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Second, the polymerization behaviors of alkoxyl substituted Cp titanocene for styrene syndiotactic polymerization were investigated.

其次，本文研究了烷氧基取代的茂钛络合物对苯乙烯间规聚合的催化作用。

The geometry structures have been optimized by semiempirical method AMI, on the base of this, the electronic properties and energy band structure of typical polymers were performed by EHMACC. The influence of photo-electricity on PPV-like electroluminescent polymers substituted by alkyloxy and cyano were discussed.

采用半经验AM1方法优化体系的几何结构，在此基础上，对典型的聚合物采用EHMACC程序计算能带结构，讨论烷氧基和氰基取代对PPV类电致发光聚合物光、电性质的影响。

Reduction of 2-bromodifluoromethyl substituted propargyl vinyl ether afforded the difluorovinyl propargyl ether, which rearranged to the corresponding allene bearing a gem-difluoromethene in the mid-aliphatic chain.

第三部分，在碱性条件下，α-氟烷基乙酸乙酯与炔丙醇反应制备了一系列的氟烷基取代的炔丙基烯基醚，并研究了它的Claisen重排反应，得到了2，4-不饱和的氟烷基酮。

METHODS: Based on the antitumor activity and structural feature of 8-chloroadenosine and retinoic acid, modifications were made at positions 5′ and 8,substituted cinnamoyl and benzoyl groups were bound at 8 position through amido and ester bonds, sulfonation and nitrosation at 5′-OH and its direct chlorination were conducted.

对腺苷的8位和8-Cl-腺苷的糖环羟基进行了结构改造，以酰胺键和酯键在腺苷的8位连接了具共轭基团的肉桂酰基和苯甲酰基，得到腺苷的维甲类似物；对8-Cl-腺苷的5′-羟基进行了甲磺酰化，硝基化以及氯代反应，得到了它的衍生物。

2-Substituted-3,4-dihydro-1(2H)-isoquinolinones were synthesized from methyl 3-hydroxy-ben- zoates via allyl etherification, Claisen rearrangement, oxidation, reductive amination and aminolysis for the first time.

以3-羟基-4-甲氧基苯甲酸甲酯等为原料，通过烯丙基醚化、Claisen重排、氧化、与伯胺反应、还原、分子内酯的胺解六步反应合成了一系列2-取代-3，4-二氢-1-异喹啉酮类化合物。

It not only can prepare substituted arylamine sulfoacid with high-quality and high-yield, but also can easily control reaction temp., and reduce reaction temp..

所说的方法不仅能高质量、高产率地制备取代芳胺磺酸，而且由于在有机溶剂中进行反应，可非常容易地控制反应温度，并可降低反应温度。

Making use of this reaction, thirteen methyl 2-arylamino-2-deoxy 3-keto glucopyranosides (5～17) with different substituted arylamino groups and two

选择不同类型的芳胺利用该反应合成了一系列共十三种2-脱氧2-芳胺基3-位氧化α-甲基D-葡萄糖苷（5～17），该类化合物为重要的手性合成子。

In Atbash, the first letter was substituted by the last letter, the second letter by the next to last letter, and so on.

在埃特巴什编码体系中，第一个字母用最后一个字母替换，第二个字母由倒数第二个字母替换，如此等等，依此类推。

The results show that the main metastable phase of glass 20BaO15Ga_(2)O_(3)65GeO_(2 ) is BaGa_(2)Ge_(2)O_(8), but that is BaGe_(2)O_(5) when BaF_(2) is substituted totally for BaO in the glass.

结果表明：摩尔组成为20BaO15Ga2O365GeO2玻璃的主要亚稳相是BaGa2·Ge2O8，而以BaF2替代玻璃中的全部BaO后，玻璃的主要亚稳相转变为BaGe2O5。

Were synthesized by Knoevenagel condensation between substituted-3-formylchromone and barbituric acid or thiobarbituric acid in solid phase without solvent and catalyst.

在无溶剂无催化剂条件下，取代-3-甲酰色酮与巴比妥酸通过固相 Knoevenagel缩合反应合成了一系列5-(取代色酮基-3-亚甲基)巴比妥酸，收率68。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！