| 摘要 |
<p>A process for the dimerisation of acrylonitrile to dicyanobutene and methyleneglutaronitrile under the influence of a phosphinite or phosphonite catalyst of the general formula
<Chemistry id="chema01" num="0001"><Image id="ia01" he="14" wi="60" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein at least R<Sub>2</Sub> and optionally also R, and/or R<Sub>3</Sub> are electron-donating substituents (the other significations of R and R<Sub>3</Sub> being given in the description) and R is alkyl or cycloalkyl and m and n are each 1 or 2, provided that (m + n) equals 3, e.g. isopropyl bis-3,4-dimethylphenylphosphinite, uses as solvent a mixture of a proton-donating organic solvent (e.g. isopropanol), an aromatic hydrocarbon solvent (e.g. toluene) and an aliphatic hydrocarbon solvent (e.g. methylcyclohexane), e.g. in the ratio of aromatic hydrocarbon : aliphatic hydrocarbon : proton donating solvent : acrylonitrile of 5 : 5 : 1 : 3, so facilitating the isolation of the products by phase separation or liquid/liquid extraction.</p> |
