查询词典 propyne

Furthermore, the mechanism of isomerization between propyne and allene mediated by HCo 〓 has been proposed.

此外，基于反应的自由能曲线，提出了HCo〓催化丙炔和丙二烯异构化反应机理。

HCo 〓-catalyzed hydroformylation and isomerization of allene and propyne Allene hydroformylation favors the linear anti-Markovnikov product in high regioselectivity both kinetically and thermodynamically. The origin of this regioselectivity comes from the enhanced stability of the η〓-allylic intermediate (η〓-CH〓CHCH〓 Co 〓.

HCo〓催化的丙二烯和丙炔氢甲酰化反应及异构化反应 HCo〓催化丙二烯氢甲酰化反应的区域选择性主要由不可逆的丙二烯插入步骤决定，动力学和热力学因素都有利于形成anti-Markovnikov中间物种(η〓-CH〓CHCH〓)Co〓，形成Markovnikov中间物种Co〓是不具有竞争性的。

Theoretic studies on dissociation of propyne at 157 nm were performed.

从头算方法对丙炔在157nm光照下的一个光分解途径C3H4→CH3+C2H进行计算研究。

Theoretic studies on dissociation of propyne at 157 nm were performed.

用从头算方法对丙炔在157nm光照下的一个光分解途径C3H4→CH3+C2H进行计算研究。

In order to discuss the regioselectivity of nitrile oxide 1,3-dipolar cycloaddition to propyne , 1,3-dipolar cycloaddition reaction of substituted nitrile oxide (RCNO, R=F, NO2, OCH3, OH, COOCH3, CHO, CONH2, H, CH3) with propyne was studied using density functional theory at the 6-311++G** level, and the reaction rates were calculated at different temperature from 200 to 400 K.

用密度泛函B3LYP/6-311++G**方法研究了氧化腈(RCNO，R=F，NO2，OCH3，OH，COOCH3，CHO，CONH2，H，CH3)与丙炔的1，3-偶极环加成反应，并且计算了不同温度下的反应速率常数，讨论了氧化腈上不同取代基R的取代效应和温度对反应区域选择性的影响。

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。