623-49-4Relevant articles and documents
Synthesis of glycidyl-5-(carboxyethyl-1H-tetrazole)polymer and 1,2-bis(5-carboxyethyl-1H-tetrazolyl)ethane as polymeric precursor
Betzler, Franziska M.,Klapoetke, Thomas M.,Sproll, Stefan M.
, p. 509 - 514 (2013)
The synthesis of the nitrogen-rich glycidyl-5-(carboxyethyl-1H-tetrazole) polymer (4) by the reaction of glycidyl azide polymer (GAP) and ethyl cyanoformate (2) is described. Moreover, the polymer precursor 1,2-bis(5-carboxyethyl-1H-tetrazolyl)ethane (3), containing two tetrazole moieties, was obtained by reacting compound 2 and 1,2-diazidoethane (1). The substances were characterized by using vibrational spectroscopy (IR), mass spectrometry, as well as multinuclear NMR spectroscopy. Compound 3 was additionally characterized by single-crystal X-ray diffraction measurements. The thermal stability of 3 was determined by differential scanning calorimetry, which reveals that this compound is a highly stable molecule. Synthesis of highly thermally stable energetic nitrogen-rich polymers incorporating tetrazole heterocycles and the corresponding polymer precursor is reported. Complete structural and spectroscopic characterization including IR and multinuclear NMR spectroscopy and mass spectrometry, as well as single-crystal X-ray diffraction analysis of 1,2-bis(5-carboxyethyl-1H-tetrazolyl)ethane, was accomplished. Copyright
Detrifluoroacetylation of 4,4,4-trifluoro-3,3-dihydroxy-2-(hydroxyimino)butan-1-ones as a convenient synthetic strategy for acyl cyanides Dedicated to Academician Valery N. Charushin on his 65th birthday.
Bazhin, Denis N.,Kudyakova, Yulia S.,Nemytova, Natalia A.,Burgart, Yanina V.,Saloutin, Victor I.
, p. 28 - 32 (2016/05/02)
A reaction reinvestigation of fluorinated 1,3-dicarbonyl compounds with NaNO2 in acidic conditions revealed the formation of corresponding 1,1,1-trifluoro-3-hydroxyimino-butan-2,4-diones which predominantly isolated as hydrates. A novel synthesis of ethoxy-, alkyl-, (het)aryl substituted carbonylcyanides via acid-catalyzed detrifluoroacetylation of obtained 2-hydroxyimino derivatives of 1,3-dicarbonyl compounds was described.
Theoretical, structural, vibrational, NMR, and thermal evidence of the inter- versus intramolecular hydrogen bonding in oxamides and thiooxamides
Desseyn,Perlepes,Clou,Blaton,Van Der Veken,Dommisse,Hansen
, p. 5175 - 5182 (2007/10/03)
This contribution describes the study of hydrogen bonding in secondary oxamides, monothiooxamides, and dithiooxamides by ab initio calculations, X-ray diffractions, NMR spectra, thermal analysis, and variable-temperature infrared and Raman spectroscopy. The results can all be interpreted as a function of the change in the strength and the nature of the hydrogen bonding by substituting oxygen for sulfur in the series CH3-HNCOCONHCH3, CH 3HNCSCONHCH3, CH3HNCSCSNHCH3 and by changing the steric influence of the alkyl group in a series of oxamides (RHNCOCNHR; R = CH3, C2H5, iC3H 7, tC49).