Ⅰ.新的2-取代环戊-2-烯酮的合成和茉莉酮类化合物的合成 Ⅱ.钩吻素子合成的研究

在第一部份的工作中,作者发现了一条新的2-取代环戊-2-烯酮的合成路线。自环戊二烯出发,以聚氧乙烯类衍生物为相转移催化剂,固体氢氧化钾为碱,制得一系列取代环戊二烯;将烷基取代环戊二烯在甲醇溶液中与溴加成后接着酸性水解,得到纯度为95％以上的2-取代环戊-2-烯酮。检测并讨论了反应中间体和产物的生成机理,对戊基取代环戊二烯的     

挂式-四氢双环戊二烯热裂解产物分布研究

研究了常压下, 温度为450～650 ℃, 停留时间为15.44～4.03 s条件下的JP-10 (挂式-四氢双环戊二烯)热裂解产物分布. 在相对较长的停留时间下, JP-10热裂解转化率对温度很敏感. 热裂解主要产物为甲烷、乙烯、丙烯、丁烯、丁二烯、环戊二烯、苯、甲苯、苯乙烯、环戊烯的乙烯基取代物及C5, C6异构体(戊二烯、环戊烯的甲基取代物、环己烯、己二烯和环戊二烯甲基取代物), 其中, C1～C4、环戊二烯、苯、甲苯、乙烯基取代环戊烯为初始产物.     

陶瓷先驱体含锆聚硅烷的电化学合成与表征

采用电化学合成法,以三氯甲基硅烷、氯丙烯、环戊二烯和四氯化锆为单体合成出含锆聚硅烷,通过FTIR,UV,NMR,XRD等表征了其结构.测定了产物的各元素含量和双键含量,以及分子量和分子量分布,并对产物进行了交联固化和高温裂解实验.结果表明,含锆聚硅烷双键保留率为10.8%,锆含量为4.11%.含锆聚硅烷能溶于常见的溶剂...     

C_5馏分及其羰化产物的毛细管气相色谱分析

石油裂解副产物C5馏分及其羰化产物是成分较为复杂的混合物,尤其是C5馏分中1,3-环戊二烯和顺-1,3-戊二烯的物性更为接近。用SE－54弹性石英毛细管柱和角鲨烷玻璃毛细管柱分别对C5馏分及其羰化产物进行了分析,使各组分达到了很好的分离。     

艾地苯醌的简便合成

借鉴Hammamura等提出的醌与环戊二烯进行Diels-Alder反应后, 可将醌羰基α-非酸性的烯氢原子转化为羰基α-氢的原理, 将辅酶Q0(5)与环戊二烯的Diels-Alder反应产物(6)在叔丁醇钾-THF体系中, 与以1,10-癸二醇(1)为原料制成的衍生物(4)进行缩合, 再经逆Diels-Alder反应, 得到艾地苯醌, 该方法步骤简洁、条件温和、重现性好、收率较高.     

C~s-三高立方烷-8,11-二酮-1,9-二羧酸酯衍生物的合成

详细研究了对苯醌-2,5-二羧酸酯与环戊二烯衍生物的Diels-Alder反应, 所得Diels-Alder加成物经光环化便得到预期的C~s-三高立方烷衍生物. 但加成物6的光环化则给出Paterno-Buchi加成产物7.     

1, 5-二芳酰基环戊二烯的制备

本文报道了用二(环戊二烯基)氯化钇与芳烃酰氯反应,用DME作溶剂,在室温下生成单一产物,1,5-二芳酰基环戊二烯的新方法。     

取代苄基五甲氧羰基环戊二烯的合成和晶体结构

五甲氧羰基环戊二烯基钾和取代苄基卤化物反应, 合成了七个新型苄基取代五甲氧羰基环戊二烯。由^1H NMR、IR、元素分析等确认R(苄基)和环戊二烯上碳直接相连, 具有典型的碳碳连结。对产物之一, 1-萘亚甲基五甲氧羰基环戊二烯的X射线衍射测定, 进一步肯定了上述结论。化合物为单斜晶系, 空间群为P2/n, a=0.9731(1), b=1.7403(3), c=1.465(3)nm; β=95.70(1)^°, v=2.4712nm^3, D~c=1.334g/cm^3, 最终的R=0.093, 萘亚甲基环与环戊二烯基环的二面角为68.19^°。     

1-甲基-1-丙基-3-丁烯基环戊二烯基稀土二氯化物的合成

丁烯基环戊二烯基稀土氯化物;1-甲基-1-丙基-3-丁烯基环戊二烯基稀土二氯化物的合成     

金属环状卡宾配合物首次合成

美国加州大学(圣地亚哥)化学家J.M.O’Connor和研究生Lin Pu用铱的一种金属环状物和3-丁炔-1-醇反应,在产物中得到了以2-噁环戊二烯为配体的配合物,这是首次合成的稳定金属环状卡宾配合物。Delaware     

Anodic synthesis and properties of polyaminothiazole

The possibility of electrooxidative polymerization of 2-aminothiazole in aqueous and organic media is studied using the cyclic voltammetry method. Anodic synthesis conditions are found that provide the polyaminothiazole conducting film synthesis on platinum and tin dioxide electrodes. IR and electron spectroscopy studies show that the polymer synthesized on the electrode surface contains fragments of π-conjugated bonds that provide optical absorption in the visible region and electrochemical activity of the film. A scheme is suggested for the reactions of oxidative coupling of 2-aminothiazole.     

Electrooxidative C–H thiocyanation of hetarenes: voltammetric assessment of thiocyanogen reactivity

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Towards click chemistry: Multicomponent reactions via combinations of name reactions

In this report, we try to show the importance of incorporation of name reactions in the sequential cascade reaction in which significantly decreasing the number of steps towards an ideal and practical multi-step synthesis of natural products as well showing virtually all the advantages already mentioned for “Click Chemistry”. In addition, since the chiral inductions are desired for most of these sequential name reactions, their asymmetric catalyzed reactions were also described.     

Recent advances in ionic liquids: green unconventional solvents of this century: part II

Abstract

In the second part of our paper, further recent developments of ionic liquids in selected name reactions of carbonyl chemistry such as Mannich, Reformatsky, Cannizaro, Streacker, Barbier, Pechmann, etc. are described.     

Competitive thermal ene reaction and Diels-Alder reactions of 2-[N-(alk-2-enyl)benzylamino]-3-vinylpyrido[1,2-a]pyrimidin-4(4H)-ones

Thermal reaction of 2-[N-(alk-2-enyl)benzylamino]-3-(2-substituted and 2,2-disubstituted)vinylpyrido[1,2-a]pyrimidin-4(4H)-ones gave azepine, the desired ene products, and/or pyran derivatives. The formation of the latter was responsible for the [4+2] cycloaddition reaction between the α,β-unsaturated ester carbonyl moiety as a diene part and the alkenylamino moiety as an ene one. The reaction features depended upon the kinds of substituents both on the vinyl and alkenyl counterparts; strongly electron-withdrawing substituents on the vinyl moiety or an electron-donating substituent on the alkenyl one changed the reaction feature from the ene reaction to the hetero Diels-Alder reaction.     

Palladium bis(2,2,6,6-tetramethyl-3,5-heptanedionate) catalyzed Suzuki, Heck, Sonogashira, and cyanation reactions

Palladium bis(2,2,6,6-tetramethyl-3,5-heptanedionate): a structurally well-defined O-containing transition metal complex is reported as an efficient catalyst for Suzuki, Heck, and Sonogashira cross-coupling reactions. The protocol was also applied successfully for cyanation of aryl halides under milder operating conditions. The system tolerated the coupling of various aryl halides with alkenes, alkynes, and organoboronic acid along with the cyanation of aryl halides providing good to excellent yields of desired products.     

Boehmite@tryptophan‐Pd nanoparticles: A new catalyst for C–C bond formation

A boehmite@tryptophan‐Pd nanoparticulate catalyst was prepared by a simple, fast and convenient route. The nanomaterial was characterized using various techniques and employed as a thermally stable catalyst for Heck, Stille and Suzuki cross‐coupling reactions. Optimized conditions for these reactions are described. The catalyst could be isolated, post‐reaction, by simple filtration and recycled for several consecutive cycles without a notable change in its activity.     

Oxa-Michael加成反应的研究新进展

Oxa-Michael加成反应是一类重要的反应, 经常被用于天然产物的合成, 但该反应直到近几年才被深入研究. 简要综述了oxa-Michael加成反应的研究进展.     

Tandem Hass-Bender/Henry reaction for the synthesis of dimethylnitro alcohols from benzylic halides

Dimethylnitro alcohols are constructed in a one-pot process from benzylic halides and 2-nitropropane. The use of tetrabutylammonium fluoride (TBAF) as the promoter is essential for this tandem Hass-Bender/Henry reaction to proceed.     

温度和时间对有机合成反应影响的探讨

根据物理化学和有机合成原理,从动力学、热力学、反应机理及溶解度等各方面详细分析了反应温度和反应时间对有机合成反应的影响。通过这些分析,可以让同学们更好地在合成反应课程的学习中掌握和分析反应温度和反应时间对反应的影响。