Chiral Carbonates Research Articles

ChemInform Abstract: Direct Transformation of 2,3‐Epoxy Alcohols into Hydroxy Carbonates Under Mildly Basic Conditions.

AbstractVarious optically active (hydroxyalkyl)oxiranes are treated with cesium carbonate in a carbon dioxide (II) atmosphere, forming chiral cyclic hydroxy carbonates.

Asymmetric Carbon Dioxide Fixation into Optically Active Propylene Carbonate by the Reactions of Propylene Bromohydrins

Abstract Asymmetric carbon dioxide fixation was achievd by the cyclization of propylene bromohydrins into chiral propylene carbonate of 38% enantiomeric excess in the presence of a chiral cobalt salen type complex.

Bifunktionelle Katalysatoren zur Synthese cyclischer Carbonate aus Oxiranen und Kohlendioxid

Preparation of Cyclic Carbonates from Oxiranes and Carbon Dioxide in the Presence of Bifunctional CatalystsMixtures of metal halides and alkylammonium iodides catalyze the synthesis of cyclic carbonates 2 from oxiranes and carbon dioxide at room temperature and atmospheric pressure. The chemoselective reaction proceeds smoothly with mono‐substituted oxiranes while 1,2‐disubstituted substrates are inert. By the use of chiral oxiranes the reaction opens a simple access to chiral carbonates like (R)‐ and (S)‐4‐(chloromethyl)‐1,3‐dioxolan‐2‐one (2c). Insertion of carbon dioxide into the CO bond occurs with retention of configuration and with optical yields of 73 – 98%.