查询词典 decarboxylation

As observed in the Pleistocene, thick intervals of negative δ13C values occur in the Neoproterozoic but are considered to record profound perturbations to the global marine carbon cycle unique to the Neoproterozoic rather than being considered in terms of normal mixed meteoric/marine lithification or decarboxylation.

更新世的观察表明，新元古代存在着一个较长时期的δ13C负值，这些负值记录了全球海洋碳同位素的波动循环是新元古代独有的，而并非通常意义下的大气海洋水混合产生的岩化作用和脱羧基作用。

The major route of β-alanine production for pantothenate in Escherichia coli is through the α-decarboxylation of L-aspartate, which is catalysed by the enzyme L-aspartate-α-decarboxylase. The panD mutant of E. coli is β-alanine auxotrophy.

在大肠杆菌中，用于泛酸生物合成的的β-丙氨酸主要是由L-天冬氨酸α位脱羧而产生，这个生化反应由panD基因编码的L-天冬氨酸-α-脱羧酶催化。

Pentoses are synthesized in the Calvin cycle, derived from hexoses in the PENTOSE PHOSPHATE PATHWAY,and also made by decarboxylation of nucleoside diphosphate sugars.

戊糖在卡尔文循环中合成，来源于磷酸戊糖途径中的己糖，也由核苷二磷酸的糖脱羧形成。

A colorless,foul - smelling ptomaine,NH2(CH2)4NH2,produced in decaying animal tissue by the decarboxylation of ornithine.

腐胺一种无色，恶臭的尸碱，NH2(CH2)4NH2，产生于腐烂的动物躯体中的鸟氨酸的脱羧作用

Production technology of synthesis of allantoin are reviewed, including glyoxal oxidation, electrochemical synthesis, calcium glyoxylate synthesis, dichloroacetic acid synthesis, acetochloral method, and oxidative decarboxylation.

评述了乙二醛氧化法、电化学法、乙醛酸钙法、尿素三氯乙醛合成法、尿酸二氯乙酸法和尿酸氧化脱羧法等合成尿囊素的各种工艺。

The target compounds were obtained in high yield through Michael conjugative addition of amines to methyl acrylates, cyclocondensation of the obtained diadducts in the presence of sodium methoxide,and decarboxylation of the cyclocondensation products in acid.

以胺类化合物为原料，与丙烯酸甲酯经过两次Michael加成得到N，N 二丙酸甲酯类化合物，该化合物在甲醇钠存在下进行环合，在酸性条件下脱羧，高收率得到4 哌啶酮类化合物，从而证明了这是一条合成N 取代 4 哌啶酮类化合物的普遍方法。

Firstly, 3-ethylthiobutanal was prepared from crotonaldehyde reacting with ethanehiol in triethylamine with high yield. Secondly, methyl acetoacetate was converted to 6-ethylthiohept-3-en-2-one by three steps via hydrolysis, condensation with 3-ethyltio-butanal and dehydration, then 6-ethylthiohept-3-en-2-one was cycloco ndensed with dimethyl malonate by Michael addition and Claisen condensation, followed by saponification and decarboxylation to give the intermediate of 5-(2-ethylthiopropyl)-cyclohexane-1,3-dione.

首先，以巴豆醛与乙硫醇为原料，在三乙胺的催化作用下高收率制得3-乙硫基丁醛；然后从乙酰乙酸甲酯出发，通过碱水解、与3-乙硫基丁醛缩合、脱水三步反应合成6-乙硫基-3-烯-2-庚酮，接着6-乙硫基-3-烯-2-庚酮与丙二酸二甲酯通过Michael加成和Claisen缩合成环，再通过皂化和脱羧反应生成中间体5-[2-丙基]-1，3-环己二酮；再与丙酸酐反应丙酰化，最后与0-3-氯-2-丙烯基羟胺肟化，得到目标化合物烯草酮。

It could be synthesized by a key intermediate 2-pentylidene cyclopentanone formed a condensation starting from cyclopentanone and n-valeraldehyde, followed by isomerization, Michael addition and a selective decarboxylation.

本文研究了以正戊醛和环戊酮为基本原料，经缩合反应、异构化反应、Michael加成反应和脱羧反应等制备二氢茉莉酮酸甲酯的化学合成方法和工艺。

Production technology of synthesis of allantoin are reviewed, including glyoxal oxidation, electrochemical synthesis, calcium glyoxylate synthesis, dichloroacetic acid synthesis, ace-tochloral method, and oxidative decarboxylation.

评述了乙二醛氧化法、化学法、醛酸钙法、素三氯乙醛合成法、酸二氯乙酸法和尿酸氧化脱羧法等合成尿囊素的各种工艺。

Tert-Butyldimethylsilyloxy) glutaric anhydride, as an important drug intermediate, is synthesized from citric acid by decarboxylation, reduction, hydroxyl protection, esterolysis, cyclization, with the total yield of 30.3%.

介绍了以柠檬酸为起始原料合成3-戊二酸酐的方法。该路线经脱羧反应、加氢还原、羟基保护、酯水解和再闭环，以总收率为30.3%得到目的产物。

Do you know, i need you to come back

你知道吗，我需要你回来

Yang yinshu、Wang xiangsheng、Li decang,The first discovery of haemaphysalis conicinna.

1〕 杨银书，王祥生，李德昌。安徽省首次发现嗜群血蜱。