Nissan Chemical Industries Limited

Gozyo Sakata

Kenzi Makino

Takasi Ikai

Tosihiko Oguti

Yasuo Kawamura

Yasukazu Ura

Yuzi Kawamura

Takeshi Mita

Koichi Maeda

Takuya Kakuta

Tatsuo Numata

Shigeaki Akiyama

Hideki Takamatsu

Kazuya Kusano

Kenzow Fukuda

Quinoxaline derivatives having the formula I

Quinoxaline derivatives and herbicidal composition

Quinoxaline derivatives having the formula I ##STR1## wherein X represents a halogen atom; R represents ##STR2## --CH.dbd.CH--COOR.sup.2 (R.sup.2 represents a C.sub.1 -C.sub.4 alkyl group); --CN or --CH.sub.2 OH, and R.sup.1 represents ##STR3## --S--R.sup.3 (R.sup.3 represents a C.sub.1 -C.sub.4 alkyl or alkenyl group or phenyl or chlorophenyl group), --NH--R.sup.4 (R.sup.4 represents a C.sub.1 -C.sub.4 alkoxy carbonylalkyl group, hydroxy alkyl group, phenyl group; C.sub.1 -C.sub.4 alkoxy alkyl group or di C.sub.1 -C.sub.4 alkyl amino group), are remarkably effective as selective herbicides.

An auric compound such as a halogenoauric acid is reacted with a mercaptan of a formula: ##STR1## whereupon the proportion of the mercaptan is from 2.70 to 2.99 mols per mol of the auric compound, to prepare an organic gold compound of a formula: ##STR2## wherein X is a halogen atom, Y and Z are independently a hydrogen atom or a hydrocarbon group having from 1 to 18 carbon atoms, n is a number of from 0.01 to 0.30, m is a number of from 0.7 to 0.99, and the total of n and m is from 0.8 to 1.2. The organic gold compound has a high solubility in organic solvent such as terpineol.

Organic gold compounds and method of preparing the same

A process for preparing a 2-(4-hydroxyphenoxy) alkanoic acid, its ester or alkali metal salt, or an optical isomer thereof, which comprises condensing hydroquinone or an alkali metal salt of hydroquinone with a compound having the formula: ##STR1## wherein X is a p-toluenesulfonyl group, a methanesulfonyl group, a benzylsulfonyl group, a p-chlorobenzenesulfonyl group or a benzenesulfonyl group, R.sup.1 is a hydrogen atom or a lower alkyl group, and R.sup.2 is a hydrogen atom, an alkyl group or an alkali metal cation, or its optical isomer in the presence of a base.

Process for preparing 2-(4-hydroxyphenoxy) alkanoic acid compounds

A herbicidal composition which comprises an adjuvant and an active ingredient of heterocyclic ether type phenoxy fatty acid derivative having the formula ##STR1## wherein A represents --CH-- or --N--; X represents a halogen atom; n is 0, 1 or 2; R.sup.1 represents a hydrogen atom; a lower alkyl group; R.sup.2 represents --OH; --O-alkyl group; --OM group (M is an inorganic or organic salt moiety); ##STR2## --O-lower alkenyl group; --O-benzyl group; --O-lower alkylalkoxy group; --O-phenyl; --O-cyclohexyl, --O-halogenoalkyl, --O-lower alkynyl and --O-cyanoalkyl; R.sup.3 and R.sup.4 respectively represent a hydrogen atom or a lower alkyl group.

Heterocyclic ether type phenoxy fatty acid derivatives and herbicidal

1-Phenylethyl sulfone derivatives substituted by a halogenated alkyloxy group is represented by the general formula ##STR1## where R is an alkyl group substituted by a halogen atom, n is 1 or 2, each of P and Q is a hydrogen atom or a lower alkyl group and each of X and Y is a hydrogen atom, a lower alkyl group or a halogen atom. The compounds are effective as a herbicide. Also disclosed is a process for their preparation.

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Funabashi, Japan

Gozyo Sakata