Abstract
Treatment of aldehydes with sulfur ylide (CH<sub>2</sub>=SOMe<sub>2</sub> or CH<sub>2</sub>=SMe<sub>2</sub>), in the presence of CO<sub>2</sub> (1 atm) bubbled sequentially under mild conditions, produces cyclic carbonates in preparative yields. Sodium iodide formed in situ promotes the reaction between epoxide as intermediate and CO<sub>2</sub> at ambient conditions, thus constituting a powerful metal-free synthesis of organic cyclic carbonates directly from aldehydes.
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