查询词典 j

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］。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。