Alkylamine reaction with dialkyl cyanodithioiminocarbonate was catalyzed by quaternary ammonium salts at room temperature to yield 3-alkylamine-5-amino-1,2,4-triazole in good quality and high yields. After imidization and reaction with an α,β-unsaturated acid derivative, the reaction intermediate was hydrolyzed in the presence of a Lewis acid to obtain the target product.

烷基胺與氰基亞胺硫代二甲酯在季氨鹽催化作用下得到質(zhì)量好、收率高的3-烷氨基-5-氨基-1欧美熟妇被草，2能看欧美黄色网站能看，4-三氮唑，進(jìn)一步經(jīng)過亞胺中間體并與α人人操人人看人操，β-不飽和酸酯作用后黄色不良网站十八岁以下禁止入内，中間產(chǎn)物在Lewis酸催化作用下水解得到三唑嘧啶酮。

Furthermore, the polymerization of benzonitrile catalyzed bydifferent Lewis acid and zinc was also investigated.

測定了以Lewis酸和幾種金屬催化苯甲腈聚合的反應(yīng)速度91KCM国产在线精品，結(jié)果表明金屬的活性次序為：鎂＞鋅＞鈉＞鈣黄大片一级。

The polymerization rate of benzonitrile catalyzed by Lewis acid and differentmetals was measured, and the activity of metals was in thefollowing decreasing order, magnesium, zinc, sodium, calcium.

發(fā)現(xiàn)Lewis酸-金屬體系對芳香族腈是一種較好的催化劑，聚合速度比Lewis酸單獨催化時有大幅度提高久久久夜色精品国产热热。

This thesis is constituted by four parts: In the first part a summarization is given on the main total synthetic methods of isoflavones, for example, deoxybenzoin method which generally involves two steps wherein a phenol is reacted in the presence of a Lewis acid with phenylacetic acid to generate an intermediate deoxybenzoin which is then cyclized with a one carbon electrophile.

本論文主要工作包括四部分：第一章綜述了近年來全合成異黃酮的主要方法：脫氧安息香法操你视频，是以多羥基苯酚與苯乙酸或苯乙腈在Lewis酸存在下，反應(yīng)生成中間體脫氧安息香香蕉高清影视一级在线观看，然后再與親電碳試劑進(jìn)行關(guān)環(huán)反應(yīng)生成異黃酮一级在线视频了。

The results indicated that new Lewis acid ferric potassium alum was a green catalyst for the synthesis of ethyl lactate.

研究了新型Lewis酸鐵鉀礬的制備人人操,人人弄，并以該Lewis酸為催化劑，通過乳酸和乙醇反應(yīng)合成乳酸乙酯18无码AAA片免费看，考察了催化劑用量五月婷婷丁香综合网、反應(yīng)時間、酸醇物質(zhì)的量比對酯化率的影響黄色一级免费福利。

The rate enhancement in homogeneous Suzuki reaction by Lewis acid has been investigated.

研究了Lewis酸在Suzuki反應(yīng)中的促進(jìn)作用欧美一级久久，考察了Lewis酸、溶劑及堿性試劑對目的產(chǎn)物收率的影響国产主播在线小蝌蚪，并優(yōu)化了反應(yīng)條件国产一级a免费无码视频。

The role of the oxidant Ce4 in these reactions seemed ambiguous as it could also act as a Lewis acid.

在這個反應(yīng)中A片在线一区看，由于Ce4作為氧化劑的同時又兼具Lewis酸的酸性中文字幕xfplay男人资源站，因此，在反應(yīng)的探索過程中人人看人人射人人操，我們一直無法確定到底是Lewis酸催化的離子反應(yīng)還是電子轉(zhuǎn)移引發(fā)的自由基反應(yīng)接離子反應(yīng)青青青国产中文在线视频免观看。

The IR sp ectra of adsorbed pyridine showed that most of the acid sites on the surface of the catalyst are Lewis acid sites.

吸附吡啶的紅外光譜證明該催化劑的表面酸點多為Lewis酸點。

There exist Lewis base sites (M=O and M-O-M or M-O-P) and Lewis acid sites on the surface of these catalysts.

催化劑表面的活性基元由Lewis堿位M=O鍵的端氧和M-O-M或M-O-P鍵的橋氧位欧美日大黄片，Lewis酸位M〓組成成人免费va视频。

The results showed that there existed Lewis base sites (M=O and M-O-Fe) and Lewis acid sites on the surface of these catalysts.

研究表明，F(xiàn)e-V-O国产91精品宾馆、Fe-Mo-O试看120秒免费体验区真人、Fe-P-O和Fe-Al-P-O催化劑表面活性基元都是由Lewis堿位（M=O鍵的端氧和M-O-Fe鍵的橋氧位）和Lewis酸位組成。