杂原子

In this article, weh ave utilized the ABEEM-σπ model to research this kind of reactions. Through regional softness values of both the atoms and π bonds, which are calculated by this model, we have interpreted properly the typical and particular stereoselectivity of Diels-Alder reaction. Furthermore, we also have initiatorily probed into the rationality and feasibility in terms of synthesizing heteroatomic -ring compounds using Diels-Alder reaction.

本文利用ABEEM-σπ模型对此类反应进行了研究，通过计算原子和π键区域的电荷分布和局域软度，结合局域硬软酸碱原理对Diels-Alder 反应的立体选择性给出了合理解释，而且还初步探讨了利用Diels-Alder 反应合成杂环化合物方法的合理性和可行性。

Some products included methoxy group, naphthyl and heterocyclic aromatic moieties, and some were borne with two 1-propynyl groups. It is more important that compounds bearing halogens were also synthesized via this protocol.

运用此法不仅合成出一些含有醚键、萘环、杂环以及含有两个1-丙炔基的化合物，重要的是芳环上含有卤原子的化合物也能顺利地合成出来。

The electronic structures and local magnetic properties of the nonequilibrium crystalline Fe-Cu and Fe-Ag alloys have been studied.

研究Fe〓P化合物的电子结构发现，由于Fe〓与它周围的P原子有较强的杂化作用，它的磁矩要较Fe〓的小，与Mossbauer谱测量和中子散射的结果一致。

Other types of titanate are chelate (for greater stability in wet environments), quat (water-soluble systems), coordinate and cycloheteroatom.

其它类型的钛酸酯是螯合型、水溶型、配位型和杂环原子型。

The facts indicate that apart from the asymmetric induction of chiral diamine backbone,sterically hindered substitute groups on the aromatic rings,and the presence of sp~3-hydridized amino donors and its N,N\'-disubstituted groups in chiral SalanCrX complexes all play important roles in controlling polymer stereochemistry and enantioselectivity.

研究发现除了手性二胺骨架的不对称诱导作用，苯环上的大位阻取代基、N，N\'-二取代基的位阻作用以及N原子上sp~3杂化的供电子效应都对调控聚合物的区域和对映体选择性有很大作用。

More importantly, tetrazole compounds are a group of energetic materials.

四唑化合物是含四个氮原子的五元杂环化合物。

Diamines are performed. An new and effective atom economy, domino reaction is developed, and 5, 6dihydro-4H-thieno [2, 3-b] thiopyran are synthesized by 4-(4-methyl-1, 3-dithiol-2-ylidene)-1, 7-diaryl-1, 6-diene-3, 5-dione

然后以4-[（4-甲基-1，3-二噻烷-2-亚甲基）-1，7-二芳基]-1，6-二烯-3，5-二酮类化合物为合成子探索稠杂环合成方法，并发现一个高效的，具有原子经济性的多米诺效应合成方法，并成功的利用其合成了一系列噻喃并噻吩衍生物。

Carbyne is one of carbon's allotropes. All carbon atoms were linked in the structure of liner conjugation by sp hybridization.

碳炔是碳的一种同素异形体，分子中所有的碳原子均以SP杂化成键组成一维共轭长链结构。

The pKa values of the amide nitrogen atom are calculated at various hybridization states in amides.

在酰胺中，计算了不同杂化状态时，酰胺氮原子的不同pKa值。

In this research, large volume stainless pots, high－quality pottery pots and enamel pots, instead of traditional small volume pottery pots, were used in storing several kinds of fresh liquor like "Shuanggou Liquor" etc.and the analysis of stored liquor by gas chromatography and atomic absorption spectrum indicated that the application of large volume stainless containers, instead of the traditional pottery pots, could not only advance liquor aging , produce flavour and remove precipitate, develop soft liquor style, stabilize and improve liquor quality,harmonize the balance of components , decrease liquor loss and liquor storage space,but also promote oxidation , reduction, esterification and molecular hydrogen bond association in the process of liquor storage.

对&双沟酒&等各香型酒，利用大容器的不锈钢罐、优质陶缸和搪瓷罐代替传统小容积陶坛或陶缸贮存新酒作了试验研究。采用气相色谱和原子吸收光谱对贮酒分析，得出采用不锈钢等大容器代替传统小陶罐贮存酒，不但可使酒在贮存过程中进行氧化、还原、酯化和分子氢键缔合作用，促进酒体老熟去杂增香，使酒体柔和老熟、成分平衡协调，稳定和提高酒质；而且还可以降低酒的损耗和减少贮酒库占地面积。孙悟

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。