The results showed that, both diene and alkaline nitrogen-containing compounds had negative influence on the aromatization stability of the catalyst.

用小型固定床加壓反應(yīng)器研究了液化石油氣（C4 LPG）中的丁烯在納米ZSM-5型催化劑DLG-1上的低溫芳構(gòu)化反應(yīng)黄色视频高清无码国产，重點考察了原料中二烯烴和堿性氮雜質(zhì)，以及反應(yīng)溫度黄片对白3qA片对白3p、壓力和C4 LPG進料重量空速條件對催化劑芳構(gòu)化反應(yīng)活性及穩(wěn)定性的影響亚洲国产精品一区二区免在线。

Therelationship of the amount of catalyst and the ee% of product was seen to be negative nonlin-ear. Catalyst 3 was used in the enantioselective addition of diethylzinc to aromatic aldehydesand gave good results. The configuration of products was determined by the configuration ofthe catalysts' chiral carbon linked with hydroxy group. Using β- amino alcohols bearing only one chiral center as catalysts for the enantiose-lective addition were studied. D-N, N-dialkyl-2-amino butanol gave poor catalytic effect be-cause of their structure. The configuration of the product is the same as the catalyst. Anotherkind of β- amino alcohols - phenylglycine derivatives and valine derivatives have chiralcenter on the carbon linked with amino group. Catalyzed by-phenylglycine derivatives 6,7, 9, 10, the reactions gave satisfied results. The optical yields exceeded 80%.

在探討了含有兩個手性中心的β-氨基醇之后久久精品国产99国产精2020丨，選擇了只有一個手性中心的β-氨基醇，一是手性中心為連羥基的手性碳原子：D-N日韩精品欧美大片资源在线观看网站，N-二烷基-2-氨基丁醇丁香五月人人妻人人爽；二是手性中心為連氨基的手性碳原子：D-苯基甘氨酸衍生物和L-纈氨酸衍生物。D-2-氨基丁醇的催化效果不太好国产精品爆乳福利在线观看不卡，這與其結(jié)構(gòu)的空間位阻較小有關(guān)系在线观看黄片免费观看，反應(yīng)產(chǎn)物與連羥基手性碳構(gòu)型一致；由苯基甘氨酸和纈氨酸出發(fā)合成五種β-氨基醇6-10国内永久网址，研究了不同ee％的-6作用下的二乙基鋅-苯甲醛加成反應(yīng)亚洲狠狠艹，發(fā)現(xiàn)該催化劑具有不對稱放大效應(yīng)；-7最新a片视频网站，9亚洲男人的天堂网址，lO的催化效果也比較令人滿意，光學(xué)產(chǎn)率80％以上欧美中文字幕日韩综合四季，所得產(chǎn)物構(gòu)型與催化劑構(gòu)型一致未满十八禁止进入。

By comparing the dehydration methods of three catalytic esterification reactions and the catalysts used under negative pressure, the better method of synthesizing 2 ethylhexyl chloroacetate is using stannous oxide as catalyst under negative pressure.

通過對三種催化酯化反應(yīng)的脫水方法及負(fù)壓下使用不同催化劑的比較和選擇99riav在线，提出了以氧化亞錫為催化劑負(fù)壓脫水合成氯乙酸2乙基己酯的方法欧美又粗又长的A片在线观看。

negative catalyzer：阻化劑

negative catalyst 負(fù)催化劑 | negative catalyzer 阻化劑 | negative causal link 負(fù)因果鏈