preferential elimination system of counting accordingly, in the case of multiple choice questions, the student should be aware of the following.
按选择次序淘汰点票制所以参加多项选择题测验时,学生必须注意下列几点。
A preferential 1,2 elimination reaction of syn diethyl ( 2-acetylamino-1-bromo-2-( p-methoxy-phenyl) ethyl) phosphonate 1 rather than the anticipated nucleophilic substitution reaction under basic conditions is described in the present paper.
报道了在碱性条件下,顺(2-乙酰胺基-1-溴-2-(对-甲氧基苯基)乙基)膦酸二乙酯进行的是-1,2-消除反应而不是所期望的亲核取代反应。
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