共查询到17条相似文献,搜索用时 62 毫秒
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以对溴苯胺为原料,经重氮化、Gomberg-Bachmann偶联、硼酸化反应得到4-(2-吡啶基)苯硼酸;再与对氟苯基取代的咔唑,通过四(三苯基磷)钯催化,于90℃进行Suzuki偶联合成出标题磷光配体,收率82.03%。对目标物用核磁共振氢谱和元素分析进行了表征,并测得它在二氯甲烷中的紫外吸收光谱和荧光光谱。由于受咔唑基团的影响,磷光配体最大吸收峰波长红移56 nm,且吸收的强度增加,Stokes位移154 nm,相对荧光量子效率为0.17。 相似文献
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双-[3-(三乙氧基)硅丙基]四硫化物的合成及应用 总被引:4,自引:0,他引:4
用γ 氯丙基三乙氧基硅烷 (CPOS)、钠、硫及含硫化合物合成双 [3 (三乙氧基 )硅丙基 ]四硫化物 ,找出了最佳工艺条件 :m(CPOS)∶m(Na)∶m(Na2 S)∶m(S) =72∶(2 .5~ 3)∶15∶(15~ 18) ;温度控制在 75℃ ;回流 4h。w (S) =2 2 3% ,转化率达 96 %以上。经多家用户检验和使用 ,在橡胶中补强和粘合作用良好 ,质量稳定 相似文献
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以溴苯为起始原料,经过格氏反应,偶联反应,加成反应,酸催化闭环合成了2-溴-9,9'-螺二芴,最后与二苯基膦锂锂化反应合成目标化合物二苯基-2-(9,9'-螺二芴基)膦,总收率为60.6%。通过1H NMR确证了目标化合物的结构。 相似文献
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A series of optically active 3-(9-alkylfluoren-9-yl)propene oxides were synthesized by the reaction of 9-alkylfluoren-9-yllithium with the optically active epichlorohydrin at −70 °C and polymerized using KOH as an initiator. The molecular weight of the poly(3-(9-alkylfluoren-9-yl)propene oxide)s is larger than that of poly(4,4,4-triphenyl-1-butene oxide), which had been proved to take stable helical conformation in solution, and their molecular weight distributions were narrower (Mw/Mn = 1.02 to 1.09) than poly(4,4,4-triphenyl-1-butene oxide). By investigating of chiroptical properties of a series of polymers derived from optically active epoxide, it is suggested that the poly(3-(9-alkylfluoren-9-yl)propene oxide)s keep one-handed helical conformation in solution. 相似文献
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Optically active helical poly[(R or S)-3-(9-alkylfluoren-9-yl)propene oxide]s (poly-AFPOs) were used to induce the enantioselective addition of methyllithium to aldehydes. The addition of methyllithium to 4-methoxybenzaldehyde gave the highest enantioselectivity (88% ee) under the inducement of poly-AFPOs. Poly-AFPOs could be recovered simply by pouring the reaction mixture into methanol in the end of the reaction and separating the precipitated polymer via filtration. The recovered poly-AFPOs could be reused for many times to induce the enantioselective addition of methyllithium to aldehyde without losing their enantioselective inducement ability. The investigation of the optical rotation and the MALDI-ToF MS confirmed that, in the enantioselective addition induced by poly-AFPOs, the lithium cation was embedded in the hole of the helical column of poly-AFPOs, leaving the negative methyl ion outside the one-handed helical column. The methyl anion abutted tightly against the helical polymer and acquired a chiral environment. It was this helically chiral environment that resulted in the enantioselective inducement of the addition reaction. 相似文献
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2-(2-氨基苯并[d]噻唑-6-基)苯并[d]噁唑-5-胺(化合物1)在氩气保护下,与N,N'-羰基二咪唑反应生成活性中间体,再与乙胺反应得到目标化合物1-(2-(2-氨基苯并[d]噻唑-6-基)苯并[d]噁唑-5-基)-3-乙基脲,其结构经1H NMR、13C NMR和HRMS确证.考察N,N'-羰基二咪唑的用量、... 相似文献
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研究了一种用于治疗骨质疏松症药物的关键中间体米诺膦酸的制备方法.实验以二乙氧基膦酰乙酸乙酯和2,2-二甲氧基乙醛为起始原料,经维蒂希-霍纳反应、水解、环合、水解4步制备得到标题化合物.其熔点与1HNMR和文献报道的结果一致,总收率87.5%(以2-氨基吡啶计).该方法克服了文献报道的工艺缺陷,与现有技术相比,后处理更简单,更适合工业化生产. 相似文献
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以2-氨基-4-羟基-5-甲氧基苯甲酸甲酯(化合物2)和1-(3-羟丙基)四氢吡咯(化合物3)为原料,通过光延反应得到2-氨基-5-甲氧基-4-[3-(吡咯烷-1-基)丙氧基]苯胺(化合物1).通过1H-NMR和ESI-MS对化合物1的结构进行了表征,并对反应条件进行了优化.确定的最佳的反应条件为:反应溶剂为四氢呋喃,... 相似文献