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DOI: 10.1055/s-0031-1289716
Chemistry of Halonitroethenes, Part 2: Trichloronitroethene as a Building Block for the Novel Synthesis of 5-Chloro(nitro)methyl-Substituted 1-Aryltetrazoles
Publication History
Publication Date:
17 February 2012 (online)

Abstract
Conversion of 1,1,2-trichloro-2-nitroethene with an excess of 1H-benzotriazole, followed by transamination of the resulting 1,1-bis(benzotriazol-1-yl)-2-chloro-2-nitroethene with different aniline derivatives provides the corresponding 1-(arylimino)-1-(benzotriazolyl)ethanes. Upon cycloaddition with sodium azide, these amidines enable the formation of hitherto unknown 1-aryltetrazoles bearing a chloro(nitro)methyl group in the 5-position. The structure of a 4-fluorophenyl derivative was proven by single-crystal X-ray diffraction analysis. Starting from arenediamines, this reaction affords bistetrazoles. In addition, the tetrazoles are interesting starting materials for further conversions of the side chain.
Key words
nitro compounds - nucleophilic substitution - amidines - arenes - heterocycles - tetrazoles
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References
X-ray crystal structure analysis for
C8H5ClFN5O2, M = 257.62
g mol-¹: A suitable single crystal
of the title compound was selected under a polarization microscope
and mounted in a glass capillary (d = 0.3
mm). The crystal structure was determined by X-ray diffraction analysis
using graphite monochromated MoKα radiation (0.71073 Å) [T = 223(2)
K], whereas the scattering intensities were collected with
a single crystal diffractometer (STOE IPDS II). The crystal structure
was solved by Direct Methods using SHELXS-978 and refined
using alternating cycles of least squares refinements against F
² (SHELXL-978).
All non-H atoms were located in Difference Fourier maps and were
refined with anisotropic displacement parameters. The H positions
were determined by a final Difference Fourier Synthesis. C8H5ClFN5O2 crystallized
in the orthorhombic space group Pna21 (No.
33), lattice parameters a = 13.458(4) Å, b = 6.058(2) Å, c = 25.281(9) Å, β = 103.88(3)˚, V = 2061.1(1) ų, Z = 8, d
calc = 1.660
g cm-³, F(000) = 1040 using
3597 independent reflections and 348 parameters. R1 = 0.0605, wR2 = 0.1023 [I > 2σ(I)], goodness of fit on F2 = 1.085,
residual electron density = 0.672 and -0.424 e Å-³.
Further details of the crystal structure investigations have been
deposited with the Cambridge Crystallographic Data Center, CCDC
826045. Copies of this information may be obtained free of charge
from The Director, CCDC, 12 Union Road, Cambridge, CB2
1EZ, UK [Fax:
+44 (1223)336 033; e-mail:
fileserv@ccdc.ac.uk or
http://www.ccdc.cam.ac.uk].