The behavior of 1, 6 - enyne in the presence of transition metal catalysts had been extensively studied. 1, 6 - enyne cycloisomerization reactions catalyzed by transition metals and three different reaction pathways, namely cyclometalation, halorhodation and - allyl rhodium route, divided according to the reaction mechanism are summarized and discussed
摘要1 , 6 -
烯炔底物在過渡金屬催化劑作用下的化學行為得到了廣泛的研究,重點是關于過渡金屬催化的1 , 6 -
烯炔環異構化反應,從反應機理角度入手,把1 , 6 -
烯炔環異構化反應按啟動方式總結為三類,關對這三種方式啟動的1 , 6 -
烯炔構化應進行了詳細地總結和闡述。
Results of ethynylation were influenced by factors, such as, reaction temperature, reaction time, variety of solvent, and amount of alkali
反應溫度、反應時間、溶劑種類和堿用量等因素均對萜
烯基丙酮乙
炔化反應結果有影響。
The yields of dehydronerolidol, dehydrogeranyllinalool, and dehydroisophytol, under suitable conditions of ethynylation of the three terpenylacetones, were 85. 7 %, 86. 7 %, and 74. 4 %, respectively
在合適的反應條件下, 3種萜
烯基丙酮乙
炔產物,脫氫橙花叔醇、脫氫香葉基芳樟醇和脫氫異植物醇的得率分別為85 . 7 % 、 86 . 7 %和74 . 4 % 。
Current status and prospect of industrial production of vinyl acetate by synthesis method from calcium carbide - acetylene
電石乙
炔法工業生產聚乙
烯醇的現狀與展望
Benjingyingbu founded in may 1994. with more than 10 years of business experience, primarily operating specifications imports, and domestic mingyousanjiadai, conveyor belt transmission belt gabujiaoguan, fengyaguan, oxygen tubes yiqueguan, suliaobianzhi guanjixiangjiaoban, gujiayoufeng, o xingjuanhugezhong xiangjiaozajian, nilongbangban, halons bangbandengxiangjiao, plastic products
本經營部成立於1994年5月,具有十幾年的經營經驗,主要經營各種規格進口、國產名優三角帶,輸送帶,傳動帶,夾布膠管,風壓管,氧氣管,乙
炔管,塑料編織管及橡膠板,骨架油封, o型圈和各種橡膠雜件,尼龍棒板,聚四氟乙
烯棒板等橡膠、塑料製品。
Widely applied in the drying process of natural gas and petroleum gas, especially the advanced drying of gases like petroleum pyrolysis gas, ethylene, propylene, butadiene and acetylene, liquids like ethanol and acetone. in medical treatment and food industry, it can also be used as drying agent
3a分子篩廣泛應用於天然氣和石油氣乾燥工藝中,尤其是石油裂解氣,乙
烯、丙
烯、丁二
烯、乙
炔等氣體的深度乾燥,可用於液體(如乙醇、丙酮)的乾燥,在醫療、食品等行業中也可用作乾燥劑。
The nifh sequence similarity between isolates t7 and paenibacillus odorifer was 97 %. the 7 isolates with nifli gene were tested for their nitrogenase activity using acetylene reduction assay ( ara ). isolates c4, g2, t7 and w5 showed nitrogenase activity, whereas nitrogenase activity was not detected in the isolates c5, gl and t1 and suitable conditions for demonstrating nitrogenase activity for them remain to be found
採用乙
炔還原方法對這7個菌株的固氮酶活性進行了測定,其中4個菌株具有固氮酶活性,菌株g2和t7的固氮酶活性相對來講比較高,分別達到660 . 0nmol乙
烯mg蛋白和292 . 5nmol乙
烯mg蛋白,但用同樣方法卻沒有測出菌株g1 、 t1和c5的固氮酶活性,它們的最佳固氮條件還有待于發現。
A research summary of vinyl acetate synthesis from acetic acid and acetylene catalyzed by active carbon - zinc acetate
乙
炔法氣相合成醋酸乙
烯催化劑的研究綜述
This paper outlines the research overview of reaction mechanism of vinyl acetate synthesis from acetic acid and acetylene catalyzed by active carbon - zinc acetate, and reviews the researches on the catalyst supporter, the major metal catalyst, the promoters and the deactivation mechanism at home and abroad
摘要從乙
炔法氣相合成醋酸乙
烯的反應機理入手,綜述了醋酸鋅活性炭催化劑的載體、活性組分、助劑以及失活機理的國內外研究情況。
Experiment indicates that polyflon membrane is an excellent medium for the main malfunction gas ( acetylene ) permeation
實驗表明,聚四氟乙烯是對主要的故障氣體(乙炔)進行滲透的非常好的介質。