636-79-3Relevant articles and documents
Multitechnique experimental insight on an unusual crystal-to-crystal high temperature solid state reaction in zirconium carboxypyridinephosphonates: From one-dimensional chains to two-dimensional hybrid layers through HF elimination
Costantino, Ferdinando,Sassi, Paola,Geppi, Marco,Taddei, Marco
, p. 5462 - 5470 (2012)
Two novel N-phosphonoethylcarboxypyridines were prepared via nucleophilic substitution of two carboxypyridines (namely, 4-carboxypyridine, or isonicotinic acid, and 3-carboxypyridine, or nicotinic acid) with diethyl-2- bromoethylphosphonate in water. Two zirconium derivatives of these acids were obtained under mild solvothermal conditions, and their structures were solved from powder X-ray diffraction (PXRD) data. The zirconium derivative containing the isonicotinic moiety (1), with formula ZrF2(HF)(O 3PCH2CH2NC5H4CO 2), has a one-dimensional (1D) chain structure in which the carboxypyridine groups are placed in the external part of the inorganic chain constituted of zirconium octahedra and phosphonic tetrahedra, whereas the zirconium derivative containing the nicotinic moiety (2), with formula ZrF 2(O3PCH2CH2NC5H 4CO2), has a hybrid layered structure in which zirconium octhaedra and phosphorus tetrahedra form a new structural archetype, with a C-O group coordinating the zirconium atoms. 1 underwent a high temperature (280 °C) slow solid state transformation that involved the loss of one HF molecule coordinated to the zirconium atom and the replacement of this coordination vacancy with the neighboring C-O- group belonging to the adjacent chain. The structure of this heated compound (1a) is a polymorph of 2. A multitechnique approach, based on coupled Fourier transform infrared spectroscopy and Raman and solid state NMR spectroscopy allowed us to carry out a thorough characterization of these materials, finding nice agreements on the chemical details of this solid state reaction.
KetoABNO/NOx Cocatalytic Aerobic Oxidation of Aldehydes to Carboxylic Acids and Access to α-Chiral Carboxylic Acids via Sequential Asymmetric Hydroformylation/Oxidation
Miles, Kelsey C.,Abrams, M. Leigh,Landis, Clark R.,Stahl, Shannon S.
supporting information, p. 3590 - 3593 (2016/08/16)
A method for aerobic oxidation of aldehydes to carboxylic acids has been developed using organic nitroxyl and NOx cocatalysts. KetoABNO (9-azabicyclo[3.3.1]nonan-3-one N-oxyl) and NaNO2 were identified as the optimal nitroxyl and NOx sources, respectively. The mildness of the reaction conditions enables sequential asymmetric hydroformylation of alkenes/aerobic aldehyde oxidation to access α-chiral carboxylic acids without racemization. The scope, utility, and limitations of the oxidation method are further evaluated with a series of achiral aldehydes bearing diverse functional groups.
On the Synthesis of 8-Amino-5-aza-1,3-nonamdiene Derivatives
Streith, Jacques,Tschamber, Theophile,Wolff, Gerard
, p. 1374 - 1392 (2007/10/02)
Starting from glycine derivatives and the diazepines 1, 8-succinimido-5-aza-1,3-nonamdienes 5 and 8-phthalimido-5-aza-1,3-nonamdienes 8 are synthesized stereospecifically in trans configuration.Cleavage of the side-chain leads in particular to the unstabl
METABOLIC PRODUCTS OF ASPERGILLUS TERREUS. VI. METABOLITES OF THE STRAIN IFO 8835. (3). THE ISOLATION AND CHEMICAL STRUCTURES OF COLORLESS METABOLITES
Arai, Kunizo,Shimizu, Sakae,Yamamoto, Yuzuru
, p. 1005 - 1012 (2007/10/02)
Seven colorless metabolites related to asterriquinones and one colorless compound of another type were isolated from Aspergillus terreus IFO 8835, and their chemical structures were determined.Keywords-asterriquinones, Aspergillus terreus; IFO 8835; indolyl; indoline; nicotinyl
