unexpected amount of Ph−Se bond cleavage (35% in n-hexane at 248 nm) during photolysis. Solvent viscosity, wavelength of light, and the structure of alkyl substituents were the major factors that controlled Ph−Se bond cleavage. The ratio of Ph−Se bond cleavage decreased with increasing solvent viscosity and laser wavelength. The effect of alkyl substituents on the ratio of bond cleavages, Ph−Se/total C−Se
Ligandless Iron-Catalyzed Desulfinylative CâC Allylation Reactions using Grignard Reagents and Alk-2-enesulfonyl Chlorides
作者:Chandra M. R. Volla、Dean MarkovicÌ、Srinivas Reddy Dubbaka、Pierre Vogel
DOI:10.1002/ejoc.200900927
日期:2009.12
regioselectivity of these allylations was studied by using sulfonyl chlorides 3 and 4 with aryl Grignard reagents. The scope of these allylations was further extended by the coupling of ester-substituted alk-2-enesulfonylchloride 10 with aromatic Grignard reagents. Symmetrical products were synthesized by double C-C allylation with the use of 2-methylidenepropane-1,3-disulfonyl chloride (12). ((C) Wiley-VCH
Reactions of esters with phosphorus ylides. 3. Direct conversion into branched olefins
作者:Arnold P. Uijttewaal、Froukje L. Jonkers、Arne Van der Gen
DOI:10.1021/jo01332a014
日期:1979.8
Organonickel compounds as reagents for selective carbon-carbon bond formation between unlike groups
作者:Elias J. Corey、Martin F. Semmelhack
DOI:10.1021/ja00987a056
日期:1967.5
An efficient diastereoselective glyoxylate-ene reaction using N-glyoxyloyl camphorpyrazolidinone as an enophile
作者:Jia-Fu Pan、Uppala Venkatesham、Kwunmin Chen
DOI:10.1016/j.tetlet.2004.10.121
日期:2004.12
The diastereoselective glyoxylate-ene reaction of N-glyoxyloyl camphorpyrazolidinone (1) with various alkenes 2a-g in the presence of Lewis acid is described. The corresponding alpha-hydroxyl carbonyls were generally obtained in moderate to high chemical yields (64-87%) and with high levels of diastereoselectivities (up to 94% de). The predominance of products with the S absolute configuration at the newly formed stereogenic center was established by single crystal X-ray analysis and the importance of stereochemical induction is discussed. (C) 2004 Published by Elsevier Ltd.