Process for producing conjugated dienes containing a cyano group
AssigneeToyo Soda Manufacturing Co., Ltd.
InventorsYuji Nonaka, Keiichi Kihara, Toshio Hironaka, Yasuhiro Oda
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Abstract
Conjugated dienes containing a cyano group having the formula ##EQU1## wherein R.sub.1 and R.sub.2 represent hydrogen atom, an alkyl group or a phenyl group are produced by dehydrating 2-cyano-3-hydroxy-1-olefins in the presence of an alkaline catalyst while continually removing the product being formed from the reaction system.
Claims7
A process for producing a conjugated diene containing a cyano group having the formula ##EQU9## wherein R.sub.1 and R.sub.2 are hydrogen, C.sub.1 to C.sub.10 alkyl or phenyl which comprises dehydrating the 2-cyano-3-hydroxy-1-olefin compound of the formula ##EQU10## wherein R.sub.1 and R.sub.2 are as before at 50.degree.-200.degree.C under a reduced pressure of 1 to 600 mm Hg in the presence of an alkaline catalyst wherein the amount of said alkaline catalyst is 0.1-20 weight percent relative to said 2-cyano-3-hydroxy-1-olefin and said conjugated diene is continuously removed by distillation from the reaction system during reaction.
A process for producing a conjugated diene containing a cyano group having the formula:
- ##EQU11## wherein R.sub.1 and R.sub.2 are hydrogen, C.sub.1 to C.sub.10 alkyl or phenyl which comprises dehydrating in the gas phase the 2-cyano-3-hydroxy-1-olefin of the formula ##EQU12## wherein R.sub.1 and R.sub.2 are as above, at 200.degree.-600.degree.C by passing a said 2-cyano-3-hydroxy-1-olefin over a solid alkaline catalyst wherein said alkaline catalyst is 0.1-20 weight percent relative to said 2-cyano-3-hydroxy-1-olefin.
Dependencies are inferred from the claim text.