Palladium-catalyzed reactions of ketone .alpha.-carbonates with norbornenes. An unusual cyclopropanation
摘要:
In the presence of a palladium(0) catalyst, ketone alpha-carbonates react with norbornene to give a cyclopropane derivative via an oxa-pi-allylpalladium intermediate.
Rhodamine spirolactam sensors operated by sulfur-cooperated metal complexation
作者:Gisuk Heo、Dahye Lee、Chi Gwan Kim、Jung Yun Do
DOI:10.1016/j.saa.2017.07.019
日期:2018.1
New rhodamine Schiff base sensors were developed to improve selective sensing by introducing sulfide, ester, and dithiocarbonate groups, as well as using ketones coupled to rhodamine-hydrazine. Metal sensing proceeded through the 1:1 complexation of the metal ion for most sensors in the presence of Cu2+ and Hg2+. A sensor carrying a dithiocarbonate group responded selectively to Hg2+ showing a strong colorimetric change and intense fluorescence. The association constants of the sensors were determined from a linear plot performed at micro-molar concentrations to afford values in the range of 10(4). Sensing was interrupted at the initial time of Hg2+ exposure due to the isomerization of imine and preferential metal bonding of two dithiocarbonate groups regardless of the main structure of rhodamine. The sensors exhibited the reversible and reproducible performance for Hg2+ sensing. (C) 2017 Elsevier B.V. All rights reserved.
WO2008/34685
申请人:——
公开号:——
公开(公告)日:——
Reaction of carbon dioxide with propargyl alcohol catalyzed by a combination of Ru3(CO)12 and Et3N
作者:Yoshiyuki Sasaki
DOI:10.1016/s0040-4039(00)84316-6
日期:1986.1
SASAKI, YOSHIYUKI, TETRAHEDRON LETT., 1986, 27, N 14, 1573-1574
作者:SASAKI, YOSHIYUKI
DOI:——
日期:——
[EN] METHOD OF PRODUCTION OF ENANTIOMER-ENRICHED ALKYLENE CARBONATES<br/>[FR] PROCÉDÉ DE FABRICATION DE CARBONATES D'ALKYLÈNE ENRICHIS EN ÉNANTIOMÈRES
申请人:EVONIK DEGUSSA GMBH
公开号:WO2008034685A1
公开(公告)日:2008-03-27
[EN] The invention relates to a method of production of enantiomer-enriched alkylene carbonates (I), in particular (R)-propylene carbonate (I), by enantioselective enzymatic reduction of an O- substituted hydroxyacetone of type (II) and subsequent cyclization of the alcohol formed of type (III) and compounds of formula (III) and their regioisomers (IV). [FR] L'invention concerne un procédé de fabrication de carbonates d'alkylène enrichis en énantiomères (I), notamment de carbonate de (R)-propylène (I), par réduction enzymatique énantiosélective d'une hydroxyacétone O-substituée de type (II) et cyclisation ultérieure de l'alcool formé de type (III) et de composés de formule (III) et leurs régioisomères (IV).