Novel substituted thieno[3,2-b]pyran-5,7-diones of the general formula (I) ##STR1## Processes for their preparation and their use as herbicides and as plant growth regulators and novel intermediates of the formula (VI) ##STR2## (in which R.sup.1, R.sup.2, X, Y and Z have the meaning given in the description).
小说替代通式(I)的
噻吩[3,2-b]
吡喃-5,7-二酮。##STR1## 它们的制备方法以及它们作为
除草剂和
植物生长调节剂的用途和通式(VI)的新中间体。##STR2## (其中R.sup.1,R.sup.2,X,Y和Z的含义如说明中所述)。