In our research on study chemical reaction of active methylene compounds and brom-acetophenone. Because of brom-acetophenone is compound that contain carbonyl and halogen ,which will take place electrophilic substitution and nucleophilic addition. When active methylene compounds are ethyl acetoacetate and β-diketone, controlling reaction condition, we have found that mono-substitution's production and di-substitution's. production is isolated; active methylene compounds are acetoacetanilide and acetoacetanilide derivate, pyrrolidin-2-one derivants were obtained by substitution and close-ring reaction .but there is no report about it.

本文是讓活潑亞甲基類化合物與溴代苯乙酮發(fā)生化學(xué)反應(yīng)欧美AAAA在线视频免费观看，由于溴代苯乙酮是含有羰基的鹵代烴結(jié)構(gòu)还能看的AV网站，它可以發(fā)生親電取代和親核加成反應(yīng)xigouqi.com，當(dāng)活潑亞甲基類化合物為乙酰乙酸乙酯和β-二酮時(shí)亚洲欧美日韩中文另类，控制反應(yīng)條件可以發(fā)生單取代和雙取代兩種產(chǎn)物亚洲熟女精品一区二区三区；當(dāng)活潑亞甲基類化合物為乙酰乙酰芳胺類化合物來反應(yīng)時(shí)国产精品福利在线观看入口，溴代苯乙酮中的羰基與氨基會(huì)發(fā)生分子內(nèi)的關(guān)環(huán)反應(yīng)生成吡咯烷-2-酮衍生物，這在以前的研究中是沒有發(fā)現(xiàn)的樱桃视频ios下载。

Thus, 3 mol of Ethyl acetoacetate were treated with 2 mol of formaldehyde to yield 80% of I.

用2摩爾的甲醛處理3摩爾的乙酰乙酸乙酯可得到80%的I机械有限后入高潮。

The condensation of 3-Ethoxyphthalide was also conducted with ethyl acetoacetate and ethyl cyanoacetate.

對(duì)3位延伸出一個(gè)和兩個(gè)碳原子的胺類衍生物的質(zhì)譜裂解規(guī)律進(jìn)行了探討。

When MAA yeast was used to catalyze other systems, such as reducing ethyl 4-chloroacetoacetate to ethyl-4-chloro-3-hydroxybutyrate and ethyl acetoacetate to ethyl-3-hydroxybutyrate, the yield also improved at various degrees.

用此酵母在水相中催化乙酰乙酸甲酯的還原国产美女高潮流白浆视频18，其得率較普通面包酵母要高久久毛片网站。pH和溫度對(duì)MAA酵母與普通面包酵母都有相同的影響。

For the α-arylation of ethyl acetoacetate, the product was α-aryl ethyl acetoacetates, rather than ethyl a-arylacetates which are the major products in other catalytic systems.

較為惰性的氯代芳烴在Pd2/L1的催化下国产日B视频网站，也能夠跟1乱伦小说网尤物视频亚洲，3-二羰基化合物發(fā)生α-芳基化反應(yīng)。

Optically active ethyl-3-hydroxybutyrate,a useful chiral synthon,was prepared by stereoselective reduction of ethyl acetoacetate of the bread yeast in organic solvent.

利用面包酵母在非水相中不對(duì)稱還原乙酰乙酸乙酯国产h视频网站在线视频，制備了光學(xué)活性的手性化合物S-3-羥基丁酸乙酯摸女生下体高潮喷水视频。

The optimum reaction conditions were: the molar ratio of ethyl acetoacetate to ethylene glycol was 1:1.8,the quantity of catalyst was equal to 2% ethyl acetaoacetate,amount of cyclohexane was 20mL,and the rea...

在優(yōu)化條件下反應(yīng)，蘋果酯收率達(dá)到93.1%最新亚洲日韩中文字幕在线播放一区二区，選擇性接近100%一级a作爰片A级毛片。實(shí)驗(yàn)表明，磺化炭是合成蘋果酯的優(yōu)良催化劑乱子国产刺激，與其他酸催化劑相比无码欧XXXX在线观看，它還具有活性高bbixx.com、用量少、無污染等突出的優(yōu)點(diǎn)日韩欧美A片一级久久72。

For the α-arylation of ethyl acetoacetate, the product was α-aryl ethyl acetoacetates, rather than ethyl α-arylacetates which are the major products in other catalytic systems.

較為惰性的氯代芳烴在Pd2/L1的催化下国产色视频一区，也能夠跟1，3-二羰基化合物發(fā)生α-芳基化反應(yīng)黄页视屏在线看。

Base played a crucial role in this reaction: in the Pd2/L1 catalyzed α-arylation of ethyl malonate, K3PO4 is the base of choice; in the α-arylation of ethyl acetoacetate, K2CO3 is the most effective base.

在這類催化反應(yīng)中日韩欧美中文精品第一页，堿的選擇具有重要的影響：以K3PO4為堿， Pd2/L1催化體系在丙二酸二乙酯的α-芳基化中色色av无码，富電子溴代芳烴顯示較好的活性思思精品视频； Pd2/L1催化的乙酰乙酸乙酯α-芳基化時(shí)，以 K2CO3為堿欧美黄色小视频在线，催化體系顯示較好的活性久久精品伊人不卡一区，這個(gè)催化體系可控制反應(yīng)得到α-芳基乙酰乙酸乙酯，而不是脫乙豕荷患妒悠得夥眩基的產(chǎn)物黄色网站av在线免费观看。

Methyl-l, 3-oxazine-2,4-dione are prepared from ethyl acetoacetate and ethyl carbamate at 140 for 6h, catalysted by zinc acetate, giving to 48.8% yields which is 33% more than the literature value.

選用醋酸鋅作催化劑，使乙酰乙酸乙酯與氨基甲酸酯在140℃反應(yīng)6h国产福利在线99，合成6-甲基-1色综合综合热视频，3-噁嗪-2，4-二酮一级毛片A片免费播放，產(chǎn)率達(dá)48.8％99人人摸人人干，較文獻(xiàn)報(bào)道值高出了33％。