申请人:Bayer Aktiengesellschaft
公开号:US05874586A1
公开(公告)日:1999-02-23
Herbicidally active 1-aryl-4-carbamoyl-tetrazolinones of the formula (I) ##STR1## in which Ar represents optionally substituted aryl, R.sup.1 represents in each case optionally substituted alkyl, alkenyl, alkinyl or alkoxy, and R.sup.2 represents in each case optionally substituted alkyl, alkenyl, alkinyl, cycloalkyl, cycloalkylalkyl, aryl or arylalkyl, or, together with R.sup.1, represents alkanediyl, are obtained in good yields and at high purity by reacting 1-aryl-tetrazolinones of the formula (II) with phosgene in the presence of a diluent at temperatures of between 0.degree. C. and 150.degree. C. ("first process step"), and reacting the resulting (novel) 1-aryl-4-chlorocarbonyl-tetrazolinones of the formula (III) with amines of the formula (IV) in the presence of a diluent, and, where appropriate, in the presence of a further basic compound, at temperatures of between -20.degree. C. and +100.degree. C. ("second process step"): ##STR2##
式(I)中,Ar代表可选取代的芳基,R1分别表示可选取代的烷基、烯基、炔基或烷氧基,R2分别表示可选取代的烷基、烯基、炔基、环烷基、环烷基烷基、芳基或芳基烷基,或者与R1一起表示脂肪二基。通过在稀释剂存在下,在0℃至150℃的温度下,将式(II)中的1-芳基-四唑酮与光气反应,可以获得高产率和高纯度的具有除草活性的1-芳基-4-氨基甲酰基-四唑酮。在存在稀释剂的情况下,在-20℃至+100℃的温度下,将所得的新型1-芳基-4-氯甲酰基-四唑酮与式(IV)的胺反应,必要时可以在进一步的碱性化合物存在下进行(“第二步反应”):