查询词典 dipolar

We developed a new method for the synthesis of cycl[3,2,2]azines.Using oxidant promoted 1,3-dipolar cycloaddition reaction, 3,5-dicarbonyl-indolizines were prepared. By treating with low-valenttitanium, cycl[3,2,2]azines were obtained in high yields.

我们通过l，3—偶极加成反应合成了多种3，5-二羰基中氮茚，然后在低价钛试剂作用下还原偶联，以较高收率得到各种取代Cycl[3，2，2]azine，开发了一种全新的Cycl[3，2，2]azine合成法。

In the first part, rhodium acetate catalyzed 1, 3-dipolar reactions of 1-diazo-2-oxo-propylphosphonates with nitriles was studied.

在催化量的醋酸铑作用下，1-重氮-2-羰基丙基膦酸酯与芳香腈顺利进行反应，而对脂肪腈的反应则很复杂，没有得到预期产物。

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。