共查询到19条相似文献,搜索用时 62 毫秒
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胆酸酯及其甲基丙烯酸衍生物的制备 总被引:1,自引:0,他引:1
以HCl为催化剂,合成了脂肪族二元醇单胆酸酯(2~5)。运用甲基丙烯酰氯和甲基丙烯酸酐作酰化试剂,三乙胺作缚酸剂,4-(二甲氨基)吡啶作催化剂,合成了分子中含有不同数量甲基丙酰基的胆酸衍生物(6~9)。实验结果表明,当用甲基丙烯酰氯作酰化剂时,2~5分子中羟基的反应活性顺序是:CH2-OH>3-OH>12-OH>7-OH。 相似文献
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胆酸甲酯(甲基)丙烯酰基衍生物的合成 总被引:1,自引:1,他引:0
以(甲基)丙烯酰氯为酰化剂,三乙胺做缚酸剂合成了分子中含有1~3个(甲基)丙烯酰基的胆酸衍生物。结果显示,以酰氯作酰化试剂,胆酸甲酯分子中3个羟基的反应活性顺序是:C3-OH>C12-OH>C7-OH。 相似文献
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鹅去氧胆酸是天然的初级胆汁酸,是鸡、鸭和鹅等家禽胆汁中的主要有机成分,具有杀菌、抗炎和溶解胆结石等作用,是临床上治疗胆固醇结石的药物之一,也是合成临床上治疗胆结石疾病用量最大的药物熊去氧胆酸的原料。鹅去氧胆酸在医药方面的应用价值促使其制备方法逐步完善。近年来,关于鹅去氧胆酸衍生物的研究越来越多,相关研究也延伸到生物医药、分子识别和功能材料等多个领域,尤其在生物医药领域,鹅去氧胆酸衍生物显示出广阔的应用前景。本文系统地综述了鹅去氧胆酸的提取、合成与化学修饰方法,以及鹅去氧胆酸衍生物的合成、性质及应用,并展望了其发展前景。 相似文献
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目前比较好的利用太阳能资源的是单晶硅或多晶硅太阳能电池,晶硅太阳能电池虽然具有转换效率高,稳定性好的特点,但是成本非常高。自然界最普遍的利用太阳能的例子是光合作用,光合作用虽然不是最高效的固定太阳能的方式,但是它是最广泛地固定的太阳能,最大量地生产可利用能源。 相似文献
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Shu Xian MENG Ya Qing FENG Wen Jin LI Cai Xia YIN Jin Ping DENG 《中国化学快报》2006,17(7):981-984
Chitosan, which is easily derived from chitin by N-deacetylation. It is well known that hypercholesterolemia has been identified as a major risk factor in the development of atherosclerosis and its clinical sequelae like coronary heart disease and myocard… 相似文献
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In order to develop novel spirocyclic tetronic acid lead compounds, a series of new spirocyclic tetronic acid derivatives containing oxime ether moiety was synthesized and bioassayed. The structures of 16 target compounds were characterized by 1H NMR spectra, 13C NMR spectra and high-resolution mass spectrometer(HRMS). Preliminary bioassays indicated that most of the title compounds displayed excellent insecticidal activity against Aphis fabae and Nilaparvata lugens at 100 mg/L. In particular, compound 6k showed the similar activity(LC50=6.87 mg/L) against A. fabae as the spirotetramat(LC50=4.56 mg/L) and had better effects(LC50=1.64 mg/L) against N. lugens in comparison with spirotetramat(LC50=7.90 mg/L). The study showed that compound 6k exhibited more promising and broad-spectrum insecticide activity and may serve as a new insecticidal agent for sucking pests. 相似文献
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Squaric acid (dihydroxycyclobutenedione), the dianion of which may be regarded as a novel aromatic system, has recently become readily accessible by simple syntheses. The acidic character of squaric acid manifests itself in the formation of salts and of lower alkyl esters, which can be converted into the amides. Squaric acid dichloride shows in its reactions typical acyl chloride behavior. Condensation of squaric acid with pyrrole, phenol, and azulene derivatives yields cyclotrimethine dyes. 相似文献
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