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Second, using DBU as the base for enolization of propargylic esters of unsaturated acids 18e-k, we developed a tandem Ireland-Claisen rearrangement /isomerization reactions. It has been shown that the reaction sequence affords triene molecules 42a-b and 43a-b in moderated to high yields. Interestingly, with allyl hexa-3,5-dienoates 18i-j as the substrate, the rearranged products underwent further aromatization to give uniquely substituted benzyl acids 44a-b.

其次,以含有活泼质子的烯酸炔丙酯18e-k为底物,在DBU为烯醇化碱、TMSCl为硅试剂的条件下,底物18e-h发生了Ireland-Claisen重排/异构化串联反应,得到完全共轭的三烯类化合物42a-b及43a-b;而以己二烯酸炔丙基酯18i-j为底物时,重排/异构化后的产物进一步发生电环化等反应最终得到芳构化产物——取代苯甲酸类化合物44a-b。

Lidar measurement s of cloud and aerosol in t he upper troposphere in beijing[J].

北京地区对流层中上部云和气溶胶的激光雷达探测[J]。

Effect of dietary essential fatty acids and vitamins on egg quality in turbot broodstocks[J].

环境温度对鸡饲粮代谢能测值及血浆中甲状腺激素浓度的影响[J]。

It has been my experience with respect to the first recipient of the Turing Award, Professor Alan J.

在我个人的印象中,图灵奖第一位得主Alan J。

The key points of designing underwater TV camera system[J].

水下电视系统研制中的技术难点及解决方法[J]。

Prediction method of unburnt carbon for coal fired utility boilers using image processing technique of combustion flame[J].

图像处理技术用于发光火焰温度分布测量的研究[J]。

Much that is uncritical may also be found in the annals of the order by J.

许多应该批判,可能也见诸于史册的命令由j。

Doctor Roger·J·Williams an excellent biochemist in twenty century stated in his research report:There are barely two sources for permanent uncured sickness as scarcity of material and accumulation of toxin.

20世纪杰出的生物化学家罗杰。J。威廉姆斯博士在他的研究报告中指出:疾病久治不愈只有两个根源——材料不足,毒素积累。

Unendowed with genius- J.L.Lowes.

没有被赋予天才——j·l·洛斯。

Numerical analysis and research of strength in connecting thread when unguided rocket launching[J].

火箭弹发射时连接螺纹处强度的数值分析和研究[J]。

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推荐网络例句

I didn't watch TV last night, because it .

昨晚我没有看电视,因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来,在北京的很多小区里,电梯液晶电视被撤了下来。

I'm running my simile to an extreme.

我比喻得过头了。