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2-氟-4-(反式-4-烷基环己基)苯基硼酸的合成 总被引:2,自引:0,他引:2
以1-(反式-4-烷基环己基)-3-氟苯与丁基锂、硼酸三丁酯、叔丁醇钾为反应物合成了2-氟-4-(反式-4-烷基环己基)苯基硼酸化合物3个,总收率为52%~56%,分别用IR,1HNMR对其结构进行了鉴定。优化了反应条件:n[1-(反式-4-烷基环己基)-3-氟苯]∶n(叔丁醇钾)∶n(丁基锂)∶n(硼酸三丁酯)=1∶2∶1.2∶1.5,反应温度-85~-90℃,反应时间2.5 h。叔丁醇钾的加入使反应时间由7 h缩短至2.5 h。 相似文献
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采用两步法合成了5,15-二-(五氟苯基)-10,20-二(2-吡啶基)自由卟啉分子,探讨了反应过程中催化剂用量、反应温度及反应时间对目标产物产率的影响。结果表明,制备中间产物双吡咯基五氟苯基甲烷时,催化剂BF3·Et2O与五氟苯甲醛的物质的量之比为1∶15,制备目标产物的反应温度为145℃,反应时间为1 h,在该条件下目标产物的产率最高达到33.6%。通过MS,IR,UV-Vis,1HNMR,19FNMR及EA测试技术对产物进行了表征,在470 nm的光激发下,该化合物最强发射峰位于711 nm,可以作为潜在的发光材料。 相似文献
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以3,4-二氟硝基苯为原料,与吗啉在二异丙基乙胺中反应4 h得到3-氟-4-吗啉硝基苯(Ⅰ),在w(Pd)=10%催化下,Ⅰ与甲酸铵在V(THF) V(甲醇)=1 4中反应6 h,得3-氟-4-吗啉苯胺(Ⅱ),Ⅱ与光气在通入干燥HCl气体下反应得3-氟-4-吗啉异氰酸苯酯(Ⅲ),最后在无水LiBr和n-Bu3PO催化下,Ⅲ与(R)-丁酸缩水甘油酯在二甲苯中反应2 h,所得产物在甲醇钠催化下,与甲醇反应3 h,合成了(R)-3-(3-氟-4-吗啉苯基)-2-氧-5-(口恶)唑烷基甲醇(Ⅳ),总收率35.8%. 相似文献
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以3,4,5-三氟苯酚、3,5-二氟-4'-烷基联苯为原料,经酚羟基保护反应、丁基锂/碘甲烷上甲基反应、Williamson醚化反应等5步反应最终合成4-[二氟(3,4,5-三氟-2-甲基-苯氧基)甲基]-3,5-二氟-4'-烷基联苯类化合物。纯化后目标产物的气相色谱纯度≥99.5%,总收率约为47%,结构经~1HNMR及GC-MS确证。其中,合成2-(3,4,5-三氟-2-甲基-苯氧基)四氢吡喃适宜的物质的量比为n(2-(3,4,5-三氟苯氧基)四氢吡喃)∶n(丁基锂)=1∶1.2,3,4,5-三氟-2-甲基苯酚和4-溴二氟甲基-3,5-二氟-4'-烷基联苯醚化反应的最优化条件为在DMSO中反应4 h。将该化合物添加到液晶的基础配方中,能降低旋转粘度(γ1),提高液晶的响应速度,增加介电各向异性(Δε),降低阈值电压。 相似文献
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以对氟苯酚为原料,经甲基化、溴化和格氏反应3步合成标题化合物,含量99.073%(HPLC),总收率约57%,产物结构通过1HNMR和IR验证。其中溴化反应的最佳条件为n(对氟苯甲醚)∶n(水)=1∶55,n(对氟苯甲醚)∶n(溴素)=1∶1.30,反应温度为25℃;格氏反应的最佳反应条件为n(2-溴-4-氟苯甲醚)∶n(镁)∶n(硼酸三丁酯)=1.0∶1.1∶1.6,其中酯化一步的温度控制在-10℃左右,滴加格氏试剂的速率控制在400 mL/h左右。该法具有反应条件温和、生产成本低和有利于工业化生产等特点。 相似文献
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以新蒸馏过的环己烯和丙酰氯为原料,与三氯化铝和氟苯一起采用“一锅法”制备4-(4-丙酰基环己基)-氟苯。首先将环己烯与丙酰胺的混合物在搅拌下于-10℃逐滴加入到三氯化铝的氟苯悬浮液中,而后将该反应混合物在40℃下搅拌反应2h即可得4-(4-丙酰基环己基)-氟苯。环己烯、丙酰氯、三氯化铝、氟苯投料摩尔比为1∶1∶1.5∶2。第二步反应是用黄鸣龙法将4-(4-丙酰基环己基)-氟苯还原为4-(反-4-正丙基环己基)-氟苯。最后经减压蒸馏和数次重结晶得到纯度大于99.5%的产品4-(反-4-正丙基环己基)-氟苯。 相似文献
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(R)-醇腈酶催化法合成(R)-(-)-1-(2-萘基)-2-N-甲基氨基乙醇 总被引:1,自引:0,他引:1
以2-萘甲醛为原料,经酶致转氰化、氰基还原、甲酰化、酰胺还原合成了光学活性(R)-(-)-1-(2-萘基)-2-N-甲基氨基乙醇5.转氰化过程采用来源于苦杏仁、枇杷仁、桃仁、黑布林果仁和苹果籽仁的醇腈酶催化HCN对底物醛的加成获得(R)-氰醇,通过比较反应产率和产物对映体过量值(ee)发现苦杏仁醇腈酶的催化效果最好,相应值分别为68.8%和88.3%;(R)-氰醇的O-保护衍生物2经化学法转化为标题化合物5,总产率达47%,ee值达88.0%, 其结构经IR和1H-NMR确证.实验结果表明,醇腈酶催化合成的手性氰醇光学纯度较高,是合成手性氨基醇化合物的优秀原料,并且在随后的化学转化过程中各步反应产物均很好地保留了光学纯度. 相似文献
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Vijay Kumar Patel Niraj Kumar Vishwakarma Avnish Kumar Mishra Chandra Sekhar Biswas Biswajit Ray 《应用聚合物科学杂志》2012,125(4):2946-2955
(S)-2-(Ethyl propionate)-(O-ethyl xanthate) (X1) and (S)-2-(Ethyl isobutyrate)-(O-ethyl xanthate) (X2) were used as the reversible addition-fragmentation chain transfer (RAFT) agents for the radical polymerization of vinyl acetate (VAc). The former showed the better chain transfer ability in the polymerization at 60°C. Kinetic study with both RAFT agents showed pseudo-first order kinetics up to around 85% monomer conversion. Molecular weight of the resulting polymer increased linearly with increase in the monomer conversion up to around 85%. The observed molecular weights calculated from 1H-NMR spectrum [Mn(NMR)] are close to the corresponding theoretical molecular weights [Mn(theor)]. The corresponding polydispersity index (PDI) of the resulting polymers remained almost constant at around 1.2 up to ∼ 65% monomer conversion and then increased gradually with the further increase in the monomer conversion. Chain-end analysis of the resulting polymers by 1H-NMR showed clearly that polymerization started with the radical forming out of the xanthate mediator. The negligible homo-chain extension and the hetero-chain extension involving synthesis of poly(VAc)-b-poly(NVP) diblock copolymer were occurred. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 相似文献
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Vijay Kumar Patel Avnish Kumar Mishra Niraj Kumar Vishwakarma Chandra Sekhar Biswas Biswajit Ray 《Polymer Bulletin》2010,65(2):97-110
(S)-2-(Ethyl propionate)-(O-ethyl xanthate) (X1) and the newly synthesized (S)-2-(ethyl isobutyrate)-(O-ethyl xanthate) (X2) were used as the reversible addition-fragmentation chain transfer (RAFT) agents for the radical polymerization
of N-vinylpyrrolidone (NVP). The former showed the better chain transfer ability in the polymerization at 60 °C. Kinetics study
with X1 shows the psuedo-first order kinetics upto 45% monomer conversion. Molecular weight (M
n) of the resulted polymer increases linearly with increase in the monomer conversion upto around 45%. Polydispersity of the
corresponding poly(NVP)s increase gradually from 1.2 to 1.9 with increase in the monomer conversion. Chain-end analysis of
the resulted polymer by 1H NMR shows clearly that polymerization started with radical forming out of xanthate mediator. Living nature of the polymerization
was confirmed from the successful homo chain extension experiment and also the hetero-chain extension experiment involving
synthesis of poly(NVP)-b-polystyrene amphiphilic diblock copolymer. 相似文献
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以吲哚-4-甲醛、对甲基苯肼和对氯苯胺为原料,合成了1-(4-甲苯基)-3-(4-吲哚基)-5-(4-氯苯基)甲臢。经红外、核磁和质谱等波谱鉴定了目标分子的结构,并测定了它的氧化还原电位值。 相似文献
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