Methyl 2, 6 - dichlorophenoxyacetate is prepared with 2, 6 - dichlorophenol , sodium methoxide and methyl chloroacetate as raw materials.以2, 6- 二氯苯酚 、 甲醇钠甲醇溶液和氯乙酸甲酯为原料,合成了2, 6-二氯苯氧乙酸甲酯.Dimethyl carbonate is synthesized d...
Except for the transitional elements, valency electrons are in the outermost electron shell.除去过渡元素外, 价电子位于最外面的电子层.Transitional metals ( Fe 3 + ) play an extremely important role in catalyzing CLA oxidation.变价金属离子 ( Fe~(3...
The murderer’s entreaties for mercy availed to nothing.无人理会杀人犯的求饶。No words availed to pacify him.说什么也不能使他平静下来.But what availed his expressions or his air?但是神态和表情有什么用 呢 ?The murderer's entreaties for mercy availed to...