CEQUINOR   05415
CENTRO DE QUIMICA INORGANICA "DR. PEDRO J. AYMONINO"
Unidad Ejecutora - UE
artículos
Título:
Preparation and Properties of Methoxycarbonylsulfenyl Isocyanate, CH3OC(O)SNCO
Autor/es:
TORRICO VALLEJOS, SONIA; ERBEN, MAURICIO FEDERICO; DELLA VÉDOVA, CARLOS OMAR; WILLNER, HELGE; BOESE, RONALD
Revista:
JOURNAL OF ORGANIC CHEMISTRY
Editorial:
American Chemical Society
Referencias:
Año: 2007 vol. 72 p. 9074 - 9074
ISSN:
0022-3263
Resumen:
Pure methoxycarbonylsulfenyl isocyanate, CH3OC(O)SNCO, is quantitatively prepared by the metathesis reaction between CH3OC(O)SCl and AgNCO. This novel species has been obtained in its pure form and characterized by 1H and 13C NMR, UV-vis, FTIR, and FT-Raman spectroscopy. The conformational properties of the gaseous molecule have been studied by vibrational spectroscopy and quantum chemical calculations (B3LYP and MP2 methods). The compound exhibits a conformational equilibrium at room temperature having the most stable form CS symmetry with the CdO double bond synperiplanar with respect to the S-N single bond. A second form was observed in the IR spectrum and corresponds to a conformer possessing the C-S bond antiperiplanar with respect to the NdC double bond of the isocyanate group. The structure of a single crystal of CH3OC(O)SNCO was determined by X-ray diffraction analysis at low temperature using a miniature zone melting procedure. The crystalline solid (triclinic, P1h, a= 8.292(6) Å, b= 9.839(7) Å, c= 11.865(8) Å, "alfa"= 67.290(2)°, "beta"= 71.5570(10)°, "gamma"= 83.4850(10)° and Z = 6) shows the presence of molecules having exclusively a synperiplanar conformation with respect to the three (CO-C=O), (O=C-SN), and (CS-N=C) dihedral angles.