摘要
1 前言纹枯病为水稻三大病害之首,目前主要采用药剂来防治。禾穗安(暂定名)是日本特殊农药公司80年代报道的纹枯病防治新药,化学名称为:N对氯基N仲丁基N′苯基脲[1～4]。该药纯品为白色晶体,熔点80～81℃[2]。据资料报道,其防治水稻纹枯病的效果与戊菌隆(pencycuron)处...
Cheap petroleum ether was successfully used as the solvent instead of expensive n hxane in synthesizing N (p chlorobenzyl) N (sec butyl) N′ phenylurea from 4 chloro N (sec bytyl)benzylamine and phenyl isocyanate.Proper synthetic condition is as follows:molar ratio of phenyl isocyanate to 4 chloro N (sec bytyl)benzylamine being 1.02∶1.00,reaction temperature,45℃;reaction time,3.0h;the quantity of petroleum ether,2.67L/mol(4 chloro N (sec bytyl)benzylamine).The purity of the product is 95.0% or more,and the yield is 92.4%(based on 4 chloro N (sec butyl)benzylamine).
出处
《化学研究与应用》
CAS
CSCD
1999年第4期396-398,共3页
Chemical Research and Application
