...主目录 返回 2008-1-21α和β 位氢有弱酸性 R C W R C- W H B H 有弱酸性 B- (碱) W: 吸电子基(electron withdrawing group) ( ) 在卤代烷中 δδ δ R C C X C C X- HNu β α β R α H H H Nu- 消除βH成烯烃 成 β α和β位氢均有弱酸性 消除反应El...
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其中EWG为吸电子基团(electron withdrawing group); X=Br,I;Rl为脂肪族,芳香族有机/生物基团 由于巯基中硫原子的d轨道的组合以及电子密度,它的亲核性介于羟基和氨 基之间,...
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The electron withdrawing group (F) being introduced into the alkyl groups of then-hexyl ZDDP is able to strengthen chemical adsorption between ZDDP and Fe atoms.
在伯烷基上吸电子基团能增强硫原子与铁原子之间的化学吸附作用力。
Moreover, We found that the relaxation time of H2TPP with donating electron group is about 7 times faster than that with withdrawing electron group.
另外,还发现推电子基团取代的卟啉弛豫过程比吸电子基团取代的卟啉弛豫过程快7倍。
The dinitrobenzene with electron-withdrawing group can be hydrogenated much easier than the dinitrobenzene with electron-donating group.
含有吸电子基团的二硝基苯类化合物反应活性明显高于含有供电子基的二硝基化合物的加氢反应;
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