A commercially purchased acetoacetamide was found to dimerize during storage for several months to afford 4,6-dimethyl-2-pyridone-5-carboxamide. We successfully achieved the quantitative dimerization of acetoacetamide by using an acid catalyst. It was also found that the pyridone formed served as a self-catalyst of the dimerization.
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What controls the magnetic exchange interaction in mixed- and homo-valent Mn7 disc-like clusters? A theoretical perspective.
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IITB-Monash Research Academy, IIT Bombay, Mumbai, 400076 (India).
Density functional theory (DFT) studies have been undertaken to compute the magnetic exchange and to probe the origin of the magnetic interactions in two hetero- and two homo-valent heptanuclear manganese disc-like clusters, of formula [Mn(II) 4 Mn(IV) 3 (tea)(teaH2 )3 (peolH)4 ] (1), [Mn(II) 4 Mn(III) 3 F3 (tea)(teaH)(teaH2 )2 (piv)4 (Hpiv)(chp)3 ] (2), [Mn(II) 7 (pppd)6 (tea)(OH)3 ] (3) and [Mn(II) 7 (paa)6 (OMe)6 ] (4) (teaH3 =triethanolamine, peolH4 =pentaerythritol, Hpiv=pivalic acid, Hchp=6-chloro-2-hydroxypyridine, pppd=1-phenyl-3-(2-pyridyl) propane-1,3-dione; paaH=N-(2-pyridinyl)acetoacetamide). DFT calculations yield J values, which reproduce the magnetic susceptibility data very well for all four complexes; these studies are also highlighting the likely ageing/stability problems in two of the complexes. It is found that the spin ground states, S, for complexes 1-4 are drastically different, varying from S=29/2 to S=1/2.
View Article and Find Full Text PDFRevisiting dimerization of acetoacetamide leading to 4,6-dimethyl-2-pyridone-5-carboxamide.
J Oleo Sci
October 2015
School of Environmental Science and Engineering, Kochi University of Technology.
A commercially purchased acetoacetamide was found to dimerize during storage for several months to afford 4,6-dimethyl-2-pyridone-5-carboxamide. We successfully achieved the quantitative dimerization of acetoacetamide by using an acid catalyst. It was also found that the pyridone formed served as a self-catalyst of the dimerization.
View Article and Find Full Text PDFDimerization of acetoacetamide leading to 5-carbamoyl-4,6-dimethyl-2-pyridone.
J Oleo Sci
March 2008
Department of Chemistry, Osaka Kyoiku University, Kashiwara, Osaka, Japan.
The dimerization of acetoacetamide easily proceeds at room temperature in a dimethyl sulfoxide solution to afford 5-carbamoyl-4,6-dimethyl-2-pyridone.
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