| abstract |
New 2-phenyl-5,6-dihydro-4-pyrone derivatives and herbicidal compositions in which they are present. They correspond to the general formula: <IMAGE> in which: R1 and R2, which are identical or different, represent a hydrogen atom or an alkyl radical (C1-C4), or together form an alkylene chain (C2-C6), R3 represents an alkyl radical (C1-C4), an alkenyl radical (C2-C4), an alkynyl radical (C2-C4), a halogenoalkyl radical (C1-C4) or an alkoxyalkyl radical (C3-C5), Y represents a halogen atom, an alkyl radical (C1-C4) or an alkoxy radical (C1-C4), 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. |