申请人:Philagro
公开号:US04316737A1
公开(公告)日:1982-02-23
New 2-phenyl-5,6-dihydro-4-pyrone derivatives and herbicidal compositions in which they are present. They correspond to the general formula: ##STR1## in which: R.sub.1 and R.sub.2, which are identical or different, represent a hydrogen atom or an alkyl radical (C.sub.1 -C.sub.4), or together form an alkylene chain (C.sub.2 -C.sub.6), R.sub.3 represents an alkyl radical (C.sub.1 -C.sub.4), an alkenyl radical (C.sub.2 -C.sub.4), an alkynyl radical (C.sub.2 -C.sub.4), a halogenoalkyl radical (C.sub.1 -C.sub.4) or an alkoxyalkyl radical (C.sub.3 -C.sub.5), Y represents a halogen atom, an alkyl radical (C.sub.1 -C.sub.4) or an alkoxy radical (C.sub.1 -C.sub.4), and n represents an integer which can be equal to 1, 2 or 3, with the proviso that, when n is equal to 2 or 3, the radicals Y can be identical or different. These compounds can be used for selectively destroying weeds in crops such as sunflower, cotton, soft wheat, rice, soya bean, groundnut, bean and tomato plant.
新的2-苯基-5,6-二氢-4-吡喃衍生物及其在除草剂组合物中的存在。它们对应于以下通式:##STR1##其中:R.sub.1和R.sub.2相同或不同,表示氢原子或烷基(C.sub.1-C.sub.4),或者一起形成烷基链(C.sub.2-C.sub.6),R.sub.3表示烷基(C.sub.1-C.sub.4),烯基(C.sub.2-C.sub.4),炔基(C.sub.2-C.sub.4),卤代烷基(C.sub.1-C.sub.4)或烷氧基烷基(C.sub.3-C.sub.5),Y表示卤原子,烷基(C.sub.1-C.sub.4)或烷氧基(C.sub.1-C.sub.4),n表示可以等于1、2或3的整数,但当n等于2或3时,基团Y可以相同或不同。这些化合物可用于选择性地破坏作物中的杂草,如向日葵、棉花、软麦、稻谷、大豆、花生、豆类和番茄植物。