申请人:NATIONAL UNIVERSITY CORPORATION KOBE UNIVERSITY
公开号:US20210403409A1
公开(公告)日:2021-12-30
The objective of the present invention is to provide a method for producing a polycarbonate safely and efficiently even without using a base. The method for producing a carbonate derivative according to the present invention is characterized in comprising the step of irradiating a high energy light to a composition comprising the halogenated methane and the hydroxy group-containing compound in the presence of oxygen, wherein a molar ratio of a total usage amount of the hydroxy group-containing compound to 1 mole of the halogenated methane is 0.05 or more.
NMR determination of the absolute configuration of chiral 1,2- and 1,3-diols
作者:Hiroki Fukui、Yukiharu Fukushi、Satoshi Tahara
DOI:10.1016/s0040-4039(03)00845-1
日期:2003.5
1,2- and 1,3-diols examined was derivatized exclusively to a single diastereomeric acetal by the use of a new axially chiral reagent, 2′-methoxy-1,1′-binaphthalene-8-carbaldehyde (MBC). The absoluteconfiguration of the original 1,2- and 1,3-diols was determined by the NOE correlation between the proton signals of the reagent moiety and those of the diol moiety in the acetals.
Rapid Cyclic Acetal and Cyclic Ketal Synthesis Assisted by a Rotary Evaporator
作者:Fuyao Jiang、Yinzhe Chen、Qian Zhang、Weiding Wang
DOI:10.1055/a-2293-3243
日期:2024.11
Herein, we present a rapid and efficient method for synthesizing cyclicacetals and ketals utilizing a rotary evaporator. Unlike the conventional Dean–Stark dehydration process, which typically demands extended reaction times and copious amounts of organic solvents, our approach affords the synthesis of cyclicacetals and ketals with varying ring sizes in 30 min while using minimal quantities of dimethyl
Reaction of 2-aryl-1,3-dioxane with arenes in the presence of a catalytic amount of trifluoromethanesulfonic acid gave the corresponding diarylmethanes in good to excellent yields. The acid-catalyzed Friedel-Crafts benzylation of arenes could altenatively be carried out using arenecarbaldehyde and 1,3-propanediol. The reaction was assumed to proceed through a redox process involving hydride shift from the cyclic acetal moiety to the benzylic carbon. The hydride shift was confirmed by the reaction with 5-ethyl-2-phenyl-4,4,6,6-tetradeuterio-1,3-dioxane, wherein more than 90% deuterium was incorporated into the benzylic carbon of the diphenylmethane. Diphenylmethyl ether Ph(2)CHOCH(2)CH(2)CH(2)OH also reacted with benzene to afford diphenylmethane under the same reaction conditions, suggesting that the ether should be the plausible intermediate that underwent the hydride shift.