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文章合成了具有一维链状结构的[Pb(H_4bna)(DMF)(H_2O)]_n 2nDMF(H_4bna=1,1′-联萘-2,2′-二羟基-3,3′-二羧酸)这种新型MOF材料,并进行了红外光谱、元素分析、热重分析及X-ray衍射等表征。 相似文献
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以2-萘酚和80%水合肼为起始原料,经3步反应合成了光学活性的2,2'-二胺-1,1'-联萘。在缚酸剂存在下,将所得光学活性的二胺与甲基丙烯酰氯反应制备得到目标产物(R)-2,2'-二甲基丙烯酰胺-1,1'-联萘。各步产物的结构经核磁分析得到确认。研究了水合肼与2-萘酚的投料比对中间体2-萘肼收率的影响,以及缚酸剂类别、反应温度对目标产物收率的影响,得到了一种适宜的合成工艺路线。 相似文献
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以(S)-(-)-1,1'-联萘-2,2'-二酚为原料,经三氟甲基磺酸基保护后与二苯基氧膦偶联,最后经三氯硅烷还原得到(S)-(-)-2,2'-双二苯基膦基-1,1'-联萘,采用~(31)PNMR、~1HNMR和HRMS对目标化合物进行结构表征,通过考察各步的反应条件,得出最佳的工艺条件:n〔(S)-(-)-1,1'-联-2-萘酚二(三氟甲磺酸酯)〕∶n(二苯基氧膦)∶n(1,4-二氮杂二环[2.2.2]辛烷)∶n〔Ni(dppe)Cl_2〕∶n(HSiCl_3)=1∶2.1∶2.5∶0.1∶3,在催化偶联步骤反应温度为100℃,反应时间为48 h,三氯硅烷还原步骤加热回流5 h,得到手性2,2'-双二苯基膦基-1,1'-联萘的收率可达82.3%,e.e.值为99.3%。 相似文献
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以叔丁醇为原料,优化了其与浓盐酸氯代合成叔丁基氯的反应,采用CaCl2 氯化盐助催化体系使反应收率提高到95%,产品质量分数为99%;3,3-二甲基-1-丁烯合成的关键步骤是叔丁基氯与乙烯反应制备3,3-二甲基-1-氯丁烷,探讨了催化剂用量、反应温度对反应收率的影响.反应以无水三氯化铝为催化剂,用量为n(AlCl3):n[(CH3)3CCl]=0.018:1,反应温度为-17~-20 ℃时,产物3,3-二甲基-1-氯丁烷的收率可达80%;最后由3,3-二甲基-1-氯丁烷脱氯化氢制备3,3-二甲基-1-丁烯.考察了不同溶剂对反应收率的影响,以聚乙二醇-400为溶剂,无需加入相转移催化剂,收率可达88.5%,3,3-二甲基-1-丁烯的质量分数为可达95%以上. 相似文献
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《Inorganic chemistry communications》2007,10(8):884-887
The crystal structure of 3,3′-bi-1,2,4-oxadiazole (1) reveals a planar centrosymmetric structure for this molecule in the solid state. It forms a mononuclear complex (3) with palladium(II) chloride, which is shown by X-ray crystallography to contain the ligand chelated through the two N4 nitrogens. The X-ray structure of the complex (5) with silver(I) nitrate shows a one-dimensional coordination polymer in which the ligand acts in a bridging mode, again with coordination through the N4 nitrogen atoms. 相似文献
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3,3-二乙氧基丙腈是合成维生素B1、胞嘧啶及其衍生物等重要化合物的前体。综述了3,3-二乙氧基丙腈的合成方法,包括酰胺脱水、金属氰化物取代、醚化和异噁唑法,用于工业化生产较为满意的合成路线是以1,1,3,3-四乙氧基丙烷为原料的异噁唑法。 相似文献
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The solubility parameter of poly(oxetane), poly(3,3-dimethyloxetane) and poly(3,3-diethyl oxetane) has been estimated by measuring solution viscosities. Values of δ = 9.4, 7.9, and 7.9 cal1/2·cm?3/2 for each polymer were obtained and compared with those calculated from empirical methods. The 3-dimensional solubility parameter approach has been also applied in order to get additional information on the effect of structural modifications on the main chain in the solubility behavior. 相似文献
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采用气相色谱法对3,3-二甲基丁醇产品进行分析,建立了毛细管色谱柱气相色谱内标法定量分析方法。在筛选色谱柱和优化色谱条件的基础上,选用Hp-225(φ0.25mm×0.25μm×30m)毛细管色谱柱测定3,3-二甲基丁醇产品含量。结果表明,目标组分分离效果良好。通过内标法对标准试样进行定量测定,目标组分重复测定5次的相对标准偏差均小于2%,回收率在98.96%-100.87%之间,表明方法的精密度和准确度良好。该方法为3,3-二甲基丁醇生产企业分析检测提供了一种快速、可靠的方法。 相似文献
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It has been shown that some N-alkyl derivatives of Aspartame (1) are enhanced sweetening agents [1]. In particular, the 3,3-dimethylbutyl derivative, 2, (Neotame) is about 70?times sweeter than Aspartame. With this in mind a research program directed toward the synthesis of 3,3-dimethylbutanal (3) was begun. The first phase of this research involved the synthesis of 3,3-dimethylbutanol (4) by the acid catalyzed alkylation of isobutene with ethylene to give the sulfate ester [2] which was readily hydrolyzed to the alcohol, 4, in isolated yields in the 70?C75?% range. It was found that the most efficient method for the conversion of 4 to the aldehyde, 3, was by a vapor phase dehydrogenation over a copper catalyst. The effect which the reaction variables have on the production of 4 will be discussed. This will include factors such as the ethylene pressure, the acid/isobutene ratio, the use of a hydrocarbon solvent, the reaction temperature and the mode of addition of the isobutene. The discussion of the dehydrogenation procedure will include the nature of the catalyst used and the reaction parameters needed to maximize the formation of 3 and keeping the amount of the over-oxidation carboxylic acid product below 1?%. 相似文献
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