申请人:Bayer Aktiengesellschaft
公开号:US04581175A1
公开(公告)日:1986-04-08
N'-Acylhydrazine-N-thiocarboxylic acid O-carbamoylmethyl esters of the formula ##STR1## in which R.sup.1 is alkyl, alkoxy, alkylthio, halogenoalkyl, aralkyl, aralkoxy, aralkylthio or optionally substituted aryl, and R.sup.2 and R.sup.3 each independently is hydrogen, alkyl, alkenyl, alkinyl, optionally substituted cycloalkyl or cycloalkenyl, halogenoalkyl, alkoxyalkyl, alkoxy, aralkyl or optionally substituted aryl, or R.sup.2 and R.sup.3, together with the nitrogen atom to which they are bonded, are an optionally substituted heterocyclic radical, are new compounds useful in preparing known thiadiazole herbicides in high yield by ring closure.
式为##STR1##的N'-酰基肼-N-硫代羧酸O-氨甲酰甲酯,其中R1为烷基,烷氧基,烷硫基,卤代烷基,芳基烷基,芳基烷氧基,芳基烷硫基或可选取代芳基;R2和R3各自独立地为氢,烷基,烯基,炔基,可选取代的环烷基或环烷烯基,卤代烷基,烷氧基烷基,烷氧基,芳基烷基或可选取代芳基,或R2和R3与它们结合的氮原子一起是可选取代的杂环基,这些新化合物可用于通过环闭合高产制备已知的噻二唑类除草剂。