互变异构

Our results also indicate that the electron-withdrawing character of R2 and R1 also influences the activation energy of the tautomerization reaction.

结果表明，温度对四唑互变异构反应影响很大，低温下四唑在气相中主要以2H-式存在，随着温度的升高1H-式含量增大。

For these compounds, it is necessary to polymerize the intermediate species before tautomerization, eg, at low temperature, eg,-1000C to 1000C, and preferably -100C to 250C, and under anhydrous conditions, to produce vinyl amine polymers.

对于这些化合物，这是必要的聚合中间物种之前，互变异构，例如，在低温下，如- 1000c ，以1000c ，最好是- 100c ，以250c ，并根据无水条件下，生产乙烯胺聚合物。

Hydration of Alkynes, Tautomerization.

炔烃的水化作用，互变异构化。

Gibbs free energy of the hydrogenating reaction of acetylacetone iron to produce pure iron and acetylacetone was investigated according to the frequency analysis results.

根据频率分析结果，计算不同温度下乙酰丙酮铁加氢生成铁和乙酰丙酮两种互变异构体的吉布斯自由能。

The present invention relates to compounds of formula wherein R is hydrogen, lower alkyl, lower alkoxy, halogen or lower alkyl substituted by halogen; R is hydrogen or halogen; or R and R are together with the carbon atom to which they are attached -CH=CH-CH=CH-; R is hydrogen, lower alkyl, phenyl optionally substituted by halogen, or is hetaryl, optionally substituted by lower alkyl; R is hydrogen, lower alkyl, phenyl, benzyl, lower alkenyl, lower alkoxy, phenyloxy, benzyloxy, S-lower alkyl, halogen, CN, lower alkyl substituted by halogen or O-lower alkyl substituted by halogen; R is hydrogen or lower alkyl, aryl is phenyl or naphthyl; n is 1, 2 or 3; m is 1 or 2; and pharmaceutically acceptable acid addition salts and tautomeric forms thereof.

本发明涉及式化合物及其可药用的酸加成盐和互变异构形式，其中R 1 是氢、低级烷基、低级烷氧基、卤素或被卤素取代的低级烷基；R是氢或卤素；或R 1 和R与它们连接的碳原子一起是-CH＝CH-CH＝CH-；R 2 是氢、低级烷基、任选被卤素取代的苯基或者是任选被低级烷基取代的杂芳基；R 3 是氢、低级烷基、苯基、苄基、低级链烯基、低级烷氧基、苯氧基、苄氧基、S-低级烷基、卤素、CN、被卤素取代的低级烷基或被卤素取代的O-低级烷基；R 4 是氢或低级烷基，芳基是苯基或萘基；n是1、2或3；m是1或2。

Starting with two reactive methylene compounds, ethyl cyanoacetate and malononitrile, two 5-amino-1H-pyrazoles were prepared through the intermediates ketene dithioacetal.

从两个活泼亚甲基化合物开始，经过乙烯酮二硫代缩醛中间体，合成了两个5-氨基-1H-吡唑，以这个两个化合物为中间体，与芳香族和脂肪族α-溴代酮反应，而后经酸催化亚胺化互变异构后得到含咪唑并[1，2-b]吡唑甲硫醚类化合物6a-6g。

The effect of tautomeric isomeride on magnetic interaction was discussed by molecular mechanics and CNDO/2 methods.

本文兼用分子力学和量子化学计算讨论了互变异构体对磁交换作用的的影响。

The above view of isomerization between the structure of olefine alcohol and olefine ketone can succeed to explain that the structure and properties of C〓 Fullerols change with the pH value of its solution.

作者提出的上述富勒醇的结构以及烯醇与烯酮的互变异构的观点能成功地解释C〓、C〓富勒醇的结构随其溶液pH值的变化而发生变化的现象。

Presumably these are caused by the existence of tautomeric forms.

这可能是由于这些化合物存在互变异构体所致。

A major class of tautomeric reactions involves exchange of a hydrogen atom between two other atoms in the same molecule, in both cases forming a covalent bond.

一类主要的互变异构反应是氢原子在两个其它原子间交换，与任何一方都生成共价键。

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！