含有苯并(噁)唑及吡啶基团的双杂芳基乙炔的合成

标题化合物通过双杂芳基乙烯在加热回流的二氯甲烷中加溴,然后室温下在四氢呋喃溶液中由叔丁醇钾脱溴的方法进行制备,合成了8种未见文献报道的标题化合物.与过渡金属催化方法相比,此种制备方法原料易得,反应简便高效,不需要有昂贵金属参与.对所得产物进行了紫外和荧光光谱的检测,光化学测试表明,在紫外光照射下,标题化合物在有机溶剂或酸性水溶液中没有光化学活性.     

废旧聚苯乙烯溴化反应的影响因素研究

以溴化聚苯乙烯(BPS)含溴率为指标,研究了催化剂种类及用量、溴化剂、脱水剂、反应温度、反应时间等因素对废旧聚苯乙烯(PS)溴化反应的影响;利用红外光谱、DSC分析仪对BPS的结构和性能进行了表征.结果表明:AlCl3作为主催化剂较好,AlCl3、助催化剂Al、单质溴的较佳用量分别为废旧聚苯乙烯质量的4.3%、0.5%、3.8%,脱水剂(P2O5)的较佳用量为二氯乙烷质量的0.2%;较佳反应温度为40℃,反应时间为5h.     

Design and Application of 2,2‐Dibromodimedone as Organic Brominating Reagent for Asymmetric Bromination of 1,3‐Dicarbonyl Compounds and Ketones Catalysed by Chiral Amino Acids

A green and ecofriendly enantioselective α‐bromination of carbonyl and 1,3‐dicarbonyl compounds is reported involving the synthesis of a novel organic brominating source. The organic brominating reagent can be recovered after each cycle, rebrominated and reused. The reaction is catalysed by chiral amino acids and completed within a short reaction time with good enantioselectivity and exclusive formation of only α‐monobrominated carbonyl compounds.     

New route for bromination of multiwalled carbon nanotubes under mild and efficient conditions

A short study on bromination of multiwalled carbon nanotubes (MWCNTs) through new and convenient methods was reported. Bromine (Br) is chemically attached on MWCNTs surfaces through electrophilic addition and radical reactions using N-Bromosuccinimide (NBS), NH₄NO₃/NBS and Br₂ under thermal and UV conditions. Functionalized CNTs with Bromine groups, were characterized by Fourier transform infrared spectroscopy (FTIR), thermo gravimetric analysis (TGA), scanning electron microscopy and X-ray diffraction (XRD) methods.     

用改进的Sollott法合成1,3,5,7-四硝基金刚烷

以金刚烷为原料经过溴化、卤素交换碘化、酰胺化、水解和氧化5步反应合成1,3,5,7-四硝基金刚烷(TNA).其中,第三步自由基酰胺化反应用偶氮二异丁腈(AIBN)在常规玻璃仪器中进行化学引发,代替了 Sollott法中用石英反应瓶和特殊的Ryaonet光化学反应器的光照引发.结果表明,该方法的反应时间从64h缩短到30...     

4-溴-1-甲基-3(5)-三氟甲基吡唑的合成方法研究

设计合成4-溴-1-甲基-3(5)-三氟甲基吡唑的不同方法,以寻求优化合成条件。实验结果表明,新设计的一些合成路线,较以前报道的工艺收率高、产品质量好、设备要求低。     

离子液体中合成2-溴-4-甲氧基苯胺的研究

研究了在离子液体中对甲氧基苯胺经溴化合成2-溴-4-甲氧基苯胺的方法.以98.2％的收率得到质量分数为99.5％的2-溴-4-甲氧基苯胺.探讨了不同溴化剂及其用量、反应温度、反应时间等因素对溴化反应的影响.该方法原料易得,反应条件易于控制,收率高,离子液体可以重复使用,对环境友好.     

微通道反应器内叔丁醇溴化反应工艺研究

研究了微通道反应器中叔丁醇的溴化反应制备溴代叔丁烷的工艺过程,考察了原料摩尔配比、反应温度、催化剂浓硫酸的用量、停留时间等单因素对反应的影响。通过实验结果得到了较佳的工艺条件:反应温度为50℃,叔丁醇、氢溴酸和浓硫酸的摩尔比为1∶1.5∶1,停留时间60s,叔丁醇的转化率为92.3%,溴代叔丁烷的选择性为99.1%,传统间歇搅拌反应器中叔丁醇转化率为88.3%,溴代叔丁烷选择性为86.5%。相较于传统工艺方法,利用微通道技术提高了反应效果,降低了反应条件的要求,减少了废酸的产生,大大提高了生产效率。     

Regioselective bromination of toluene by electrochemical method

A simple, regioselective, environmentally cleaner and economical method for the electrochemical preparation of benzyl bromide from toluene by two-phase electrolysis is reported. Electrochemical bromination of toluene is carried out in an undivided cell at 0 °C and the process parameters are studied and optimized. In this method 94% yield and 98% conversion is achieved.