查询词典 butanal

The asymmetric transformation of L-Pro via the formation of salt with S-tartaric acid was carried out by butanal as catalyst and butanoic acid as solvent to obtain D-Pro · S-TA salt.

实验研究了L一Pro的消旋反应，并获得刀乙一脯氨酸，然后在消旋的基础上研究L一Pro的不对称转换，最后得到D一Pro。

The metabolites were mainly aldehydes and acids when the level of inoculation was 10~9cfu/ml, however, alcohols, acids and esters were produced when the level of inoculation was 10~8cfu/ml. The optimal temperature and pH for production of 3-methyl butanal were 40℃ and 7.0, but NaCl and NaNO_2 inhibited its production.

接种量不同会导致代谢BCAA的产物不同：接种量为10~9 cfu/ml时生成相应的醛和酸；接种量为10~8 cfu/ml时生成相应的醇、酸和酯。S52菌株在40℃，pH 7.0，无亚硝酸盐和NaCl的情况下产3-甲基丁醛的量最多。

2S, 3S -2-methyl -3-benzoxyl butanal was obtained from cis-2-butene and acetaldehyde in 56. 3％ yield through Brown Crotylation, oxidization, etc.

以顺-2-丁烯、乙醛为原料，经Brown Crotylation反应、氧化反应等，得到了（2S，3S）-2-甲基-3-苄氧基丁醛，收率为56.3％。

D-proline was ob tamed from the asymmetric transformafion of L-proline via the formation of-tartaric acid salt by using butanal as catalyst.

以L-脯氨酸为起始原料，S-酒石酸为拆分剂，运用不对称转换的方法合成D-脯氨酸。

Acetic acid ethenyl ester, polymer with ethenol, cyclic acetal with butanal

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Furthermore, the main volatiles rom Hippophae rhamnoides included Nonane, Octane, 3-methyl-1-Butanol, Pentanal, 2-methyl- Butanal, 2-Hexen-1-ol, 2-Hexenyl benzoate in close natural state.

在近自然状态下，壬烷、辛烷、3-甲基丁醇、戊醛、2-甲基丁醛、2-壬烯醇、2-苯甲酸叶醇酯为沙棘枝叶主要挥发物组分。

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 is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。