Abstract:
Compounds of the formula ##STR1## in which (R).sub.n is hydrogen, halogen, CF.sub.3, NO.sub.2, CN, alkyl, alkoxy or alkylthio,A is O, S, NH, or N-alkyl,R.sub.1 is hydrogen or alkyl andZ is a carboxylic acid, carboxylic ester, thiol ester, carbonamide, carbohydrazide, thioamide, nitrile, hydroxymethyl, acyloxymethyl, carbamoylmethyl, or sulfonyloxymethyl group,Are valuable herbicides for the selective control of weed grasses. The novel compounds are prepared by known methods, for example by reacting halo-benzthiazoles, -benzoxazoles or -benzimidazoles with unilaterally etherified hydroquinones.
Abstract:
A compound of the formula ##STR1## is reacted with a phenol of the formula ##STR2## in the presence of an acid to produce a heterocyclic phenyl ether of the formula ##STR3## wherein each R is independently selected from halogen, trifluoromethyl, nitro, cyano, alkyl having 1 to 4 carbon atoms, alkoxy having 1 to 4 carbon atoms or alkylthio having 1 to 4 carbon atoms;A is oxygen, sulfur or N-alkyl having 1 to 4 carbon atoms; andn is a number from 0 to 3.
Abstract:
The compounds of the formula (I) ##STR1## in which R.sup.1 denotes (C.sub.1 -C.sub.3)alkyl and R.sup.2 denotes H, methyl or halogen, and salts thereof have excellent actions as plant growth regulators, in particular in rice crops.
Abstract:
Preparation of 5- and 6-halo-2-mercaptobenzoxazoles or the sodium and potassium salts thereof by reaction of corresponding 4- or 5-halo-2-aminophenols with sodium or potassium lower alkyl xanthates in heterogeneous phase.
Abstract:
The preparation of (optionally substituted) 2-mercaptobenzothiazole by reaction of corresponding 2-halogenoanilines with an alkali metal xanthate or alkaline earth metal xanthate or with CS.sub.2 in the presence of bases.
Abstract:
The compounds of the formula I ##STR1## wherein R denotes (substituted) phenyl, (substituted) cyclohexyl or (substituted) cyclohexenyl,X denotes a radical of the formulae ##STR2## Y denotes a radical of the formulae ##STR3## and the bisulfite adducts, acetals, ketals, thioacetals or thioketals derived from ##STR4## Z denotes O, S or N--R.sup.8, m denotes 0, 1 or 2, n denotes 0, 1, 2, 3, or 4 and p denotes 2 or 3,and their salts and quaternization products which are acceptable for agricultural purposes possess advantageous plant growth-regulating actions.
Abstract:
Heterocyclic phenyl ethers of the formula ##STR1## in which (R).sub.n is hydrogen or up to three identical or different substituents selected from halogen, CF.sub.3, NO.sub.2, CN, alkyl, alkoxy and alkylthio, and A is oxygen, sulfur or N(C.sub.1 -C.sub.4)alkyl, provided that the --OH group is not in para-position if (R).sub.n is hydrogen and A is sulfur, are useful as starting materials for the manufacture of selective herbicides.
Abstract:
A process for the manufacture of 2,6-dichlorobenzoxazole and 2,6-dichlorobenzthiazole by chlorinating K.sup.+ or Na.sup.+ salts of 6-chloro-2-mercaptobenzoxazole or of 6-chloro-2-mercaptobenzthiazole in halogenated hydrocarbons as suspending agents.
Abstract:
Phenoxyphenoxy-propionic acid derivatives of the formula ##STR1## exhibit an outstanding herbicidal activity against a wide variety of weed grasses and are well tolerated by dicotyledonous crop plants and various cereals.