酸性反应

The results show that the formation of dry gas is abided by reaction mechanism involving the cleavage of pentacoordinated Carbonium ion which is formed by the protonation of alkanes over acidic catalyst.

结果表明，烷烃分子首先在催化剂酸性中心作用下发生质子化反应，烷烃分子链上易受到氢质子进攻的位置一般在其叔碳原子或碳链中心碳原子附近的C—H键或C—C键处，形成两种反应过渡态物种——五配位正碳离子H-Carbonium和C-Carbonium。

The influence of the resonance effect,the conjugative effect,and the inductive effect on the absorption frequency of the characteristic chemical bonds have been discussed mainly in this paper.

重点讨论了共轭效应、共振效应、诱导效应对功能团吸收频率的影响，并利用吸收频率数据比较有机物的某些性质，如羰基化合物的亲核取代反应，若香烃的亲电取代反应，某些酸的酸性强弱，有机物的异构现象。

The effect of cyclopentene concentration palladium salts, FePc, acid and reaction mechanism were discussed.

在乙腈的酸性水溶液中，考察了 Pd Ac2 /Fe Pc催化氧化环戊烯合成环戊酮的催化活性，讨论了影响该反应活性的因素及其反应机理。

Experimental results indicate that the reduction of chemical oxygen demand were 40%, 38%, 12%, 50%, and 73% for β-naphtho1, salt R, dihydroxy salt R, acid red, and wastewater, respectively when the reactions had run for 4 h at a pH of 1.7. In comparison, the COD reduction of-naphtho1 and salt R were 10.2% and 16.2%, lower than 23.4% and 18.1% with H2O2, while the Fenton reaction time was 1 h.

当pH=1.7、反应4h时，β-萘酚、R盐、二羟基R盐、酸性红、实际废水的化学需氧量去除率分别可达40%、38%、12%、50%和73%；对比实验显示，反应时间为1h时，β-萘酚和R盐的COD去除率分别为10.2%和16.2%，而用H2O2则分别为23.4%和18.1%。

In this work , 1,8-octodiol, the starting material, reacted with 40% hydrobromic acid to produce 8-bromooctan-1-ol, with the catalytic action of PPTs, its hydroxyl group was protected by 2,3-dihydropyran. Then it coupled with 1-heptaalkyne, by means of P-2 nickel as catalyst, stereoselectivity catalysis hydrogenated, with the catalytic action of acid to take off extremital 2, 3-dihydropyran which protected hydroxy group, then used PCC to oxidize alcohol into corresponding aldehyde.

以1，8-辛二醇为原料，与40%氢溴酸进行单溴代反应，得到8-溴-1-辛醇，在对甲苯磺酸吡啶盐的催化下与2，3-二氢吡喃反应，保护分子中的羟基，再与1-庚炔进行偶联，以P-2镍为催化剂立体选择性催化加氢，酸性条件下脱末端的2，3-二氢吡喃对羟基的保护，使用氯铬酸吡啶盐将醇氧化成醛。

The synthesis of eight compounds ( borneol ester and isoborneol ester) and other esters catalyzed by nanometer solid superacids were also researched. In addition, we still analyzed the distinction of esterification yield of borneol ester and isoborneol ester. The particle size, surface area, changes of profile and acidity of nanometer solid superacids were mensurated and analyzed by TEM, BET, XRD, IR and acid indicator.

对纳米固体超强酸催化合成系列正、异冰片酯及其它酯的反应作了一定的研究，论文分析了正、异冰片酯化反应的差异，并用TEM、BET、XRD、IR及酸标指示剂等方法和手段对纳米固体超强酸的粒度、比表而积、形貌变化及其酸性大小进行了分析和测定，通过IR、~1H NMR、~？

Beckmann rearrangement reaction is that amide is formed by ketoxime under the condition of acid catalyzer.

酮肟在酸性催化剂作用下，生成酰胺的反应称为&贝克曼重排反应&。

The alkaline methanolysis of 2 occurred in MeONa-MeOH solution, and gave the products with the inversion of configuration with PhO as a leaving group.

我们曾研究过个别硫代磷酞胺醋的酸性醇解反应'了，关于这类化合物的碱性醇解反应未见文献报道。

At present,the H_2S removal by oxidation of acidic molysite solution is more advanced technology in the world.

酸性铁盐溶液氧化脱H2S是目前世界上比较先进的技术，其具有反应速度快、副反应少、硫磺回收率高和回收剂价格便宜等优点，是目前很有发展前途的H2S脱除方法。

Linear dimerization of isoprene to form myrcene ;2. Synthesis of Unsaturated Cyclothioethers byCycloaddition Reactions of Myrcene;3. The traditional synthesis is by the way of Diels-Alder reaction of myrcene with acrolein over Lewis acid catalysts in organic solvent.

二烷基咪唑或烷基吡啶卤化物与ZnCl2 构成一类新型的具有Lewis酸性的离子液体，以其为催化剂和反应介质，通过月桂烯与丙烯醛的Diels Alder反应高区域选择性地合成了对位柑菁醛。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。