烯酮

Side-stream experiment for the removal of sec-butanol from recycle butylenes by adsorption on adsorbent PUMS-01 was carried out in a methyl ethyl ketone unit.

对甲乙酮装置循环丁烯脱除仲丁醇吸附剂PUMS-01进行了工业放大实验，实验结果表明产品性能达到了小试实验的水平。

Employing CuI(5 mol%), N,N-dimethylglycine hydrochloride(10 mol%) and K_2CO_3(2 equiv.) in refluxing THF as the optimized reaction conditions,the four-membered 4-alkylidene-2-azatidinones could be efficiently synthesized.

当以3-溴-3-N-苯基-丁烯酰胺为底物，在5 mol%CuI为催化剂，10 mol%N，N-二甲基甘氨酸盐酸盐为配体，2当量K_2CO_3作碱，THF回流的反应条件下，可以高效的合成2-亚甲基-4-氮杂环丁酮类化合物。

According to the result of asymmetric Diels-Alder reaction of phenyl-sulfonyl a , P-unsaturated ketones and cyclopentadiene catalyzed by chiral Titanium catalysts and the structure of crystal, we discussed the mechanism of asymmetric Diels-Alder reaction.

根据苯磺酞基取代的a，p一不饱和酮与环戊二烯在钦手性金属催化剂存在下的不对称Diels一Alder反应的结果以及我们测得的单晶结构，初步探讨了不对称催化Die1S一Alder反应的机理。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。