Showing papers by "Hirosuke Yoshioka published in 1988"

Pyridazinone derivative, process for producing thereof and insecticide, acaricide and fungicide containing said derivative as active ingredient

Abstract: There are disclosed a pyridazinone derivative represented by the formula: wherein R¹ represents a lower alkyl group; R² re­ presents a halogen atom; R³ represents a hydrogen atom, a halogen atom, a nitro group, a formyl group, a lower alkenyl group, a substituted or unsubstituted alkyl group having 1 to 10 carbon atoms, a lower alkoxy group, a substituted or unsubstituted 1,3-­ dioxolan-2-yl group, a lower alkoxyiminoalkyl group, an acyl group or a 1,3-thiooxolan-2-yl group; n represents an integer of 1 to 5; A represents a straight or branched alkylene group having 2 to 4 carbon atoms: and X and Y each independently repre­ sent an oxygen atom or a sulfur atom. or an acid addition salt thereof, a process for producing the same, and an insecticide, an acaricide and a fungicide containing the derivative as the active ingredient.

Aminopyridazinone derivative, production thereof, insecticide and acaricide containing said derivative and active ingredient

Abstract: NEW MATERIAL:An aminopyridazinone derivative shown by formula I (R1 is lower alkyl or phenyl; R2 is lower alkyl; R3 is H or lower alkyl; R4 is 1-10C alkyl, 3-5C alkenyl, lower alkoxy, 3-5C alkenyloxy, 3-5C alkynyloxy or aralkyloxy group-substituted lower alkyl) and an acid addition salt thereof. EXAMPLE:2-t-Butyl-4-chloro-5-[ 2-(4-pentyl-2-methylphenoxy) ethyl ]-amino-3(2H) pyridazinone. USE:Useful as an active ingredient for insecticides, acaricides and nematocides, having especially excellent insecticidal and acaricidal activities, wide application ranges, uses and high effects. PREPARATION:A compound shown by formula II is reacted with a compound shown by formula III in the presence of a base such as preferably triethylamine, etc., under heating in a solventless state to give a compound shown by formula I.

Novel Synthesis of Monofluorocyclobutanes by the Ring Expansion-Fluorination of Cyclopropylmethanols with an Amine-Metal Fluoride-Pyridinium Poly(hydrogen fluoride)-Complex.

Abstract: Various new 1-fluoro-1-alkyl(or aryl)-2-substituted cyclobutanes were synthesized stereoselectively from 1-alkyl(or aryl)cyclopropyl carbinols by the ring expansion-fluorination using (iPr)2-KHF2-(HF)n·Py, and 2-hydroxymethyl-1-fluorocyclobutanes were synthesized via a new rearrangement of (1-alkyl(or aryl)cyclopropyl) ethylene oxides.