6H-Dibenzo[b,d]pyran-6-one, 6H-benzo[d]naphtho[1,2-b]pyran-6-one, and their derivatives were prepared via the palladium mediated aryl-aryl couplingreaction of aryl ortho-halobenzoate. The short step synthesis of arnottin I(1) was achieved by this method.
Kinetic study of hydrolysis of benzoates. Part XXIV—Variation of theortho substituent effect with solvent in the alkaline hydrolysis of substituted phenyl benzoates
The second-order rate constants k2 (M−1 s−1) for the alkaline hydrolysis of meta-, para- and ortho-substituted phenyl benzoates, C6H5CO2C6H4X, in aqueous 0.5 Mn-Bu4NBr were measured spectrophotometrically. The dependence of substituent effects, especially ortho inductive, resonance and steric terms on different solvent parameters, was studied using the following equation:
在水0.5 M n中,对间,对位和邻位取代的苯甲酸苯酯C 6 H 5 CO 2 C 6 H 4 X 进行碱水解的二级速率常数k 2(M -1 s -1)分光光度法测定-Bu 4 NBr。使用以下方程式研究了取代基效应(尤其是邻位诱导,共振和空间项)对不同溶剂参数的依赖性:
Synthesis of Benzoate-Functionalized Phosphanes as Novel Building Blocks for the Traceless Staudinger Ligation
A new synthetic pathway for the preparation of benzoate-functionalized phosphanes for microwave-mediated traceless Staudinger ligations is described. Novel phosphane derivatives based on 4-substituted iodophenyl benzoates were prepared via palladium(II)-catalyzed P-C cross-coupling reaction strategy in high yields. The application of microwave conditions for the ligation reactions reduced the reaction
Submillisecond organic synthesis: Outpacing Fries rearrangement through microfluidic rapid mixing
作者:Heejin Kim、Kyoung-Ik Min、Keita Inoue、Do Jin Im、Dong-Pyo Kim、Jun-ichi Yoshida
DOI:10.1126/science.aaf1389
日期:2016.5.6
carbon-carbon coupling before one of the reagents can undergo a Friesrearrangement that would shift a neighboring group to the coupling site. Science, this issue p. 691 Bimolecular coupling can outpace a fast unimolecular rearrangement via extremely rapid low-temperature microfluidic mixing. In chemical synthesis, rapid intramolecular rearrangements often foil attempts at site-selective bimolecular functionalization