烯

The photochemical graft copolymerization of isoprene on the surface of tetrafluoroethylene-propylene copolymer was effected by external magnetic field.

我们已经报道了异戊二烯在四氟乙烯一丙烯共聚物的光化学接枝反应，并且证实了该反应是按三重态机理进行的〔l。

Typically around a quarter of each tyre is made from isoprene derived from petrochemicals, and about 60% of worldwide isoprene production is used by tyremakers.

通常一个轮胎中所含的来自石油化工产品的异戊二烯约为25%，全世界近60%的异戊二烯产品都供给轮胎制造商。

The exceptional purity of the n-heptane distilled from Jeffrey Pine resin, unmixed with other isomers of heptane , led to its being used as the defining zero point on the octane rating scale of petrol quality.

还含有溶解在萜烯中的不挥发的黏性固体，所以当树脂暴露在空气中，萜烯类物质挥发掉，使得树脂黏度增大，形成固体。

Therefore, studies on the synthesis and the applications ofα-alkenoyl ketene dithioacetals should be a valuable research project.

因此，α-烯酰基二硫缩烯酮的合成及其在合成中的应用研究是一重要的研究课题。

Based on our early work, we will discuss the coupling the Nazarov cyclization-halogenation reaction ofα-alkenoyl ketene dithioacetals under Vilsmeier conditions.

基于以上的研究，本文着重讨论了(来源：ABacC论文cece网www.abclunwen.com)α-烯酰基二硫缩烯酮在Vilsmeier试剂作用下的Nazarov环合反应。

Ketenes, notably dimethyl ketene, readily undergo oligomerization and polymerization

烯酮，特别是二甲基烯酮，很容易齐聚和聚合。

No reactions were observed for reactions of benzodiazepines with ketene atroom temperature; but the reaction of benzothiazepines with monochloroketene gave[2+2] cycloadducts .

发现在室温下苯甲酰基苯并二氮杂卓与烯酮没有反应，而苯并硫氮杂卓与一氯烯酮形成了正常的β-内酰胺环产物。

A novel zwitterion derived from the addition of thiazole carbene to ketene was discovered and captured by an activated alkyne. In this process, we developed a facile and efficient three-component tandem reaction involving thiazole or benzothiazole carbene, disubstituted ketene and activated alkyne.

我们发现了一种新的噻唑卡宾和烯酮形成的两性离子的存在，并用活泼炔成功捕捉，从而发展了一个新的噻唑卡宾或苯并噻唑卡宾、二取代烯酮和活泼炔的三组分串联反应。

The smaller fullerenes C2n (2n 60) violating IPR, inevitable suffer large strain energies and show high lability. Besides that, quasi-fullerenes violating the classical definition, contain rings of other size, for example 4 or 7, are expected to suffer extra local strain or/and further loss ofπdelocalization, and thus highly unstable.

碳原子数少于60的小富勒烯，和结构中含有除五元环、六元环之外的其他结构的准富勒烯，由于不满足IPR规则，结构中必然存在较大的张力，因此具有较高的化学活性，难以在实验中合成和分离。

The results of sensory evaluation and GC/MS showed: adding oxidated leaf fat could improve the lipid flavor but could not improve the characteristic flavor,adding oxidated lean fat could improve both the lipid flavor and characteristic flavor.

感官评定和气质联用的结果表明：添加氧化后的鸡板油增加了反应体系的脂香，但不能提高反应产物的特征香味；添加氧化后的肌肉脂肪后，由于生成了壬醛、2-十一烯醛、E，E-2，4-癸二烯醛，使得反应体系的特征香味增强。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。