| 摘要 |
This is a process for preparing cyanoacetic acid (CAA) or its esters by further oxidizing a partially oxidized propionitrile compound of the following formula: N}C-CHx-CHy-AB, where A is -H, -OH, or -OR; and B is -OH, -OR, or = O; x=1 or 2, y=0 or 1 (depending upon the selection of A and B); but where B is =O, A is -H, and x=0; and where y=1, x=0, B is -OH or -OR. Especially preferred partially oxidized propionitrile compounds include cyanoacetaldehyde (CA), its hydrate (CAH) or acetal (CADA). Suitable oxidants include oxygen, ozone, hydrogen peroxide, peracids, nitrites, and the like. The partially oxidized propionitrile compound is preferably produced from acrylonitrile. An optional step is the esterification of the cyanoacetic acid. |
