A rare earth Schiff base complex:lanthanum tris(N-phenylethyl-3,5-di-t-butylsalicylaldiminato)s [La(OPEBS)_3] was successfully applied as single component initiator for the ring-opening polymerization of 1,4-dioxan-2-...A rare earth Schiff base complex:lanthanum tris(N-phenylethyl-3,5-di-t-butylsalicylaldiminato)s [La(OPEBS)_3] was successfully applied as single component initiator for the ring-opening polymerization of 1,4-dioxan-2-one (PDO) in bulk.The influence of reaction conditions,such as polymerization temperature,the molar ratio of the monomer to initiator (M/I) on the monomer conversion and molecular weight of the polymer has been investigated.Poly(1,4-dioxan-2-one) with a viscosity-average molecular weight (My) o...展开更多
The title compound [Cu（C11H29N5）]（ClO4）2 was synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction. The compound crystallizes in the monoclinic system, space group P21/n with...The title compound [Cu（C11H29N5）]（ClO4）2 was synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction. The compound crystallizes in the monoclinic system, space group P21/n with α = 9.405（2）, b = 14.495（3）, c = 14.715（3） A, β= 90.262（3）°, V=2006.1（7） A^3,M,=493.83,Z=4,F）（000）= 1028,Dc= 1.635 g/cm^3, T= 298（2） K,μ= 1.403 mm^-1 and = 0.71073 A. The was refined to R = 0.0508 and wR = 0. 1250 for 2293 observed reflections with I 〉 2σ（I）. The Cu（Ⅱ） atom possesses a five-coordtinate CuN5 environment which shows a slightly distorted square-pyramidal geonetry. Antimicrobial activity study found that the complex is active against Salmonella species, Staphylococcus aureu, Bacillus pumilus and Bacillus coliforms.展开更多
6-氯-2,′3,′5′-三-O-乙酰基鸟苷是一类有应用价值的核苷类药物中间体.本文以鸟苷为原料,经酰化、氯化合成6-氯-2,′3,′5′-三-O-乙酰基鸟苷.重点研究了酰化过程中溶剂选择、物料配比和反应温度对产品收率的影响.得出的较佳制备工艺...6-氯-2,′3,′5′-三-O-乙酰基鸟苷是一类有应用价值的核苷类药物中间体.本文以鸟苷为原料,经酰化、氯化合成6-氯-2,′3,′5′-三-O-乙酰基鸟苷.重点研究了酰化过程中溶剂选择、物料配比和反应温度对产品收率的影响.得出的较佳制备工艺为:8.5 g鸟苷(30 mmol)溶于10 mL吡啶和25 mL N,N-二甲基甲酰胺(DMF)混合溶剂中,加入18mL(0.3 mol)乙酸酐于80℃反应3 h;将所得产物溶于10 mL DMF和40 mL二氯乙烷混合溶剂中,加入8.3 g氯化四乙铵,滴加14 mL三氯氧磷于85℃微波反应10 m in,即得产品,总产率达75.2%.使用元素分析、核磁共振和质谱对所得产品进行分析,结果表明所得产品为目标产品.展开更多
基金supported by the National Natural Science Foundation of China (Key program,Nos.G20434020 and G20774078).
文摘A rare earth Schiff base complex:lanthanum tris(N-phenylethyl-3,5-di-t-butylsalicylaldiminato)s [La(OPEBS)_3] was successfully applied as single component initiator for the ring-opening polymerization of 1,4-dioxan-2-one (PDO) in bulk.The influence of reaction conditions,such as polymerization temperature,the molar ratio of the monomer to initiator (M/I) on the monomer conversion and molecular weight of the polymer has been investigated.Poly(1,4-dioxan-2-one) with a viscosity-average molecular weight (My) o...
基金The project was supported by the Natural Science Foundation of Jiangsu Province (No. BK2005045) and Key Marine Biotechnology Lab. of HHIT
文摘The title compound [Cu（C11H29N5）]（ClO4）2 was synthesized and characterized by elemental analysis, IR and X-ray single-crystal diffraction. The compound crystallizes in the monoclinic system, space group P21/n with α = 9.405（2）, b = 14.495（3）, c = 14.715（3） A, β= 90.262（3）°, V=2006.1（7） A^3,M,=493.83,Z=4,F）（000）= 1028,Dc= 1.635 g/cm^3, T= 298（2） K,μ= 1.403 mm^-1 and = 0.71073 A. The was refined to R = 0.0508 and wR = 0. 1250 for 2293 observed reflections with I 〉 2σ（I）. The Cu（Ⅱ） atom possesses a five-coordtinate CuN5 environment which shows a slightly distorted square-pyramidal geonetry. Antimicrobial activity study found that the complex is active against Salmonella species, Staphylococcus aureu, Bacillus pumilus and Bacillus coliforms.
文摘6-氯-2,′3,′5′-三-O-乙酰基鸟苷是一类有应用价值的核苷类药物中间体.本文以鸟苷为原料,经酰化、氯化合成6-氯-2,′3,′5′-三-O-乙酰基鸟苷.重点研究了酰化过程中溶剂选择、物料配比和反应温度对产品收率的影响.得出的较佳制备工艺为:8.5 g鸟苷(30 mmol)溶于10 mL吡啶和25 mL N,N-二甲基甲酰胺(DMF)混合溶剂中,加入18mL(0.3 mol)乙酸酐于80℃反应3 h;将所得产物溶于10 mL DMF和40 mL二氯乙烷混合溶剂中,加入8.3 g氯化四乙铵,滴加14 mL三氯氧磷于85℃微波反应10 m in,即得产品,总产率达75.2%.使用元素分析、核磁共振和质谱对所得产品进行分析,结果表明所得产品为目标产品.
