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15 results on '"Chong Si"'

6. Practical Preparation of 2-Halomethyl-Allyl Carboxylates

Author

Chong Si Sun, Hsiu Yi Cheng, Yu Shiang Lin, and Duen Ren Hou

Subjects
Allylic rearrangement, chemistry.chemical_compound, Acrylate, Malonate, chemistry, Halogen, Organic chemistry, Hydrobromic acid, Hydroxymethyl, General Chemistry
Abstract

An improved, efficient preparation of 2-(halomethyl)allyl carboxylates starting from diethyl bis(hydroxymethyl)malonate and hydrobromic acid is reported. The allylic halogen of 2-(chloromethyl)acrylate and 2-(bromomethyl)acrylate are readily exchanged during esterification.

Published
2008
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7. Direct Formylation of Enol Ethers Using Cyanuric Chloride andN,N-Dimethylformamide

Author

Yun Hsu, Duen Ren Hou, Wu Sian Sie, Jing Yu Jian, and Chong Si Sun

Subjects
Amidine, chemistry.chemical_classification, chemistry.chemical_compound, chemistry, Cyanuric chloride, Enol ether, Organic chemistry, N dimethylformamide, General Chemistry, Enol, Formylation
Abstract

A new method to prepare α,β-unsaturated enol aldehydes is described. 3-Ethoxymethacrolein (1) and 5-formyl-3,4-dihydro-2H-pyran (5) were effectively prepared from enol ethers and the Vilsmeier-Haack type complex, derived from cyanuric chloride and DMF. One byproduct, amidine 4, was also characterized.

Published
2004
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8. ChemInform Abstract: An Efficient Synthesis of 3,4-Dihydropyridone via a Tandem Olefin Isomerization-Ring-Closing Metathesis Reaction

Author

Kevin Robert Fales, Chong Si, Robert D. Boyer, and Njoroge F George

Subjects
Olefin fiber, Ring-closing metathesis, Tandem, Chemistry, Salt metathesis reaction, Organic chemistry, Ring-opening metathesis polymerisation, General Medicine, Chemoselectivity, Isomerization, Acyclic diene metathesis
Abstract

The conversion of N-allyl amides into dihydropyridines proceeds with high regio- and chemoselectivity.

Published
2015
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11. ChemInform Abstract: Asymmetric Synthesis of 4- and 5-Substituted Pipecolic Esters by Ring-Closing Metathesis and Palladium-Catalyzed Formate Reduction

Author

Duen Ren Hou, Chong Si Sun, and Yu Shiang Lin

Subjects
inorganic chemicals, Stereochemistry, organic chemicals, Enantioselective synthesis, food and beverages, chemistry.chemical_element, General Medicine, Metathesis, Medicinal chemistry, Catalysis, chemistry.chemical_compound, Ring-closing metathesis, chemistry, Formate, Palladium
Abstract

Asymmetric synthesis of 4- and 5-substituted pipecolic esters was achieved by the sequence of allylation, ring-closing metathesis, and palladium-catalyzed formate reduction.

Published
2009
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