Bifunctional Ionic Liquids for the Multitask Fixation of Carbon Dioxide into Valuable Chemicals
作者:Vitthal B. Saptal、Bhalchandra M. Bhanage
DOI:10.1002/cctc.201501044
日期:2016.1
(i) cycloaddition reactions of CO2/CS2 with epoxides to form cyclic carbonates and 1,3‐oxathiolane‐2‐thiones, (ii) transesterification of cyclic carbonates with methanol to form dimethyl carbonate, and (iii) synthesis of quinazoline‐2,4(1 H,3 H)‐diones and quinazoline‐2,4(1 H,3 H)‐dithiones from 2‐aminobenzonitriles and CO2/CS2. The developed methodology is transition‐metal free, solvent free, and additive free. Remarkably
A simple and novel eco-friendly process for the synthesis of cyclic dithiocarbonates from epoxides and carbon disulfide in water
作者:Azim Ziyaei Halimehjani、Forogh Ebrahimi、Najmedin Azizi、Mohammad R. Saidi
DOI:10.1002/jhet.75
日期:2009.3
The reaction of oxiranes with carbondisulfide for preparation of cyclic dithiocarbonates was carried out in water under catalytic amount of an organic base such as dimethylaminopyridine or triethylamine. The reaction conditions are simple and give high yields of desired products. J. Heterocyclic Chem., 46, 347 (2009).
An equimolar reaction of 2-hexyloxirane with carbon disulfide in hexane was run in the presence of triethylamine under 800 MPa at 100 °C for 20 h, and gave 63% of 4-hexyl-1,3-dithiolan-2-one (3a), 21% of 4-hexyl-1,3-dithiolane-2-thione (1a) and 5% of 5-hexyl-1,3-oxathiolan-2-one (4a). Hexane, benzene, and diisopropyl ether were good solvents for the reaction. The reaction of a variety of oxiranes with
that 1b and 2-hexylthiirane (4b) are produced in the first stage of reaction, and that 2b is then formed by the reaction of 1b or 4b with carbondisulfide. In reactions of a variety of oxiranes with carbondisulfide, 1,3-dithiolane-2-thiones were obtained in high yields under 800 MPa at 100 °C within 20 h. Concerning the effect of substituents in oxiranes, the selectivity for product 2b is in the decreasing