Determination of the Apparent Molar Refraction and Partial Molar Volume at Infinite Dilution of Thiophene-, Pyrrole- and Furan-2-Carboxaldehyde Phenylhydrazone Derivatives in Acetonitrile at 293.15 K
摘要:
在 293.15 K 的温度下,对噻吩-2-(TCPH)、吡咯-2-(PCPH)和呋喃-2-甲醛苯腙(FCPH)化合物在乙腈中的极稀释溶液进行了高精度密度测量和高精度折射测量。根据 Kohner-Geffcken-Grunwald-Haley 近似法,实验测定了这些溶质在 293.15 K 时无限稀释时的表观摩尔折射率。根据杂原子的鲍林电负性和固有摩尔体积以及杂环的芳香性解释了体积测定法和折射测定法的结果。实验结果表明,在所研究的浓度范围内,溶质与溶质之间的相互作用可以忽略不计。DFT-B3LYP/6-311++G(3d,3p) 级别的分子体积理论计算支持这样的解释,即溶质-溶剂相互作用对溶质极限部分摩尔体积的体积贡献非常小,因此溶质分子在这种介质中是孤立的。
One-pot synthesis of 5-sulfonamidopyrazole from terminal alkynes, sulfonyl azides and hydrozones
作者:Yao Li、Deng Hong、Yuanxun Zhu、Ping Lu、Yanguang Wang
DOI:10.1016/j.tet.2011.08.067
日期:2011.10
5-Sulfonamidopyrazoles were efficiently synthesized from terminal alkynes, sulfonylazides and hydrozones. The sequential reaction involves a copper-catalyzed three-component reaction, a Lewis acid-catalyzed electrocyclic reaction and a dehydrogenation.
Synthesis, characterization and evaluation of the substituent effect on the amoebicide activity of new hydrazone derivatives
作者:Yanis Toledano-Magaña、Ruth Meléndrez-Luévano、Marisol Navarro-Olivarria、Juan Carlos García-Ramos、Marcos Flores-Alamo、Luis Ortiz-Frade、Lena Ruiz-Azuara、Blanca M. Cabrera-Vivas
DOI:10.1039/c4md00075g
日期:——
The electronic environment reflected in redox potential values of the hydrazone linkage and the nitro group plays a fundamental role in the amoebicidal activity.
氢酮缀合物和硝基基团的氧化还原电位值反映的电子环境,在阿米巴杀灭活性中发挥着基础作用。
Determination of the Apparent Molar Refraction and Partial Molar Volume at Infinite Dilution of Thiophene-, Pyrrole- and Furan-2-Carboxaldehyde Phenylhydrazone Derivatives in Acetonitrile at 293.15 K
作者:Ysaías J. Alvarado、José Caldera-Luzardo、Gladys Ferrer-Amado、Victoria Mancilla-Labarca、Elba Michelena
DOI:10.1007/s10953-006-9093-2
日期:2007.1.5
High-precision densitometry and high-accuracy refractometry measurements of extremely dilute solutions of the thiophene-2- (TCPH), pyrrole-2- (PCPH) and furan-2-carboxaldehyde-phenylhydrazone (FCPH) compounds in acetonitrile have been obtained at 293.15 K. The partial molar volumes V 2^∞ of each compound at infinite dilution were determined. The apparent molar refraction of these solutes at infinite dilution at 293.15 K has been experimentally determined within the Kohner-Geffcken-Grunwald-Haley approximation. The volumetric and refractometric results were interpreted in terms of the Pauling electronegativity and intrinsic molar volume of the heteroatom, and the aromaticity of the heterocyclic rings. The experimental results indicate that solute-solute interactions are negligible within the concentration range studied. Theoretical calculations at the DFT-B3LYP/6−311++G(3d,3p) level of molecular volumes support the interpretation that the volumetric contribution from the solute-solvent interactions to the limiting partial molar volumes of solutes are very small and thus solute molecules are isolated in this medium.
在 293.15 K 的温度下,对噻吩-2-(TCPH)、吡咯-2-(PCPH)和呋喃-2-甲醛苯腙(FCPH)化合物在乙腈中的极稀释溶液进行了高精度密度测量和高精度折射测量。根据 Kohner-Geffcken-Grunwald-Haley 近似法,实验测定了这些溶质在 293.15 K 时无限稀释时的表观摩尔折射率。根据杂原子的鲍林电负性和固有摩尔体积以及杂环的芳香性解释了体积测定法和折射测定法的结果。实验结果表明,在所研究的浓度范围内,溶质与溶质之间的相互作用可以忽略不计。DFT-B3LYP/6-311++G(3d,3p) 级别的分子体积理论计算支持这样的解释,即溶质-溶剂相互作用对溶质极限部分摩尔体积的体积贡献非常小,因此溶质分子在这种介质中是孤立的。
Base‐Mediated Generation of Ketenimines from Ynamides: Addition of Hydrazones to Give Acetimidohydrazides**
作者:Capucine Mahe、Agathe C. A. D'Hollander、Kevin Cariou
DOI:10.1002/ejoc.202200028
日期:2022.5.13
The addition of hydrazones onto the central carbon of the ketenimines generated in situ from N-Boc ynamides is reported. This reaction takes place under basic conditions and heating, to generate the N-arylketenimines, and gives access to a variety of acetimidohydrazides.
Non-toxic corrosion-protection pigments based on manganese
申请人:——
公开号:US20040011252A1
公开(公告)日:2004-01-22
Corrosion-inhibiting pigments based on manganese are described that contain a trivalent or tetravalent manganese/valence stabilizer complex. An inorganic or organic material is used to stabilize the trivalent or tetravalent manganese ion to form a compound that is sparingly soluble, exhibits low solubility, or is insoluble in water, depending upon the intended usage. Specific stabilizers are chosen to control the release rate of trivalent or tetravalent manganese during exposure to water and to tailor the compatibility of the powder when used as a pigment in a chosen binder system. Stabilizers may also modify the processing and handling characteristics of the formed powders. Manganese/valence stabilizer combinations are chosen based on the well-founded principles of manganese coordination chemistry. Many manganese-valence stabilizer combinations are presented that can equal the performance of conventional hexavalent chromium or tetravalent lead systems. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.