The Effects for insecticide and synthesis of 5,6,8-trichloro-2,4-di-trichloro methyl benzo-1,3-dioxane

[摘要] An insecticide was obtained from condensation of chloral hydrate with 2,4,5-trichloro phenol. The structure of the insecticide was found to be 5,6,8-trichloro 2,4-di-trichloro methyl benzo 1,3-dioxane. The best conditions of the condensation were as follows: 1) The sulfuric acid concentration; 97%. 2) The mole ratio of sulfuric acid to 2,4,5-trichloro phenol; 14.2. 3)The mole ratio of chloral hydrate to 2,4,5-trichloro phenol; 2.4. 4) The reaction time & reaction temperature;15hrs & 50-55 ¡É.The insecticidal effects of T. D. B against the Citrus Red Mite and Green Peach Aphid were the same of Mydran.

[学科分类] 化学（综合）