol-gel technique. The catalysts were characterized using adsorption-desorption isotherms of N(2) at 77 K, XRD, SAXS, UV-Vis, FTIR and XPS. They were tested in sulfoxidation of 2-thiomethyl-4,6-dimethyl-pyrimidine and 2-thiobenzyl-4,6-dimethyl-pyrimidine in presence of H(2)O(2). The catalysts were used as such or after modification with L(+)-tartaric or R(-)-alpha-metoxyphenylacetic acid at 373 K. The chemoselectivity was found to be influenced by the solvent, properties of catalyst and nature of the substrate. The enantiomeric excess (e.e.) obtained using modified catalysts was lower than 30%. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:77 / 84
页数:8
相关论文
共 27 条
[1]   PHOTOCATALYSIS OVER BINARY METAL-OXIDES - ENHANCEMENT OF THE PHOTOCATALYTIC ACTIVITY OF TIO2 IN TITANIUM SILICON-OXIDES [J].
ANPO, M ;
NAKAYA, H ;
KODAMA, S ;
KUBOKAWA, Y ;
DOMEN, K ;
ONISHI, T .
JOURNAL OF PHYSICAL CHEMISTRY, 1986, 90 (08) :1633-1636
[2]   Spectroscopic characterization of silicalite-1 and titanium silicalite-1 [J].
Astorino, E ;
Peri, JB ;
Willey, RJ ;
Busca, G .
JOURNAL OF CATALYSIS, 1995, 157 (02) :482-500
[3]  
Baiker A, 1996, STUD SURF SCI CATAL, V101, P51
[4]   PYRIMIDINES .2. THE ULTRA-VIOLET ABSORPTION SPECTRA OF SOME MONOSUBSTITUTED PYRIMIDINES [J].
BOARLAND, MPV ;
MCOMIE, JFW .
JOURNAL OF THE CHEMICAL SOCIETY, 1952, (OCT) :3716-3722
[5]   Enantioselective Ti(IV) sulfoxidation catalysts-bearing C3-symmetric trialkanolamine ligands:: Solution speciation by 1H NMR and ESI-MS analysis [J].
Bonchio, M ;
Licini, G ;
Modena, G ;
Bortolini, O ;
Moro, S ;
Nugent, WA .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1999, 121 (26) :6258-6268
[6]   Enantioselective hydrogenations on platinum colloids [J].
Bonnemann, H ;
Braun, GA .
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION IN ENGLISH, 1996, 35 (17) :1992-1995
[7]   HIGHLY ENANTIOSELECTIVE OXIDATION OF SULFIDES MEDIATED BY A CHIRAL TITANIUM COMPLEX [J].
BRUNEL, JM ;
DITER, P ;
DUETSCH, M ;
KAGAN, HB .
JOURNAL OF ORGANIC CHEMISTRY, 1995, 60 (24) :8086-8088
[8]   SCATTERING BY AN INHOMOGENEOUS SOLID .2. THE CORRELATION FUNCTION AND ITS APPLICATION [J].
DEBYE, P ;
ANDERSON, HR ;
BRUMBERGER, H .
JOURNAL OF APPLIED PHYSICS, 1957, 28 (06) :679-683
[9]  
DELMON B, 1998, ELECT MICROSC, V2, P397
[10]  
Enomoto Y., 1985, Jpn. Kokai Tokkyo Koho, Japan. Patent, Patent No. [60161 906, 60161906]