Sankyo Company, Limited

Tadashi Murakami

Kazuo Tomita

Hideakira Tsuji

Keigo Matsumoto

Katsuhiro Fujita

Toyokuni Honma

Yoshio Yamazaki

Shinji Yokoi

Compounds of formula (I): ##STR1## (wherein: R.sup.1 represents a hydrogen atom or a halogen atom;

Carbamoyloxy-isoxazole derivatives, their preparation and insecticidal

3-hydroxy-5-methylisoxazole is prepared by reacting diketene in a continuous process with hydroxylamine to give a reaction mixture containing acetoacetohydroxamic acid and then acidifying this reaction mixture as quickly as possible to produce the 3-hydroxy-5-methylisoxazole.

Process for preparing 3-hydroxy-5-methylisoxazole

Compounds of formula (I): ##STR1## (wherein R.sup.1 represents a hydrogen or halogen atom R.sup.2 represents an alkyl, alkenyl, alkynyl, optionally substituted aralkyl or optionally substituted aryl group and A represents a sulphur atom or a sulphinyl or sulphonyl group) have insecticidal and acaricidal activity and, when formulated in suitable compositions for agricultural or horticultural use, can be used to protect plants from attack by insects or acarids.

Isoxazolinone derivatives, process for their preparation and

Mono- and di-thiophosphate esters having an isoxazolinone system attached at its 2-position through an optionally alkyl- or phenyl-substituted methylene or ethylene group to the sulphur or to one of the sulphur atoms are useful as insecticides and/or acaricides.

Mono- and di-thiophosphate esters containing an isoxazolinone ring and

Isoxazolone derivatives having the formula ##STR1## wherein X is hydrogen atom, a lower alkyl group or a halogen atom; Y is hydrogen atom, a lower alkyl group or phenyl group; and R.sub.1 and R.sub.2 may be the same or different and each represents a lower alkyl group, a cycloalkyl group, an alkenyl group, an alkoxycarbonylalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, a lower alkoxy group, a phenyl group which may be substituted with one to three substituents or an aralkyl group which may be substituted with one to three substituents in the aryl moiety. They are useful as plant growth regulators, more specifically herbicides and plant growth retardants, and prepared by reacting the corresponding N-halogenocarbonylisoxazolone with an amine or by reacting the corresponding 3-hydroxyisoxazole with a carbamoyl halide.

Isoxazolone derivatives, their preparation and their use as plant growth

Isoxazolone derivatives having the formula ##STR1## wherein X is hydrogen atom, a lower alkyl group or a halogen atom; Y is hydrogen atom, a lower alkyl group or phenyl group; and R.sub.1 and R.sub.2 may be the same or different and each represents a lower alkyl group, a cycloalkyl group, an alkeyl group, an alkoxycarbonylalkyl group, a cycloalkyl group, an alkenyl group, an alkynyl group, a lower alkoxy group, a phenyl group which may be substituted with one to three substituents or an aralkyl group which may be substituted with one to three substituents in the aryl moiety. They are useful as plant growth regulators, more specifically herbicides and plant growth retardants, and prepared by reacting the corresponding N-halogenocarbonylisoxazolone with an amine or by reacting the corresponding 3-hydroxyisoxazole with a carbamoyl halide.

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Hiromachi, Japan

Tadashi Murakami