Thienopyrimidines of the formula: ##STR1## wherein R.sup.1 is straight or branched chain alkyl containing from 3 to 11 carbon atoms and optionally substituted with cyano or methoxy, cycloalkyl, benzyl optionally substituted on the .alpha. carbon atom with a lower alkyl group or in the ring with one or more alkoxy groups or halogen atoms, dimethylamino, phenylethyl optionally substituted at the .alpha.- or .beta.-carbon atoms with a lower alkyl group, tetrahydrofurfuryl; R.sup.3 is hydrogen or NH.sub.2 ; or R.sup.1 and R.sup.3 together form a carbon chain bridging group optionally saturated and containing one or more nitrogen atoms; R.sup.2 is hydrogen, methyl, ethyl, or chlorine; R.sup.5 is hydrogen or methyl; and R.sup.6 is hydrogen, methyl or acetylamino; or an optical isomer thereof; or a tautomer thereof; or a salt thereof. These and other thienopyrimidines are disclosed as useful for plant growth regulation and for combating fungal, viral and bacterial diseases of plants and insect pests.
式为:##STR1##其中R.sup.1是直链或支链烷基,含有3到11个碳原子,并可选择地取代为
氰基或甲氧基,环烷基,苄基,可选择地在α-碳原子上取代为较低的烷基或在环中含有一个或多个烷氧基或卤素原子,
二甲氨基,苯乙基,可选择地在α-或β-碳原子上取代为较低的烷基,
四氢呋喃基;R.sup.3是氢或NH.sub.2;或R.sup.1和R.sup.3一起形成一个碳链桥接基,可选择饱和并含有一个或多个氮原子;R.sup.2是氢,甲基,乙基或
氯;R.sup.5是氢或甲基;R.sup.6是氢,甲基或乙酰
氨基;或其光学异构体;或其互变异构体;或其盐。这些及其他噻
吡嘧啶被披露为用于植物生长调节和对抗植物真菌、病毒和细菌病害以及昆虫害虫的有用化合物。