查询词典 allene

Allene Alum is sold in many stores.

它常常与塔塔粉混合。

Allene is an isomer of methyl acetylene.

丙二烯是甲基乙炔的一种异构体。

In all cases, only the biboronic products with one boryl group adding to the middle carbon and the other to the nonsubstituted terminal carbon of the allene moiety were observed.

两个硼酯基都接於丙二烯基没有取代的末端双键上。立体选择性很高，主要的产物都是Z form的形式。

The iron sulfide cleaning formulation with the surfactant, allene diamine, citric acid and EDTA as the main ingredients could react rapidly with the iron sulfide to form ethylene and element sulfur in the presence of catalyst.

一种以表面活性剂、丙二烯二胺和柠檬酸、EDTA为主要组分的硫化亚铁清洗配方，在催化剂存在的条件下能迅速与硫化亚铁发生反应，生成乙烯和单质硫。

In this thesis, we investigate the possible reaction product distribution and mechanism of the carbon monophosphide CP radical with unsaturated hydrocarbons allene CH_2CCH_2 and methylacetylene CH_3CCH at the B3LYP/6-311+G, QCISD/6-311++G(2df,2p), and G2 levels of theory.

中文摘要：本文在B3LYP／6-311+G和QCISD／6-311++G(2df，2p)及G2水平下研究了CP自由基与CH_2CCH_2以及与CH_3CCH两反应体系的产物分布和反应机理。

In this thesis, we investigate the possible reaction product distribution and mechanism of the carbon monophosphide CP radical with unsaturated hydrocarbons allene CH_2CCH_2 and methylacetylene CH_3CCH at the B3LYP/6-311+G, QCISD/6-311++G(2df,2p), and G2 levels of theory.

本文在B3LYP／6-311+G和QCISD／6-311++G(2df，2p)及G2水平下研究了CP自由基与CH_2CCH_2以及与CH_3CCH两反应体系的产物分布和反应机理。

Halohydroxylation reaction of allenyl sulfides occurs predominately with the β,γcarbon-carbon double bonds with the halogen atom bonded to the middle carbon atom of the allene moiety.

在1，2-联烯基硫醚分子中由于同时存在着硫原子和具有两个相互垂直π-键的累积双烯结构，使其具有一些特殊的反应性能。

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。

Similar to S-adenosylmethionine decarboxylase(B26),S-adenosylmethionine methyl-transferase(B70), allene oxide synthase(B38),ethylene receptor(B96),cytochrome P450(B58) and methionine synthase (B77) were found in ovaries of Pingyi Tiancha at 1d before the blossom day,which related to plant hormone and could participate in metabolic pathways of ethylene,polyamine,jasmonate acid and gibberellin,et al.,as well as had close relationship with maturity and senescence of plants.

在平邑甜茶开花前1d的子房中发现的S-腺苷甲硫氨酸脱羧酶(B26)、S-腺苷甲硫氨酸甲基转移酶(B70)、丙二烯氧化合酶(B38)、乙烯受体(B96)、细胞色素P450酶(B58)、甲硫氨酸合酶(B77)等相似基因片段与植物体内的生长素有关，将会参与乙烯、多胺、茉莉酸、赤霉素等的代谢途径，与植物的成熟和衰老具有密切的关系。

During the investigation of the reactivity of O_SCl_2(PPh_3)_2CH=C(PPh_3CHCH=CH_2 and O_SCl_2(PPh_3)_2CH=C(PPh_3C(=CH_2)CH=CH2, several stable osmacycles with novel structure, such as osmabenzenes, osmafurans, osmacycles containing intramolecular-coordinated allene, intramolecular-coordination osmacycles containing osmacarbene, an osmacyclopentadiene, were isolated during the investigation of the reactivity of O_SCl_2(PPh_3)_2CH=C(PPh_3CHCH=CH_2 and O_SCl_2(PPh_3)_2-CH=C(PPh_3C(=CH_2)CH=CH_2.In addition, some convenient and efficient methods to prepare these osmacycles were developed.

首先，合成出两种具有反应活性的金属杂五元环IC配合物OsCl_2(PPh_3)_2CH=C(PPh_3CHCH=CH_2和OsCl_2(PPh_3)_2CH=C(PPh_3C(=CH_2)-CH=CH_2，并对它们进行了系统表征；进而，研究了这些活性五元配合物的反应性，合成出多种稳定的锇杂环配合物，其中包括锇苯、锇呋喃、含配位联烯的锇杂IC环化合化物、含锇卡宾的IC环化物、首例锇杂环戊二烯化合物等多元化的产物。

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。