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.

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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.

接種量不同會(huì)導(dǎo)致代謝BCAA的產(chǎn)物不同：接種量為10~9 cfu/ml時(shí)生成相應(yīng)的醛和酸看一级毛片一区二区三区免费；接種量為10~8 cfu/ml時(shí)生成相應(yīng)的醇、酸和酯色综合视频久久。S52菌株在40℃欧洲精品欧美精品，pH 7.0，無(wú)亞硝酸鹽和NaCl的情況下產(chǎn)3-甲基丁醛的量最多人人摸人人交。

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

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

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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.

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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.

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