Jin Uk Han

ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTPalladium-Catalyzed Asymmetric Hydrosilylation of 4-Substituted 1-Buten-3-ynes. Catalytic Asymmetric Synthesis of Axially Chiral AllenylsilanesJin Wook Han, Norihito Tokunaga, and Tamio HayashiView Author Information Department of Chemistry, Graduate School of Science Kyoto University, Sakyo, Kyoto 606-8502, Japan Cite this: J. Am. Chem. Soc. 2001, 123, 51, 12915–12916Publication Date (Web):November 30, 2001Publication History Received22 Septembe

ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTChiral Auxiliary-Directed Asymmetric Ortho-Lithiation of (Arene)tricarbonylchromium ComplexesJin Wook Han, Seung Uk Son, and Young Keun ChungView Author Information Department of Chemistry and Center for Molecular Catalysis, College of Natural Sciences, Seoul National University, Seoul 151-742, Korea Cite this: J. Org. Chem. 1997, 62, 23, 8264–8267Publication Date (Web):November 14, 1997Publication History Received14 July 1997Published online14 November 1

The reaction of organotitanium reagents, methyltitanium triisopropoxide [MeTi(i-PrO)3] and phenyltitanium triisopropoxide [PhTi(i-PrO)3], with aryl triflates and halides proceeded in the presence of 1.0 mol% of palladium catalyst coordinated with (R*)-N,N-dimethyl-1-[(S*)-2-(diphenylphosphino)ferrocenyl]ethyl­amine [(R*)-(S*)-PPFA] in refluxing THF to give a quantitative yield of the corresponding cross-coupling products.

Bis{(Rp)-2-[(1S)-1-methoxyethyl]ferrocenyl}arylphosphines (S,Rp)-9 (aryl=4-MeOC6H4 (9a), Ph (9b), 4-CF3C6H4 (9c), 3,5-(CF3)2C6H3 (9d)), which contain two planar chiral ferrocenyl moieties, were prepared via (Rp)-1-bromo-2-[(1S)-1-methoxyethyl]ferrocene ((S,Rp)-8). Asymmetric hydrosilylation of linear 1,3-dienes such as deca-1,3-diene (10a) with trichlorosilane in the presence of a palladium catalyst coordinated with 9d gave allylic silanes of up to 93% ee.

In the context of the energy crisis and global climate deterioration, the sustainable development of clean energy will become a new direction for future energy development. Based on the development process of clean energy in China in the past ten years, this paper expounds on China’s clean energy policy and development plan. The development of hydropower, wind power, and solar power in China in recent years is analyzed. On this basis, the Grey Forecasting Model is used to forecast the developmen

Gold-catalyzed aerobic oxygenative cleavage of triple bonds that occurs under the ambient pressure of air and at room temperature is reported; radical inhibition tests suggest that oxygenation occurs via a gold-bound metalloradical intermediate.

ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTHighly Porous Polysilsesquioxane Networks via Hydrosilylative Polymerization of Macrocyclic Oligomeric SilsesquioxanesJin Han and Sixun Zheng*View Author Information Department of Polymer Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, P. R. China* To whom correspondence should be addressed: Tel 86-21-54743278 ; Fax 86-21-54741297; e-mail [email protected]Cite this: Macromolecules 2008