Preparation of alpha-(substituted-phenoxy)alkanecarboxylic acid
专利汇可以提供Preparation of alpha-(substituted-phenoxy)alkanecarboxylic acid专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain the title compound, useful as a selective herbicide which kills Gramineae weeds on the field of broad-leaf crops, in high yield, by thermal hydrolysis of α-(substituted-phenoxy)alkylamlonic acid ester in the presence of an alkaline substance.
CONSTITUTION: A compound of formula I (A is CH or N; X
1 is halogen or CF
3 ; X
2 is H or halogen; R
1 is alkyl; R
2 is alkyl, alkenyl, or alkynyl) is thermally hydrolyzed to give a compound of formula II. The reaction is carried out in the presence of 1.2W2.5 moles, based on 1 mole of the compound of formula I, of an alkaline substance (e.g. NaOH and Na
2 CO
3 ). Alcohols, dioxane, DMF and other aprotic polar solvents can be used as the solvent. The reaction is carried out generally at 30W120°C for 0.5W6hr.
COPYRIGHT: (C)1980,JPO&Japio，下面是Preparation of alpha-(substituted-phenoxy)alkanecarboxylic acid专利的具体信息内容。
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5 液体除草制剂
