Issue 9, 2003

Synthesis, spectroscopy and structure of CF3CH2OCN, CF3CH2NCO, and (CF3CH2O)2CNH

Abstract

The reaction between BrCN and CF3CH2OH in the presence of Et3N has been investigated in acetone and ether solvents. Three different products have been isolated in the reaction, CF3CH2OCN (1), the novel molecule (CF3CH2O)2CNH (2), and Et2NCN. The product ratio is observed to depend strongly on (i) the solvent used, (ii) the ratio of the reagents, and (iii) the speed of the addition of Et3N to the reaction mixture. By varying these factors, either 1 or 2 can be obtained as the major reaction product. CF3CH2NCO (3) is generated in the gas phase by thermolysis of 2 and Ph2NC(O)NHCH2CF3 precursors. 1, 2, and 3 are characterized in the gas phase by infrared, 2 in the liquid state by Raman, and 1 and 2 in solution by NMR spectroscopies for the first time. The molecular geometries and energetics of the possible conformers are obtained from DFT calculations at the B3LYP level of theory. The observed vibrational frequencies are compared with the results of the DFT calculations, supporting the identification and assisting with the assignments.

Supplementary files

Article information

Article type
Paper
Submitted
23 Dec 2002
Accepted
19 Mar 2003
First published
02 Apr 2003

Phys. Chem. Chem. Phys., 2003,5, 1752-1759

Synthesis, spectroscopy and structure of CF3CH2OCN, CF3CH2NCO, and (CF3CH2O)2CNH

T. Pasinszki and B. Havasi, Phys. Chem. Chem. Phys., 2003, 5, 1752 DOI: 10.1039/B212777F

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