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五苯基苯基硅化合物及其原料苯乙炔基硅化合物的合成 总被引:2,自引:1,他引:1
近年来,我们从事多苯基芳基类有机硅化合物的合成。并发现这类化合物对有机硅高聚物的热稳定性有一定的影响[1.2]。本文研究了五苯基苯基硅化合物的合成。其主要方法是以苯乙炔基有机硅化合物与四苯基环戊二烯酮为原料,通过Diels-Alder反应来合成的。有的文献认为苯乙炔基硅烷由于电子效应与位阻关系,除苯乙炔基三甲基硅烷外,一般不容易与四苯基环戊二烯酮进行缩合[3]。根据我们的实验却得到了较好产率的各种五苯基苯基有机硅化合物,而且产物也易于分离。同时我们还对原料苯乙炔基甲基二乙氧基硅烷的合成进行了研究。 相似文献
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多苯基三联苯有机硅化合物的合成及其对聚合物耐热性影响的研究 总被引:1,自引:0,他引:1
本文通过Diels-Alder反应合成了1,4-双(2′,3′,6′-三苯基,4′-四甲基乙烯基二硅氧基苯基)苯(简称Ⅰ)和1,4-双(2′,3′,6′-三苯基,4′-三乙氧基硅基苯基)苯(Si称Ⅱ)两种新的多苯基三联苯有机硅单体,产率均为80%左右,并作了下列耐热性研究,其结果:(1)把化合物(Ⅰ)作为硅橡胶的热稳定剂,所得硅弹性体在300℃×150小时老化后,具有较好的耐热性和机械性能;(2)化合物(Ⅱ)可以做室温胶的交联剂,所得胶片在300℃×48小时老化,仍保持好的弹性。 相似文献
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共合成了13个含硅四配位二硫代磷酸酯和2个含硅四配位单硫代磷酸酯的新化合物,经元素分析、IR、1HNMR、MS确定了新化合物结构,对部分化合物进行了生物活性的测定,结果表明个别化合物有较好的生物活性。 相似文献
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本文将meso-苯基四苯并卟啉锌(Zn-PnTBP n=1~4)在酸性条件下脱锌,获得了不含金属离子的meso-苯基四苯并卟啉(H2PnTBP n=1~4)。研究了它们的吸收光谱、荧光光谱及在溶液状态下的瞬态光谱特性,并对照相应的锌卟啉,讨论了两者之间的光谱差异。 相似文献
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本文用含硅氢键化合物与含双键的氟化合物的加成反应,制备了一系列未见报导的含氟有机硅化合物。在用氯丙烯与2,2,3,3-四氟丙醇制2,2,3,3-四氟丙基烯丙醚时,对方法进行了改进,提高了产率。本文还报道了含氟有机硅聚合物方面的工作。 相似文献
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Gerhard Maas Prof. Dr. 《Angewandte Chemie (International ed. in English)》2009,48(44):8186-8195
Diazo compounds (R1R2C?N2) are known as versatile and useful substrates for an array of chemical transformations and, therefore, diazo chemistry is still far from losing anything of its long‐standing fascination. In addition to many studies on the subsequent chemistry of the diazo group, the inventory of methods for the preparation of diazo compounds is continuously supplemented by new methods and novel variations of established procedures. Several of these synthetic approaches take into account the lability and remarkable chemical reactivity of certain classes of diazo compounds, and environmentally more benign procedures also continue to be developed. 相似文献
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Ye Eun Kim Yoo Jin Lim Chorong Kim Yu Ra Jeong Hyunsung Cho Sang Hyup Lee 《Molecules (Basel, Switzerland)》2022,27(19)
The syntheses of novel 1-acyloxyindole compounds 1 and the investigations on reaction pathways are presented. Nitro ketoester substrate 2, obtained in a two-step synthetic process, underwent reduction, intramolecular addition, nucleophilic 1,5-addition, and acylation to afford 1-acyloxyindoles 1 in one pot. Based on the systematic studies, we established the optimized reaction conditions for 1 focusing on the final acylation step of the intermediate 1-hydroxyindole 8. With the optimized conditions, we succeeded in synthesizing 21 examples of new 1-acyloxyindole derivatives 1 in modest yields (Y = 24 − 35%). Among the 1-acyloxyindole compounds, 1-acetoxyindole compounds 1x were generally unstable, and their yields were relatively lower than the other 1-acyloxyindoles. We expect that a bulkier alkyl or aromatic group on R2 could stabilize the 1-acyloxyindole compounds. Significantly, one-pot reactions of a four-step sequence successfully generated compounds 1 that are all new and might be difficult to be synthesized otherwise. 相似文献
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Two new macrocyclic compounds, [Cu2(L)2](ClO4)4·2CH3OH (1) and [Cu(L)](ClO4)2·2H2O (2) (L = 1,3,10,12,15,18-hexaazatetracyclodocosane) were synthesized by condensation reactions involving amines and formaldehyde in the presence of copper anion. Compound 1 crystallizes in triclinic, space group Pí with a = 10.442(2), b = 14.197(3), c = 17.388(4), α = 91.218(4), β = 90.69(3), γ = 93.756(4)o, V = 2520.4(9)3, Z = 2, F(000) = 1260, Dc = 1.589 Mg/m3, Mr = 1205.92, μ = 1.137 mm-1, λ = 0.71073, the final R = 0.0668 and wR = 0.1573 for 9703 observed reflections with I > 2σ(I). Compound 2 crystallizes in monoclinic, space group C2/c with a = 16.911(2), b = 11.4172(15), c = 27.059(4), β = 107.787(2)o, V = 4974.7(12)3, Z = 8, F(000) = 2504, Dc = 1.610 Mg/m3, Mr = 602.92, μ = 1.155 mm-1, λ = 0.71073 , the final R = 0.0419 and wR = 0.1131 for 4374 observed reflections with I > 2σ(I). 相似文献
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J. M. Conia 《Angewandte Chemie (International ed. in English)》1968,7(8):570-577
There are three important direct routes to cyclopropylcarbonyl compounds: 1. Cyclization of chains of three carbon atoms, the first or third of which is adjacent to a carbonyl or potential carbonyl carbon atom (this type includes syntheses by intramolecular alkylation of γ-halogeno ketones or related compounds in alkaline media); 2. insertion of a methylene group or substituted methylene group into the olefinic double bond of an α,β-unsaturated carbonyl compound; and 3. introduction of an acetonyl group into the double bond of an olefin. However, cyclopropylcarbonyl compounds can also be obtained from 1,2-epoxycyclobutane and 2-bromocyclobutanone derivatives by ring contraction. Another possibility is the dehalogenation of α,α-bis(bromomethyl) cycloalkanones. This review concludes with a discussion of these little known routes and of a particularly suitable method which involves the reaction of methylene iodide, a Zn? Cu couple, and α,β-unsaturated ketones. 相似文献
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以羰基衍生物,取代1,3-二羰基化合物,脲和硫脲为原料,经固定化青霉素酰化酶催化的Biginelli反应合成了22个四氢嘧啶类化合物(1a~1v),其中1s和1v为新化合物,其结构经1H NMR, 13C NHR和IR表征。研究了溶剂、反应温度、反应时间和物料比γ[n(苯甲醛) :n(脲) :n(乙酰乙酸乙酯)]对1a产率的影响。结果表明:在最佳反应条件(固定化青霉素酰化酶为催化剂,乙醇为溶剂,γ=1.0 :1.5:1.0,于50 ℃反应6 h)下,1a产率最高(85%)。 相似文献
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New chiral aminoamidoximes were prepared from (L)-proline, (L)-alanine, and (L)-isoleucine by treatment of the corresponding aminonitriles with hydroxylamine in the presence of triethylamine. The intramolecular cyclization with α-bromoacid chlorides and aldehydes was investigated to give new 1,2,4-oxadiazin-6-ones and 1,2,4-oxadiazoles, respectively. These compounds were likely to undergo an intermolecular cyclization through oxygen and nitrogen. However, intramolecular cyclization through two nitrogens did not occur even after changing reaction conditions. 相似文献
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Syntheses and Liquid Crystal Properties of New Rare Earth Sandwich-Type Heteropoly Compounds 总被引:2,自引:0,他引:2
BI Li-hua LIU Jing-hua WANG En-bo HUANG Ru-dan YU Yong-zhang WU Ping-song 《高等学校化学研究》1999,15(4):364-366
IntroductionSincesandwich-typecompoundsofformula[M4(H2O)2(P2W15O56)2]n-werefirstlyde-scribedbyFinkeetal.[1],adozenofthiskindofcompoundshavebeensynthesized[2,3],inwhichmostofthecenteratomsweretransitionmetals,suchasMn2+,Fe3+,Co2+,Ni2+,Cu2+,Zn2+,Cd2+,a… 相似文献
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几种硝基苯甲酸卟啉酯类化合物的合成 总被引:1,自引:0,他引:1
卟啉化合物在模拟光合作用、探索高效利用太阳能等方面具有重要的理论意义和应用前景[1]。近年来,人们对共价键相连的“卟啉-醌”类化合物研究较多,而关于“卟啉-硝基”类化合物的报道则较少,硝基具有强吸电子等特性,它作为“卟啉-硝基”类化合物的电子受体有利于分子内发生电子传递,可望是光合作用机理研究中的一类较好的模型化合物。为此,我们设计合成了具有不同性质的供体和不同位置的受体的8种新硝基苯甲酸及苯甲酸卟啉酯类化合物,它们的结构已分别通过质谱、核磁、红外、紫外可见光谱以及元素分析确证,结果见表1、2。 相似文献