Nor-seco-cucurbit[10]uril(ns-CB[10])is a kinetic product with unique structure.The single bridged methylene in its structure makes the molecular cavity of ns-CB[10]more deformable when compared to ordinary cucurbit[n]...Nor-seco-cucurbit[10]uril(ns-CB[10])is a kinetic product with unique structure.The single bridged methylene in its structure makes the molecular cavity of ns-CB[10]more deformable when compared to ordinary cucurbit[n]uril,reducing its structural stability.Repeated experiments showed that ns-CB[10]gradually cracks in an acidic solution and changes the specificity of cucurbit[5]uril(CB[5])and cucurbit[8]uril(CB[8])under more robust acidic solutions and when heated.A series of experiments were designed to study the transformation behavior of ns-CB[10].It was found that the concentration of ns-CB[10]was correlated with the content distribution of CB[5]and CB[8].This study explores the influencing factors and mechanisms of the transformation of ns-CB[10]to CB[5]and CB[8].The results are of great significance for the application of ns-CB[10],understanding the formation mechanism of cucurbit[n]urils.Furthermore,it provides a new pathway for synthesizing new cucurbit[n]urils.展开更多
以固体硅胶为硅源考察了六亚甲基亚胺(HMI)和环己胺(CHA)二元胺模板剂对分子筛合成产物的影响.XRD测试结果表明,当晶化温度为160℃,晶化时间为84 h,SiO2/Al2O3摩尔比为30,Na2O∶H2O∶(HMI+CHA)∶SiO2摩尔比为0.11∶45∶0.35∶1时,即使HM...以固体硅胶为硅源考察了六亚甲基亚胺(HMI)和环己胺(CHA)二元胺模板剂对分子筛合成产物的影响.XRD测试结果表明,当晶化温度为160℃,晶化时间为84 h,SiO2/Al2O3摩尔比为30,Na2O∶H2O∶(HMI+CHA)∶SiO2摩尔比为0.11∶45∶0.35∶1时,即使HMI仅占二元胺模板剂的25%(摩尔分数),所得分子筛仍为MCM-22;其它条件相同时,以单纯CHA为模板剂得到的是ZSM-35分子筛.用13C MAS NMR研究了HMI和CHA的状态,结果表明在单一HMI合成体系中,HMI既起MCM-22结构导向作用,又经质子化后起稳定骨架的作用;而在HMI和CHA二元胺体系中,HMI主要起结构导向作用,CHA则填充在MCM-22层间十元环中稳定骨架.展开更多
A synthetic process of rimantadine hydrochloride was reported.It was started from adamantane, via intermedium 1 bromoadamandine, 1 adamantane methyl ketone, then reacted with formamide and finally hydrolyzed. The cost...A synthetic process of rimantadine hydrochloride was reported.It was started from adamantane, via intermedium 1 bromoadamandine, 1 adamantane methyl ketone, then reacted with formamide and finally hydrolyzed. The cost was low and the process was simple,the overall yield being 53.8%.This procesis valuable for industrie application.展开更多
A new high energetic density material,N-acetyl-3,3-dinitroazetidine(ADNAZ),was synthesized with advantages as low melting point,high density,insensitive to detonation on impact and forming a eutectic with TNAZ which c...A new high energetic density material,N-acetyl-3,3-dinitroazetidine(ADNAZ),was synthesized with advantages as low melting point,high density,insensitive to detonation on impact and forming a eutectic with TNAZ which can be shaped charge antitank weapons or be used energetic carrier for higher melting meaterial such as HMX and the like.ADNAZ was synthesized by a five-steps reaction,using nitromethane,paraformaldehyde and tert-butylamine etc.as starting materials,with overall yield of 42.8%.Some factors affecting yield of ADNAZ was also discussed.The structures of intermediates and ADNAZ were confirmed by IR,HNMR,CNMR and MS.展开更多
基金financial support of National Natural Science Foundation of China(No.22161010)。
文摘Nor-seco-cucurbit[10]uril(ns-CB[10])is a kinetic product with unique structure.The single bridged methylene in its structure makes the molecular cavity of ns-CB[10]more deformable when compared to ordinary cucurbit[n]uril,reducing its structural stability.Repeated experiments showed that ns-CB[10]gradually cracks in an acidic solution and changes the specificity of cucurbit[5]uril(CB[5])and cucurbit[8]uril(CB[8])under more robust acidic solutions and when heated.A series of experiments were designed to study the transformation behavior of ns-CB[10].It was found that the concentration of ns-CB[10]was correlated with the content distribution of CB[5]and CB[8].This study explores the influencing factors and mechanisms of the transformation of ns-CB[10]to CB[5]and CB[8].The results are of great significance for the application of ns-CB[10],understanding the formation mechanism of cucurbit[n]urils.Furthermore,it provides a new pathway for synthesizing new cucurbit[n]urils.
文摘以固体硅胶为硅源考察了六亚甲基亚胺(HMI)和环己胺(CHA)二元胺模板剂对分子筛合成产物的影响.XRD测试结果表明,当晶化温度为160℃,晶化时间为84 h,SiO2/Al2O3摩尔比为30,Na2O∶H2O∶(HMI+CHA)∶SiO2摩尔比为0.11∶45∶0.35∶1时,即使HMI仅占二元胺模板剂的25%(摩尔分数),所得分子筛仍为MCM-22;其它条件相同时,以单纯CHA为模板剂得到的是ZSM-35分子筛.用13C MAS NMR研究了HMI和CHA的状态,结果表明在单一HMI合成体系中,HMI既起MCM-22结构导向作用,又经质子化后起稳定骨架的作用;而在HMI和CHA二元胺体系中,HMI主要起结构导向作用,CHA则填充在MCM-22层间十元环中稳定骨架.
文摘A synthetic process of rimantadine hydrochloride was reported.It was started from adamantane, via intermedium 1 bromoadamandine, 1 adamantane methyl ketone, then reacted with formamide and finally hydrolyzed. The cost was low and the process was simple,the overall yield being 53.8%.This procesis valuable for industrie application.
文摘A new high energetic density material,N-acetyl-3,3-dinitroazetidine(ADNAZ),was synthesized with advantages as low melting point,high density,insensitive to detonation on impact and forming a eutectic with TNAZ which can be shaped charge antitank weapons or be used energetic carrier for higher melting meaterial such as HMX and the like.ADNAZ was synthesized by a five-steps reaction,using nitromethane,paraformaldehyde and tert-butylamine etc.as starting materials,with overall yield of 42.8%.Some factors affecting yield of ADNAZ was also discussed.The structures of intermediates and ADNAZ were confirmed by IR,HNMR,CNMR and MS.
