We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaC1, H2SiO3, and NaCl＋H2SiO3 treatments. Results show that 0.3 g/kg NaC1, 0.2 g/kg HzSiO3 or 0.3 g/kg NaC...We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaC1, H2SiO3, and NaCl＋H2SiO3 treatments. Results show that 0.3 g/kg NaC1, 0.2 g/kg HzSiO3 or 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatments can effectively promote growth and improve the drought resistance of/-L, ammodendron. Compared with that without NaCI treatment, H. ammodendron＇s height, crown diameter and fresh weight increased by 42%, 91% and 62% respectively under 0.3 g/kg NaC1 treatment, and its main stem diameter, main root diameter and main root length increased by 40%, 39% and 23%, respectively. Compared with that without H2SiO3 treatments, H. ammodendron＇s height, crown diameter and flesh weight increased by 36%, 45% and 27% respectively under 0.2 g/kg HeSiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 23%, 23% and 20%, respectively. Compared with that under 0.3 g/kg NaC1 treatment, H. ammodendron＇s height, crown diameter and fresh weight and main root length increased by 9%, 10%, 17% and 12% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment. Compared with that under 0.1 g/kg H2SiO3 treatment, H. ammodendron＇s height, crown diame- ter and fresh weight increased by 28%, 76% and 68% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 30%, 32% and 27%, respectively. This suggests that moder- ate levels of NaCI＋H2SiO3 interaction can effectively promote growth and improve drought resistance of/-L, ammodendron than separate applications of NaC1 or H2SiO3.展开更多
A nanosolid heteropoly acid of H 3PW 12 O 40 /SiO 2 was prepared with the sol-gel method and used to catalyze sythesis of methyl 5-amino-1,2,4,-trazolylformate sulfate.The structure of the nanosolid heteropoly acid H ...A nanosolid heteropoly acid of H 3PW 12 O 40 /SiO 2 was prepared with the sol-gel method and used to catalyze sythesis of methyl 5-amino-1,2,4,-trazolylformate sulfate.The structure of the nanosolid heteropoly acid H 3PW 12 O 40 /SiO 2 was characterized by IR,XRD and TEM.The following optimum condition were that the mole ratio of alcohol to carboxylic acid is 27∶1,the temperature is 75℃,the reaction time is 5 hours,and the catalyst is 2 5% of feedstock.Under the optimum conditions,the yield of esters was above 94%.展开更多
目的合成4-苯基-6-甲基-5-乙氧羰基-3,4-二氢嘧啶-2(H)-酮。方法采用一锅法Biginelli反应以乙酰乙酸乙酯、苯甲醛和尿素为原料,H3PW12O40/SiO2为催化剂,无水乙醇为溶剂进行合成目标化合物。通过熔点,IR,1 H NMR和MS等测试手段对合成的...目的合成4-苯基-6-甲基-5-乙氧羰基-3,4-二氢嘧啶-2(H)-酮。方法采用一锅法Biginelli反应以乙酰乙酸乙酯、苯甲醛和尿素为原料,H3PW12O40/SiO2为催化剂,无水乙醇为溶剂进行合成目标化合物。通过熔点,IR,1 H NMR和MS等测试手段对合成的目标化合物进行表征。结果探讨了反应温度、催化剂用量、反应时间和反应物的摩尔比对收率的影响。实验表明:固定苯甲醛用量为0.04mol的条件下,催化剂的用量占反应物料总质量的2.0%,n(苯甲醛)∶n(乙酰乙酸乙酯)∶n(尿素)=1∶1.5∶1.5,反应时间为90min,反应温度为90℃。在优化条件下,产品平均收率可达79.2%。结论溶胶凝胶法制备的H3PW12O40/SiO2是合成4-苯基-6-甲基-5-乙氧羰基-3,4-二氢嘧啶-2(H)-酮的良好催化剂,具有催化剂用量少,催化活性高,可回收重复使用等特点。展开更多
A highly efficient one-pot synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions catalyzed by sulfonic acid covalently anchored onto the surface of silica gel is reported. All types of aldehydes, incl...A highly efficient one-pot synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions catalyzed by sulfonic acid covalently anchored onto the surface of silica gel is reported. All types of aldehydes, including aromatic, unsaturated, and heterocyclic, are used. The silica gel/sulfonic acid catalyst （SiO2-R-SO3H） is completely heterogeneous and can be recycled.展开更多
基金supported by the National Agricultural Sci-Tech Transformation Foundation of China (Grant No. 2009GB23600512)the National Natural Science Foundation of China (Grant No. 30770347)the National Scientific Research Special Funds of Public Service Sectors of Forestry of China (Grant No. 201004045)
文摘We studied pot cultivated Haloxylon ammodendron＇s growth, physiological changes and drought resistance under NaC1, H2SiO3, and NaCl＋H2SiO3 treatments. Results show that 0.3 g/kg NaC1, 0.2 g/kg HzSiO3 or 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatments can effectively promote growth and improve the drought resistance of/-L, ammodendron. Compared with that without NaCI treatment, H. ammodendron＇s height, crown diameter and fresh weight increased by 42%, 91% and 62% respectively under 0.3 g/kg NaC1 treatment, and its main stem diameter, main root diameter and main root length increased by 40%, 39% and 23%, respectively. Compared with that without H2SiO3 treatments, H. ammodendron＇s height, crown diameter and flesh weight increased by 36%, 45% and 27% respectively under 0.2 g/kg HeSiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 23%, 23% and 20%, respectively. Compared with that under 0.3 g/kg NaC1 treatment, H. ammodendron＇s height, crown diameter and fresh weight and main root length increased by 9%, 10%, 17% and 12% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment. Compared with that under 0.1 g/kg H2SiO3 treatment, H. ammodendron＇s height, crown diame- ter and fresh weight increased by 28%, 76% and 68% respectively under 0.3 g/kg NaCI＋0.1 g/kg H2SiO3 treatment, and its main stem diameter, main root diameter and main root length increased by 30%, 32% and 27%, respectively. This suggests that moder- ate levels of NaCI＋H2SiO3 interaction can effectively promote growth and improve drought resistance of/-L, ammodendron than separate applications of NaC1 or H2SiO3.
文摘A nanosolid heteropoly acid of H 3PW 12 O 40 /SiO 2 was prepared with the sol-gel method and used to catalyze sythesis of methyl 5-amino-1,2,4,-trazolylformate sulfate.The structure of the nanosolid heteropoly acid H 3PW 12 O 40 /SiO 2 was characterized by IR,XRD and TEM.The following optimum condition were that the mole ratio of alcohol to carboxylic acid is 27∶1,the temperature is 75℃,the reaction time is 5 hours,and the catalyst is 2 5% of feedstock.Under the optimum conditions,the yield of esters was above 94%.
文摘目的合成4-苯基-6-甲基-5-乙氧羰基-3,4-二氢嘧啶-2(H)-酮。方法采用一锅法Biginelli反应以乙酰乙酸乙酯、苯甲醛和尿素为原料,H3PW12O40/SiO2为催化剂,无水乙醇为溶剂进行合成目标化合物。通过熔点,IR,1 H NMR和MS等测试手段对合成的目标化合物进行表征。结果探讨了反应温度、催化剂用量、反应时间和反应物的摩尔比对收率的影响。实验表明:固定苯甲醛用量为0.04mol的条件下,催化剂的用量占反应物料总质量的2.0%,n(苯甲醛)∶n(乙酰乙酸乙酯)∶n(尿素)=1∶1.5∶1.5,反应时间为90min,反应温度为90℃。在优化条件下,产品平均收率可达79.2%。结论溶胶凝胶法制备的H3PW12O40/SiO2是合成4-苯基-6-甲基-5-乙氧羰基-3,4-二氢嘧啶-2(H)-酮的良好催化剂,具有催化剂用量少,催化活性高,可回收重复使用等特点。
文摘A highly efficient one-pot synthesis of 1,8-dioxooctahydroxanthenes under solvent-free conditions catalyzed by sulfonic acid covalently anchored onto the surface of silica gel is reported. All types of aldehydes, including aromatic, unsaturated, and heterocyclic, are used. The silica gel/sulfonic acid catalyst （SiO2-R-SO3H） is completely heterogeneous and can be recycled.
