(Z)-3-dodecen-1-yl(E)-2-butenoate was synthesized starting from acetylene. The key feature of this approach is use of ethylene diamine in the reaction of acetylene and sodium amide for synthesizing 1-decyne. This reac...(Z)-3-dodecen-1-yl(E)-2-butenoate was synthesized starting from acetylene. The key feature of this approach is use of ethylene diamine in the reaction of acetylene and sodium amide for synthesizing 1-decyne. This reaction allowed a convenient preparation of terminal alkyne with a long chain from cheap and common chemicals. The title sex pheromone synthesized showed highly attractant activity in the field to cylas formicarius fabricius.展开更多
以烯丙基氯和CO_(2)为原料、Cu-In复合材料为工作电极、Mg为牺牲阳极,在一室型电解池中常温常压恒电流下电解合成3-丁烯酸。其中,Cu-In复合材料采用电镀方法制备,并利用XRD、SEM和EDX表征。为提高目标产物3-丁烯酸的产率,本文分析了阴...以烯丙基氯和CO_(2)为原料、Cu-In复合材料为工作电极、Mg为牺牲阳极,在一室型电解池中常温常压恒电流下电解合成3-丁烯酸。其中,Cu-In复合材料采用电镀方法制备,并利用XRD、SEM和EDX表征。为提高目标产物3-丁烯酸的产率,本文分析了阴极材料电镀时间、溶剂、支持电解质、电流密度、通电量和温度等因素对烯丙基氯电羧化反应的影响。在25℃反应温度、90 min Cu-In复合材料电镀时间、MeCN溶剂、四乙基碘化铵(TEAI)支持盐、3.0 F/mol电解电量、8 mA·cm^(2)电流密度的优化条件下,3-丁烯酸的产率可达56%。此外,在优化条件下还考察了烯丙基溴、肉桂基氯、肉桂基溴、3-氯-2-甲基丙烯等烯丙基卤代物的电羧化反应,结果表明均可得到相应的羧酸,意味着Cu-In双金属电极对催化烯丙基卤代物电羧化反应具一定的普适性。展开更多
Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/...Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/20 to 20/80 by melt mixing method. Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), dynamic mechanical thermal analysis (DMA), polarizing optical microscopy (POM) and wide angle X-ray diffractometer (WAXD) were used to study the miscibility and crystallization behavior of PHBHHx/PBSA blends. Experimental results indicate that PHBHHx is immiscible with PBSA as shown by the almost unchanged glass transition temperature and the biphasic melt.展开更多
文摘(Z)-3-dodecen-1-yl(E)-2-butenoate was synthesized starting from acetylene. The key feature of this approach is use of ethylene diamine in the reaction of acetylene and sodium amide for synthesizing 1-decyne. This reaction allowed a convenient preparation of terminal alkyne with a long chain from cheap and common chemicals. The title sex pheromone synthesized showed highly attractant activity in the field to cylas formicarius fabricius.
文摘以烯丙基氯和CO_(2)为原料、Cu-In复合材料为工作电极、Mg为牺牲阳极,在一室型电解池中常温常压恒电流下电解合成3-丁烯酸。其中,Cu-In复合材料采用电镀方法制备,并利用XRD、SEM和EDX表征。为提高目标产物3-丁烯酸的产率,本文分析了阴极材料电镀时间、溶剂、支持电解质、电流密度、通电量和温度等因素对烯丙基氯电羧化反应的影响。在25℃反应温度、90 min Cu-In复合材料电镀时间、MeCN溶剂、四乙基碘化铵(TEAI)支持盐、3.0 F/mol电解电量、8 mA·cm^(2)电流密度的优化条件下,3-丁烯酸的产率可达56%。此外,在优化条件下还考察了烯丙基溴、肉桂基氯、肉桂基溴、3-氯-2-甲基丙烯等烯丙基卤代物的电羧化反应,结果表明均可得到相应的羧酸,意味着Cu-In双金属电极对催化烯丙基卤代物电羧化反应具一定的普适性。
基金The National Natural Science Foundation of China (No. 20374032) and Tianjin Science and Technology Key Project (No. 05YFSZSF02200)
文摘Blends of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) and poly(butylene succinate-adipate) (PBSA), both biodegradable semicrystalline polyesters, were prepared with the ratio of PHBHHx/PBSA ranging from 80/20 to 20/80 by melt mixing method. Differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), dynamic mechanical thermal analysis (DMA), polarizing optical microscopy (POM) and wide angle X-ray diffractometer (WAXD) were used to study the miscibility and crystallization behavior of PHBHHx/PBSA blends. Experimental results indicate that PHBHHx is immiscible with PBSA as shown by the almost unchanged glass transition temperature and the biphasic melt.
