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本文报道综合利用长叶烯(1)催化异构化为异长叶烯(2)及合成系列香料的方法;通过氧化反应合成不同香型烯醇酯类等;Prins反应合成系列化合物。鉴定了10种香料化合物的香型。 相似文献
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以4,4'-二溴联苯和苯胺为原料,经钯催化氨基化反应制得N,N'-二苯基联苯胺(1);以1为单体,分别与对二溴苯(2a),4,4'-二溴二苯砜(2b)和4,4'-二溴二苯甲酮(2c)通过钯催化的C-N交叉偶联反应,合成了3个新型的联苯基三苯胺聚合物:联苯基三苯胺苯(3a,收率88%),联苯基三苯胺砜(3b,收率94%)和联苯基三苯胺酮(3c,收率91%),其结构经1H NMR,IR和XRD表征。采用UV-Vis,TG,DSC,荧光光谱和循环伏安法对3a~3c的性能进行了研究。结果表明:3a~3c失重5%的温度分别为479℃,482℃和355℃;玻璃化转变温度分别为199℃,248℃和215℃;λmax分别位于354 nm,359 nm和385 nm;λem分别为489 nm,472 nm和518 nm;EHOMO值分别为-3.96 eV,-3.89 eV,-3.94 eV;ELUMO值分别为-1.16 eV,-1.17 eV和-1.39 eV。 相似文献
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偕二氟烯烃是一类重要的含氟有机化合物,在有机合成化学和药物化学研究领域展现出独特的结构优势.例如,偕二氟烯基可以便利地转化为单氟烯基、二氟烷基、三氟甲基以及其他多种含氟结构.偕二氟烯基结构作为羰基理想的电子等排体在药物设计研究中也有广泛的应用.报道了一种镍促进的电化学还原交叉偶联反应合成功能化的偕二氟烯烃.该反应在非分隔电解槽中进行,在温和的电化学还原条件下,实现了三氟甲基烯烃烯丙基脱氟、氧化还原活性羧酸酯脱羧或者烷基卤化物脱卤素的有机结合.反应可有效避免使用化学计量的金属粉末或有机还原剂.该反应为含偕二氟烯基功能结构的生物活性分子提供了有效的合成途径. 相似文献
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新型5-溴嘧啶衍生物的选择性合成 总被引:1,自引:0,他引:1
对甲苯磺酰氯与三甘醇单甲酯完成酯化反应,再与对溴苯酚缩合制得对溴苯基三甘醇单甲醚(3);3与硼酸甲酯完成取代反应、酸解后在Pd(PPh3)4催化下与5-溴-2-碘嘧啶(5)在甲苯中通过Suzuki偶联反应选择性地合成了5-溴-2-对(甲基三甘醇基)苯基嘧啶(1a),收率73%。以1-十二烯和5为主要原料,通过Suzuki偶联反应,一锅法选择性地合成了5-溴-2-十二烷基嘧啶(1b),收率82%。1a和1b未见文献报道,其结构经1HNMR,13C NMR和MS表征。 相似文献
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Walter Fink 《Helvetica chimica acta》1975,58(5):1464-1465
The reaction of Fe2(CO)9 with 1,2-bis(dimethylsilyl)benzene, 1,2,4,5-tetrakis(dimethylsilyl)benzene and vic-tetrakis(dimethylsilyl)benzene affords bis(silyl)chelate complexes of iron. 相似文献
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介绍了带羟基桥连双-(中环多胺)的合成。首先利用N-对甲苯磺酰基-3-羟基-1,5-二氮杂环庚烷与5种双官能基化合物在N2气氛下于无水乙腈中反应,得到5种带对甲苯磺酰基的中环多胺,然后利用HBr/HOAc脱去保护基团,得到桥连双-(中环多胺)的氢溴酸盐。所有新化合物的结构均经IR、1HNMR、MS或元素分析证实。 相似文献
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Min Wang Jennifer M. Weinberg Karen L. Wooley 《Journal of polymer science. Part A, Polymer chemistry》1999,37(18):3606-3613
Geminal silyl ester linkages were used for the backbone construction of linear polymers, which exhibit rapid cleavage in the presence of atmospheric water. A series of poly(gem-silyl ester)s with two ester groups flanking each silicon atom were synthesized, in order to probe the effects of different silyl-substituted side-chain groups upon the physical and chemical properties. The transsilylation condensation reaction of bis(trimethylsilyl) terephthalate with dichlorodiisopropylsilane, dichlorodicyclohexylsilane, dichloromethyl-n-octadecylsilane, and dichloromethyl-4-methylphenethylsilane gave the four poly(gem-silyl ester)s with two isopropyl, two cyclohexyl, one methyl plus one octadecyl, and one methyl plus one 4-methyl-phenethyl side-chain groups per silicon, respectively. The polymers were characterized by NMR (1H, 13C, and 29Si), infrared spectroscopy (IR), size-exclusion chromatography (SEC), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Hydrolytic degradation studies of the polymers solvated in tetrahydrofuran and as bulk samples in the solid state were performed in the presence of atmospheric water as the nucleophilic cleavage agent, and the molecular weight loss was monitored by SEC. Poly(diisopropylsilyl terephthalate) (1a) and poly(dicyclohexylsilyl terephthalate) (1b) were found to be more stable towards nucleophilic degradation in comparison to poly(methyl-n-octadecylsilyl terephthalate) (1c) and poly(methyl-4-methylphenethylsilyl terephthalate) (1d), due to the presence of sterically bulky isopropyl or cyclohexyl groups attached to the silicon atoms. All of the polymers degraded into small molecules upon hydrolysis, with the exception that the degradation products of 1c and 1d self-condensed in the solid state to form the respective polysiloxanes. © 1999 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 37: 3606–3613, 1999 相似文献
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《Journal of heterocyclic chemistry》2017,54(2):1611-1618
Synthesis of some new bis(isoxazoline) derivatives has been described from terepthaldehyde derived bis(nitrones) using microwave irradiation via 1,3‐dipolar cycloaddition reaction. Bis(isoxazoline) derivatives in turn successfully converted into new bis(aziridine) derivatives via Baldwin rearrangement. Simple reaction methodology, non involvement of catalysts, and good to excellent yields are the important features noticed in this synthesis. 相似文献
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Synthesis of Mono- and Bis(silyl)hydroxylamines Silylamines reacts with hydroxylaminehydrochlorid to give the monosilylhydroxylamines: R2FSiONH2 (R = CMe3 1 ), R2R′SiONH2 (R = CMe3, R′ = Me 2 ), R2(NH2)SiONH2 (R = CMe3 3 ). The reaction of 1 in the present of HCl-acceptors or the reaction of lithiated 1 with Me3SiCl or F2Si(CMe3)2 leads to the formation of bis(silyl)hydroxylamines, (Me3C)2FSiONHSiMe3 4 , and (Me3C)2FSiONHSiF(CMe3)2 5 . The lithium derivatives of Me3SiONH2 and 2 react with fluorosilanes to the bis(silyl)hydroxylamines: Me3SiONHSiFRR′ (R = R′ = CMe3, 6 , R = CMe3, R′ = F 7 , R = R′ = NMeSiMe3 8 ), (Me3C)2MeSiNHOSiFRR′ (R = CMe3, R′ = F 9 , R = (Me3C)3C6H2, R′ = F 10 , R = R′ = CMe3 11 , R = R′ = CHMe2 12 ). The bis(silyl)hydroxylamines 4 and 6 are structure isomers. 相似文献