Ynolates were found to react with alpha-alkoxy-, alpha-siloxy-, and alpha-aryloxyketones at room temperature to afford tetrasubstituted olefins with high Z selectivity. Since the geometrical selectivity was determined in the ring opening of the beta-lactone enolate intermediates, the torquoselectivity was controlled by the ethereal oxygen atoms. From experimental and theoretical studies, the high Z
The Mukaiyama reaction of ketene bis(trimethylsilyl) acetals with α-halo acetals
作者:F.W.J. Demnitz
DOI:10.1016/s0040-4039(01)93317-9
日期:——
Ketene bis(trimethylsilyl) acetals were reacted with α-halo acetals giving β-alkoxy-γ-halo acids which were converted to butenolides by reaction with two equivalents of base. This constitutes a novel and short butenolide synthesis.
Endophyte enhanced seedlings with increased pest tolerance
申请人:IRVING LICENSING, INC.
公开号:US10674699B2
公开(公告)日:2020-06-09
The invention provides methods for preparing a conifer seedling with increased tolerance to a pest. A conifer seedling is inoculated with an isolated endophyte when the conifer seedling is susceptible to colonization by the endophyte.