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固液相烃基化反应的研究 I.以碳酸钾为碱的丙二酸乙二酯和氰乙酸乙酯的烃基化反应 总被引:1,自引:0,他引:1
The alkylation of diethyl malonate and ethyl cyanoacetate using powdered potassium carbonate asa base in the absence of solvent and other catalyst is studied. The features of this method are: simple preparative procedure, reproducible yield and easy control of monoalkylation. The reaction mechanism is discussed briefly. 相似文献
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甲基酮与丙烯腈反应可以得到一氰乙基、二氰乙基或多氰乙基化产物。据文献报道,丙酮与丙烯腈反应可以得到少量的4-乙酰基庚二腈,产率约为3.7%,其他4-酰基庚二腈的合成方法还未见报道。我们发现由β-二酮的氰乙基化反应得到的β-二酮二氰乙基化产物1a~c,在碳酸钠水溶液中酮解可以得到4-酰基庚二腈2a~c,产率为59~82%。如果1a~c在氢氧化钾水溶液中水解,则得4-酰基庚二酸3a~c。2a~c与2,4-二硝基苯肼反应得到了相应的苯腙4a~c,2a~c经KOH水解亦得3a~c。 相似文献
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本文报道在交叉分子束装置中, 研究氧原子和CF2=CFCl, CF2=CFBr,CF2=CH2的反应。在O(^3p)和CF2=CFBr(或CF2=CFBr)反应中, 首次观察到反应生成的CF2(^3B1)的发射光谱, 而在O与CF2=CH2反应中, 用激光诱导荧光方法检测到CFH卡宾, 确定了在此反应中CFH卡宾的生成, 这一结果未见文献报道。并根据这些结果, 分析和讨论了在这些反应中, 生成CF2(^3B1)和CHF卡宾的机理。 相似文献
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测定了2-(2'-苯并咪唑基)乙酸乙酯及3-(2'-苯并咪唑基)丙酸乙酯在DMSO-水、1,4-二氧六环-水混合溶剂体系中的碱性水解动力学。随着DMSO-H~2O混合溶剂中DMSO含量增加,两种酯水解表观速率常数分别呈现出不规则的钟形变化。实验结果与我们所提出的酯水解历程中既包括分子间氢氧根离子特殊碱催化又包括分子内苯并咪唑基一般碱催化两种催化方式相符合。 相似文献
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Sixteen new halogenoethylaminoacidato Pt(II) complexes were synthesized and characterized, of which eightiodo complexes (PtA2I2) (A = DL-a-AlaOEt, L-a-alaOEt, DL-a-PheOEt, L-a-PheOEt, DI-A-AspOEt, L-a-AspOEt, DL-a-SerOEt and L-a-Lys OEt), four chloro compounds (PtA2Cl2)(A = DL-a-PheOEt, DL-a-AspOEt, L-a-Asp OEt) and (DL-a-PheHOEt)2(PtCl4) were obtained by reaction of K2 (PtX4)(X = I^-, Cl^-) with the corresponding ethylaminoacidates in water. The other chlorethylaminoacidato Pt(II) complexes (PtA2Cl2) (A = DL-a-AlaOEt, L-a-AlaOEt, L-a-PheOEt, DL-a-Ser OEt) were synthesized in acetone by exchange reaction of the corresponding iodo complexes with AgCl in order to avoid hydrolysis of the ethyl aminoacidates. Molar conductivity determination showed that all the Pt(II) complexes obtained were neutral molecules with the exception of (DL-a-PheHOEt)2(PtCl4) which existed as an anion. As shown by diole moment determination and modified thiourea reaction, iodo complexes 1-7 and some of the chloro complexes (PtA2Cl2) (A = DL-a-alaOEt, D-a-AlaOEt, DL-a-SerOEt) were of cis-configuration and the other chloro complexes were of trans-configuration. 相似文献
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在[Cu^2+(OH^-)TMEDA]2Cl2^-催化下(TMEDA为N, N, N', N;-四甲基乙二胺),α-氰基-P-X苯基乙酸乙酯(X=OCH3, CH3, Cl, H和NO2)经氧化偶联反应, 获得高产率的二聚体。产物中meso异构体的含量均大于dl异构体的含量。IR, 1H NMR和EPR对反应过程进行研究, 结果表明, 反应机理为底物以CN取代催化剂中的OH^-, 生成反应中间体配合物, OH-夺取底物的α-H, 产生相应的碳负离子, 碳负离子向Cu^2+单电子转移生成自由基, 自由基偶合而生成产物。氧将Cu^+氧化为Cu^2+, 使反应继续进行。 相似文献
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在甲苯中,以Sm(i-PrO)~3(10%)为催化剂,β-酮酸乙酯与烯丙醇进行酯交换反应得到中等产率的β-酮酸烯丙酯。 相似文献