可溶性聚合物支载手性噁唑烷-2-硫酮的合成

以N-Boc-L-酪氨酸乙酯为手性原料,经四步反应制备(S)-4-[4′-(对乙烯基苄氧基)苯基]噁唑烷-2-硫酮单体,以偶氮二异丁腈作为引发剂,与苯乙烯溶液聚合制备线性聚苯乙烯支载(S)-4-[4′-(对乙烯基苄氧基)苯基]噁唑烷-2-硫酮手性辅助试剂,总产率42%。该手性辅助试剂在CH2Cl2,THF,DMF等良溶剂具有很好的溶解性,进行均相不对称诱导反应,在甲醇等贫溶剂中不溶,反应完毕后,通过甲醇等溶剂沉淀洗涤,方便分离纯化和重复使用。     

线型聚苯乙烯支载手性咪唑烷酮的制备

以N-叔丁氧羰基-L-酪氨酸乙酯为原料,经系列反应制备(S)-4-[4′-(对乙烯基苄氧基)苄基]-1-苯基-2-咪唑烷酮手性单体,用AIBN作引发剂,与苯乙烯溶液聚合制备线型聚苯乙烯支载的手性咪唑烷酮,用IR、1H-NMR、13C-NMR及元素分析对其结构进行表征,所得数据与其结构相吻合。     

手性4-苯基-2-噁唑烷酮的合成研究

从L-苯甘氨酸出发,经过酯化、还原、缩合三步合成(S)-( )-4-苯基-2-噁唑烷酮总收率达到了70%。目标产物的结构经过IR、HNMR和MS确证。     

2-噁唑烷酮的合成

用尿素和氨基乙醇为原料，以DMF为反应溶剂合成了2-噁唑烷酮。产品结构经红外和核磁共振氢谱确认。研究了主要反应条件对合成收率的影响，确定了最佳反应条件为：尿素、氨基乙醇和DMF的物质的量之比为1：1：3．42，反应温度为170℃，反应时间为6h。在此条件下，产品2-噁唑烷酮的收率可达85％以上。反应溶剂DMF可回收利用，产品收率不下降。简化了后处理过程，只需少量无水乙醇洗涤产品即可，节约了成本，适宜工业化生产。     

微波催化合成2-噁唑烷酮

利用微波催化制备2-噁唑烷酮,分别考察了物料比、反应温度、反应时间等参数,得到最佳反应条件为:以N,N-二甲基甲酰胺为溶剂,微波功率400W,物料比n(尿素):n(乙醇胺):n(DMF)=1:1:3.42,在120℃下保温2h,然后升温至140℃保温0.5h,最后升温至150～160℃反应5h。在此条件下,2-噁唑烷酮收率达52.1%。     

2-噁唑烷酮合成的工艺研究

本文研究了2-唑烷酮的合成，产品收率为58．2％，纯度为86．4％。对原料配比、溶剂用量、反应温度及反应时间等影响因素进行了探讨，确定了较佳的反应条件。     

2-噁唑烷酮及其衍生物的应用与合成

介绍2-噁唑烷酮的应用及几种不同的合成方法，并加以简单比较。同时介绍2-噁唑烷酮五类衍生物的应用及先进的合成方法。     

噁唑烷酮改性环氧树脂的性能

采用4,4-二苯基甲烷二异氰酸酯(MDI)对双酚A环氧树脂和脂肪族环氧树脂进行噁唑烷酮化共改性,研究了MDI及作为活性稀释剂的脂肪族环氧用量对改性产物黏度及树脂固化物力学性能、耐热性的影响。结果表明,低改性比和稀释剂可以有效降低唑烷酮改性环氧树脂黏度,当改性比为4∶1时,树脂固化物拉伸强度、弯曲强度达到75.4 MPa和158.2 MPa,分别比环氧树脂固化物提高了64%和57%,断裂延伸率和冲击强度有较大提高,具有高强高韧的特点。稀释剂含量对Tg影响较小,各改性树脂Tg在108～118℃之间,与纯环氧树脂的耐热性相当。     

手性催化剂噁唑硼烷酮的合成及催化诱导机理研究

手性噁唑硼烷酮能够催化不对称1,3偶极加成反应并取得很好的效果。手性噁唑硼烷酮以廉价易得的手性氨基酸为原料合成的一系列氮磺酰化氯基酸配体与硼烷原位制备而成．本文主要对手性噁唑硼烷酮的合成,及其不对称诱导机理进行了探讨。     

负载型杂多酸催化剂催化合成油酸正丁酯

制备了以混合氧化物为载体的杂多酸盐催化剂HPA/TiO2MoO3,以油酸和正丁醇为原料,催化合成了油酸正丁酯。确定了该反应的优化条件:醇酸物质的量比2∶1,催化剂用量为反应物总质量的1%,反应时间60min,反应温度130℃以上,在此条件下,油酸正丁酯的酯化率可达98%。     

月桂氮酮的应用与合成

本文介绍了月桂氮艹卓酮在化妆品、医药、农业领域中的应用及几种合成方法     

Dendrigraft polystyrene initiated by poly(p-chloromethyl styrene): synthesis and properties

Dendrigraft polystyrene was prepared using poly(p-chloromethyl styrene) as the multicentre initiator by atom transfer radical polymerization (ATRP). The resulting polymer was characterized with light scattering, intrinsic viscosity, thermal analysis and atomic force microscopy (AFM) imaging. The AFM image showed there were two kinds of different structural dendrigraft polystyrenes in the product, ie the ‘coupling’ dendrigraft polystyrene and ‘free’ dendrigraft polystyrene. The ‘coupling’ structure might result from the coupling reaction of growing radical chain ends. The second virial coefficient A₂ and intrinsic viscosity of the dendrigraft polystyrene were smaller than those of the relative linear and twelve-arm star polystyrene, and the thermal analysis showed that the initial decomposition temperature was a little higher than that of linear polystyrene. © 1999 Society of Chemical Industry     

Synthesis and characterization of benzoylated syndiotactic polystyrene

Benzoylated syndiotactic polystyrene, a functional polymer bearing benzophenone(BP) moiety, has been synthesized in a heterogeneous process by using carbon disulfide as the dispersing medium, and benzoyl chloride and anhydrous aluminum chloride as benzoylating agent and catalyst, respectively. The benzoylation reaction can be well controlled and the resultant polymer was characterized by FTIR and NMR spectroscopy. The incorporation of benzoyl groups into syndiotactic polystyrene was found to have a profound effect on the thermal properties of these new materials. The melting point and the degree of crystallinity decreased by the presence of benzoyl groups, while the glass transition temperature increased.     

聚苯乙烯/二氧化硅杂化材料的原位制备

采用活性负离子聚合法和末端官能化改性技术合成三乙氧基封端聚苯乙烯,然后用溶胶-凝胶法合成聚苯乙烯(PS)/SiO2杂化材料,用红外光谱、凝胶渗透色谱、差示扫描量热法、热重分析、扫描电子显微镜对PS/SiO2杂化材料的结构和性能进行分析。结果表明:PS/SiO2杂化材料中的PS和SiO2间有化学键相连;PS/SiO2杂化材料中的w(SiO2)为25%时,SiO2是粒径约为180 nm,且粒径分布均匀、有完善球形结构的颗粒,其玻璃化转变温度比纯PS高1.3℃,热稳定性较纯PS高。     

3-((E)- 2-丁烯酰基)- 1,3-(口恶)唑烷- 2-酮的合成

用一种新的方法合成了3-((E)-2-丁烯酰基)-1,3-(口恶)唑烷-2-酮,先用(E)-2-丁烯酸与二氯亚砜反应合成(E)-2-丁烯酰氯,再由(E)-2-丁烯酸与(E)-2-丁烯酰氯反应合成(E)-2-丁烯酸酐,最后把(E)-2-丁烯酸酐加入到三乙胺,无水LiCl,1,3-(口恶)唑烷-2-酮的无水四氢呋喃溶液中,在室温下反应5h,正己烷重结晶得3-((E)-2-丁烯酰基)-1,3-(口恶)唑烷-2-酮,产率80%.并确定了反应的最佳条件反应温度为25℃,反应时间为5h,催化剂无水LiCl与1,3-(口恶)唑烷-2-酮的摩尔比为1:1.     

二（2—苯并咪唑亚甲基）胺配合物的合成

本文论述了二（２－苯并咪唑亚甲基）胺及配合物的合成方法,并对配合物进行了元素分析,为研究ＳＯＤ提供了基础和数据。     

合成间同立构PS用单中心催化剂的研究进展

综述了茂金属催化剂和非茂钛催化剂合成间同立构聚苯乙烯的研究进展,其中,茂金属催化剂主要包括茂钛催化剂、单茂钛催化剂、茚钛催化剂、双核金属催化剂及负载型催化剂等。今后的研究重点是负载型茂金属催化剂和非茂钛催化剂,单中心催化剂将对合成间同立构聚苯乙烯的工业化发展发挥重要的作用。     

苯并呋喃-2,3-二酮3-（O-甲基-肟）2-肟合成工艺研究

以4-羟基-3-硝基香豆素为起始原料,经过开环、脱羧,得到2-硝基-2,-羟基苯乙酮,再和甲氧胺盐酸盐反应生成中间体1-（2-羟基苯基）-2-硝基-乙酮-O-甲基肟。最后通过碱性条件下关环得到苯并呋喃-2,3-二酮3-（O-甲基-肟）2-肟。目标化合物及中间体结构经1H-NMR确证。反应总收率70.4%,产品纯度99.2%。该工艺原料廉价,操作简单,收率较高,具有较好的工业化应用前景。     

The atactic polystyrene molecular weight effect on the thermal properties and crystal structure of syndiotactic polystyrene/atactic polystyrene blends

This work examined how the molecular weight of atactic polystyrene (aPS) affects the thermal properties and crystal structure of syndiotactic polystyrene (sPS)/aPS blends using differential scanning calorimetry, polarized light microscopy and wide angle X-ray diffraction (WAXD) technique. For comparative purposes, the structure and properties of the parent sPS was also investigated. The experimental results indicated that these blends showed single glass transition temperatures (T_gs), implying the miscibility of these blends in the amorphous state regardless of the aPS molecular weight. The non-isothermal and isothermal melt crystallization of sPS were hindered with the incorporation of aPSs. Moreover, aPS with a lower molecular weight caused a further decrease in the crystallization rate of sPS. Complex melting behavior was observed for parent sPS and its blends as well. The melting temperatures of these blends were lower than those of the parent sPS, and they decreased as the molecular weight of aPS decreased. Compared with the results of the WAXD study, the observed complex melting behavior resulted from the mixed polymorphs (i.e. the α and β forms) along with the melting-recrystallization-remelting of the β form crystals during the heating scans. The degree of melting-recrystallization-remelting phenomenon for each specimen was dependent primarily on how fast the sPS crystals were formed instead of the incorporation of aPSs. Furthermore, the existence of aPS in the blends, especially the lower molecular weight aPS, apparently reduced the possibility of forming the less stable α form in the sPS crystals.