| 摘要 |
A continuous process for producing 1,2-alkanediols of the formula <IMAGE> wherein R is a straight-chain or branched-chain alkyl group having 2-10 carbon atoms, comprises reaction of an alkene of the formula R-CH = CH2 wherein R has the meaning defined above, with hydrogen peroxide and formic acid, and subsequent hydrolysis of the formed 1,2-alkanediol monoformate. The process comprises introducing continuously, in controlled amounts, the alkene of the formula II, hydrogen peroxide and formic acid, in a molar ratio of 1.0:1.0-1.5:0.5-10, at 20-100 DEG C into an equilibrium mixture obtained by reaction of these components in the aforementioned molar ratio; simultaneously continuously removing from the reaction mixture the corresponding amount of fully reacted mixture; and isolating from this, after hydrolysis of the formed 1 ,2-alkanediol monoformate, the 1,2-alkanediol of the above formula. The 1 ,2-alkanediols of the above formula can be used as intermediates for producing 1-( beta -arylethyl)- 1H-1,2,4-triazole ketals having an antimicrobial action and an action regulating plant growth. |
