Structural effects and hydrogen bonds on N,N′-di(methoxycarbonylsulfenyl)urea, [CH3OC(O)SNH]2CO, studied by experimental and theoretical methods
摘要:
Pure N,N'-di(methoxycarbonylsulfenyl)urea, [CH3OC(O)SNH](2)CO, is quantitatively prepared by the hydrolysis reaction of CH3OC(O)SNCO and characterized by H-1 NMR, GC-MS and FTIR spectroscopy techniques. Structural and conformational properties are analyzed using a combined approach with data obtained from X-ray diffraction, vibrational spectra and theoretical calculation methods. The IR and Raman spectra for normal and deuterated species are reported. The crystal structure of [CH3OC(O)SNH](2)CO was determined by X-ray diffraction methods. The substance crystallizes in the orthorhombic P2(1)2(1)2 space group with a = 9.524(2), b = 12.003(1), c = 4.481 (1) angstrom, and Z = 2 moieties in the unit cell. The molecule is sited on a twofold crystallographic axis (C-2) parallel to c and shows the anti-anti conformation (S-N single bonds antiperiplanar with respect to the opposite C-N single bonds in sulfenyl-urea-sic group). Neighboring molecules are arranged in a chain motif that extends along the C-2-axis and is held by bifurcated NH center dot center dot center dot O center dot center dot center dot HN intermolecular bonds. A local planar symmetry is observed in the crystal for the central -SN(H)C(O)N(H)S- skeleton. Experimental and calculated data allow to trace this structural feature to the occurrence of N-H center dot center dot center dot O=C hydrogen bonding interactions. Calculated vibrational and structural properties are in good agreement with the experimentally determined features. (C) 2008 Elsevier B.V. All rights reserved.
Convenient synthesis of carbamates, S-alkyl thiocarbamates, and N,N′-disubstituted urea derivatives of methoxycarbonylsulfenyl isocyanate
作者:Sonia Torrico-Vallejos、Mauricio F. Erben、Evamarie Hey-Hawkins、Carlos O. Della Védova
DOI:10.1016/j.tetlet.2011.08.027
日期:2011.10
methods for the synthesis of carbamates, N,N′-unsymmetrically disubstituted ureas, and S-alkyl thiocarbamates derived from CH3OC(O)SNCO in one-step are provided. Reactions are operationally simple and have high selectivity toward nitrogen, oxygen, and sulfur nucleophiles. The absence of solvents coupled with high yields and short reaction times make these procedures very attractive for synthesis.
Crystal structure and spectroscopic properties of N′-methoxycarbonylsulfenyl-substituted ureas, CH3OC(O)SN(H)C(O)NRR′ [R=H, R′=C(CH3)3 and R=R′=CH2CH3]
作者:Sonia Torrico-Vallejos、Mauricio F. Erben、Santiago Gómez Ruiz、Evamarie Hey-Hawkins、Gustavo A. Echeverría、Oscar E. Piro、Carlos O. Della Védova
DOI:10.1016/j.molstruc.2012.12.047
日期:2013.4
Structural and spectroscopic properties of N,N-diethyl- (I) and N-tert-butyl-N'-methoxycarbonylsulfenyl urea (II) are analyzed using a combined approach with data obtained from X-ray diffraction, vibrational spectra and quantum chemical calculations. The molecular structures of CH3OC(O)SN(H)C(O)N(CH2CH3)(2) (I) and CH3OC(O)SN(H)C(O)N(H)C(CH3)(3) (II), the later co-crystallized with ethyl acetate (II 1/2EtOAc), were determined by X-ray diffraction methods. Compound I crystallizes in the triclinic space group P-1 and II.0.5EtOAc in the orthorhombic space group Pnma. In I, there are two independent but closely related molecules in the asymmetric unit whose conformations differ only in the orientation of the terminal N(CH2CH3)(2) groups. Neighboring molecules in I exhibit N-H center dot center dot center dot O interaction giving rise to a polymeric chains. The conformation of the O-C=O-S-N-C=O-N skeleton of II is almost identical to the corresponding one of both molecules of I. Neighboring molecules in II are linked through bifurcated N-H center dot center dot center dot O center dot center dot center dot H-N interactions giving rise to a polymeric chain. The vibrational properties have been studied by FTIR and FT-Raman spectroscopy along with quantum chemical calculations at the B3LYP/6-311+G* level. (C) 2013 Published by Elsevier B.V.