专利号:US-7084281-B2 优先权日:2003-01-22 标题:Synthesis of dihalohydrins and tri- and tetra-substituted olefins 发明人:FALCK JOHN R; BARMA DEB K; KUNDU ABHIJIT 权利人:UNIV TEXAS 摘要:A novel synthesis reaction for highly stereospecific tri- and tetra-substituted olefins is described. A single stereoisomer of stable α-halo-α,β-ester is produced in high yield by the reaction of aldehyde or ketone with a trihalogenated compound such as trichloroacetate in the presence of CrCl 2 in a solvent. By varying the amount of CrCl 2 used, the stable dihalohydrin intermediate may be obtained as well.
专利号:US-2004143125-A1 优先权日:2003-01-22 标 题 :Synthesis of dihalohydrins and tri- and tetra-substituted olefins