Electrocarboxylation of anthrone in the presence of CO2 to anthrance-9-carboxylic acid directly was carried out. The electroreduction behavior of anthrone was examined by cyclic voltammetry in the absence and presence...Electrocarboxylation of anthrone in the presence of CO2 to anthrance-9-carboxylic acid directly was carried out. The electroreduction behavior of anthrone was examined by cyclic voltammetry in the absence and presence of CO2. Then the influences of the supporting electrolytes, temperature, electrode material and anthrone concentration on the carboxylation yield were investigated. Under the optimized conditions, anthrancene-9-carboxylic acid was obtained in a good yield（96.1%）.展开更多
The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 1...The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 15.549(4) ? b = 106.52(3), V = 1738.1(8) 3, Z = 4, Dc = 1.308 g/cm3, m = 0.086 mm-1 and F(000) = 720. The final R = 0.0331 and wR = 0.0850. The results show that the two phenyl rings of the anthrone fragment are not coplanar, but with a dihedral angle of 157.92. The middle ring of the anthrone moiety appears asymmetric boat conformation, while the 2,5-dimethoxyphenyl ring is restricted rotation. Therefore they exist in two optically active forms which are symmetrical glidingly.展开更多
A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by...A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by spectral evidences, especially by 2 D techniques.展开更多
Sulfuric acid-phenol and sulfuric acid-anthrone methods were used to detect polysaccharide content in shoots of Aralia elata（ Miq.） Seem.,and the conversion factor to glucose was measured with refined polysaccharide...Sulfuric acid-phenol and sulfuric acid-anthrone methods were used to detect polysaccharide content in shoots of Aralia elata（ Miq.） Seem.,and the conversion factor to glucose was measured with refined polysaccharides. Comprehensive evaluation was carried out by linear relationship,precision,reproducibility,stability and recovery rate. The results showed that the linear relationship between glucose concentration and absorbance was good when glucose concentration was0-40 μg/ml,and the average recovery rate was equal to or higher than 97. 00% with good reproducibility（ RSD 〈 1. 60%,n = 5）. It revealed that the two methods were accurate and reliable,and suitable for the determination of polysaccharide content in the shoots of A. elata. Polysaccharide content detected by sulfuric acid-phenol and sulfuric acid-anthrone methods was 19. 31% and 20. 40% respectively.展开更多
基金Supported by the National Natural Science Foundation of China(No.20973065)the"Chen Guang"Project Supported by Shanghai Municipal Education Commission and Shanghai Education Development Foundation,China(No.10CG26)+1 种基金the Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20100076120020)the Foundation of Outstanding Yong Talent in University of Anhui Province,China(No.2010SQRL042)
文摘Electrocarboxylation of anthrone in the presence of CO2 to anthrance-9-carboxylic acid directly was carried out. The electroreduction behavior of anthrone was examined by cyclic voltammetry in the absence and presence of CO2. Then the influences of the supporting electrolytes, temperature, electrode material and anthrone concentration on the carboxylation yield were investigated. Under the optimized conditions, anthrancene-9-carboxylic acid was obtained in a good yield（96.1%）.
基金Project supported by the Zhejiang Natural Science Foundation (No. 200016)
文摘The anthrone reacts with 2,5-dimethoxybenzaldehyde under base catalyst to afford the title compound (C23H18O3, Mr = 342.37). The crystal belongs to monoclinic, space group P21/c with a = 13.046(4), b = 8.937(2), c = 15.549(4) ? b = 106.52(3), V = 1738.1(8) 3, Z = 4, Dc = 1.308 g/cm3, m = 0.086 mm-1 and F(000) = 720. The final R = 0.0331 and wR = 0.0850. The results show that the two phenyl rings of the anthrone fragment are not coplanar, but with a dihedral angle of 157.92. The middle ring of the anthrone moiety appears asymmetric boat conformation, while the 2,5-dimethoxyphenyl ring is restricted rotation. Therefore they exist in two optically active forms which are symmetrical glidingly.
文摘A new 10-hydroxyl anthrone glycoside, 1, 8, 10 - trihydroxyl-1ObDglucopyrano- syl-3-methyl-10- C (S) b D- glucopyranosyl-anthrone-9 1 was isolated from the stem of Cassia siamea Lam. The structure was elucidated by spectral evidences, especially by 2 D techniques.
基金Supported by Scientific Research Project of Education Department of Liaoning Province,China(L2017lkyfwdf-05)Public Welfare Fund Project of Department of Science and Technology of Liaoning Province,China(2016003003)
文摘Sulfuric acid-phenol and sulfuric acid-anthrone methods were used to detect polysaccharide content in shoots of Aralia elata（ Miq.） Seem.,and the conversion factor to glucose was measured with refined polysaccharides. Comprehensive evaluation was carried out by linear relationship,precision,reproducibility,stability and recovery rate. The results showed that the linear relationship between glucose concentration and absorbance was good when glucose concentration was0-40 μg/ml,and the average recovery rate was equal to or higher than 97. 00% with good reproducibility（ RSD 〈 1. 60%,n = 5）. It revealed that the two methods were accurate and reliable,and suitable for the determination of polysaccharide content in the shoots of A. elata. Polysaccharide content detected by sulfuric acid-phenol and sulfuric acid-anthrone methods was 19. 31% and 20. 40% respectively.
