中国科技论文在线

上传时间

2006年11月03日

【期刊论文】Molybdenum(VI) cis-Dioxo Complexes with Chiral Schiff Base Ligands: Synthesis, Characterization, and Catalytic Applications

周向葛， Xiangge Zhou， Jin Zhao， Ana M. Santos， and Fritz E. Kuhn

Z. Naturforsch. 59b, 1223-1228(2004)，-0001，（）：

-1年11月30日

摘要

Three optically active Molybdenum (VI) dioxo complexes with tetrahydro salen and substituted tetrahydro salen derivatives as ligands were synthesized and examined as catalysts for asymmetric epoxidation. Complexes of the type MoO2(L)(Solv) and WO2(L) (L=tridentate, trans-2-aminocyclohexanol derived chiral Schiff base, Solv=alcohol) were prepared and characterized by elemental analysis, NMR and IR spectroscopy. These complexes are applicable as catalysts for olefin epoxidation reactions with tert-butyl hydroperoxide (TBHP) being the oxidizing agent. In case of cis-β-methylstyrene moderate enantiomeric excesses of up to 26% can be reached when the reaction is carried out at 0℃.

Catalysis， Chirality， Epoxidation， Molybdenum， Salen

34浏览
0点赞
0收藏
0分享
562下载
0

引用

上传时间

2006年11月03日

【期刊论文】Asymmetric aldol reactions catalyzed by new spiro diamine derivatives

周向葛， Man Jiang， a， Shou-Fei Zhu， b， Yun Yang， Liu-Zhu Gong， c， Xiang-Ge Zhoua， * and Qi-Lin Zhoub， *

Tetrahedron: Asymmetry 17(2006)384-387，-0001，（）：

-1年11月30日

摘要

Two new organocatalysts derived from L-proline and a novel chiral spiro diamine bearing a C2 symmetric backbone, were introduced for an asymmetric aldol reaction in moderate to good asymmetric induction in up to 76% ee and high yields.

42浏览
0点赞
0收藏
0分享
129下载
0

引用

上传时间

2006年11月03日

【期刊论文】Chlorinated Phthalocyanine Iron(II) Complex Catalyzed Oxidation of Alkanes and Alkenes with Molecular Oxygen in the Presence of Acetaldehyde

周向葛， Shun-Ichi Murahashi， *， a， b， Xiang-Ge Zhou， Naruyoshi Komiya a

Synlett 2003, No.3, 321-324，-0001，（）：

-1年11月30日

摘要

Chlorinated phthalocyanine iron (II) complex is an excellent catalyst for the oxidation of alkanes and alkenes with molecular oxygen in the presence of acetaldehyde under O2 (1 atm) at room temperature. The catalyst can be easily separated and reused for the next reaction.

oxidations， molecular oxygen， alkanes， iron phthalocyanine catalyst

51浏览
0点赞
0收藏
0分享
431下载
0

引用

上传时间

2006年11月03日

【期刊论文】Amidation of Saturated C-H Bonds Catalyzed by Electron-Deficient Ruthenium and Manganese Porphyrins. A Highly Catalytic Nitrogen Atom Transfer Process

周向葛， Xiao-Qi Yu， Jie-Sheng Huang， Xiang-Ge Zhou， and Chi-Ming Che*

Org. Lett., Vol. 2, No.15, 2000，-0001，（）：

-1年11月30日

摘要

Amidation of a variety of hydrocarbons with PhIdNTs catalyzed by ruthenium and manganese meso-tetrakis(pentafluorophenyl)porphyrins 1 and 2 afforded N-substituted amides in up to 92% yields with good to excellent substrate conversions. By employing catalyst 2, exceptionally high turnovers (up to 2600) were achieved, and the amidations can be effected by directly using PhI(OAc)2/NH2R as amidating reagents; in the case of R) COCF3 a direct amination was realized in up to 90% yield.

0浏览
0点赞
0收藏
0分享
108下载
0

引用

上传时间

2006年11月03日

【期刊论文】Reactions of [{m-h2-C(R1) CHR2}(m-CO)Fe2(CO)6] with (m-S2)Fe2(CO)6: synthesis and structures of [m-h2-C(R1) CHR2](m-RS)[Fe2(CO)6]2(m4-S) (R alkyl, phenyl or acyl)

周向葛， Zhong-Xia Wang a， *， Hui Zhao a， Zhong-Yuan Zhou b， Xiang-Ge Zhou b

Journal of Organometallic Chemistry 595(2000)158-165，-0001，（）：

-1年11月30日

摘要

The reaction of [{m-h2-C(R1) CHR2}(m-CO)Fe2(CO)6] with (m-S2)Fe2(CO)6 forms (m3-S)2Fe3(CO)9 (1) and:or anionic intermediates [{m-h2-C(R1) CHR2}(m-S){Fe2(CO)6}2(m4-S)] (2) depending on the substituents R1 and R2. The actions of the anionic complexes 2 with alkyl halides, PhN2BF4 and acid chlorides give [m-h2-C(R1) CHR2](m-RS)[Fe2(CO)6]2(m4-S) (R alkyl, Ph or acyl). The structures of (m-h2-CH CHPh](m-CH2 CHCH2S)[Fe2(CO)6]2(m4-S)

Iron， Alkenyl ligand， Bridging-sulfur ligand， Complexes， Synthesis， Structures

0浏览
0点赞
0收藏
0分享
103下载
0

引用