giving selectively the erythro α-alkyl-β-alkoxyaldehyde, and (Z)-acetal leading preferentially to the threo isomer, is observed in the 1,3-O- to - C-alkyl migration reaction of 1-alkenyl alkyl acetals catalyzed by boron trifluoride etherate.
显着的diastereoselection,用(E) -烯基烷基
缩醛给予选择性地将赤α-烷基-β-alkoxyaldehyde,和(Z)-acetal优先通向苏式异构体,在1,3-O-对观察- C-
三氟化硼醚化物催化的1-链烯基烷基
缩醛的烷基迁移反应。