Synthesis of dihalohydrins and tri- and tetra-substituted olefins
申请人:Board of Regents, The University of Texas System
公开号:US20040143125A1
公开(公告)日:2004-07-22
A novel synthesis reaction for highly stereospecific tri- and tetra-substituted olefins is described. A single stereoisomer of stable &agr;-halo-&agr;,&bgr;-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.
A process for the preparation of indanones of the formula II from indanones of the formula I or of indanones of the formula IIa from indanones of the formula Ia
1
comprises reacting an indanone of the formula I or Ia with a coupling component.