Through complete neglect of differential overlap (CNDO) calculations of the electronic energy among different possible structures of paracetamol (PA) molecule, it has been concluded that its structure has Cs point group symmetry of the cis -form in which the methyl group has a restricted free rotation around its bond with the carbon atom of the amide group. The electronic spectra of PA compound were studied in different polar and nonpolar solvents. The temperature effect on the electronic spectra confirms the presence of one conformer only. The hydrogen bonding and the orientation energies of the polar solvents were determined from the studies of mixed solvents. Complexes of PA with metal ions M(II) (Cu++, Zn++, or Fe++) of ratio 2:1, respectively, were prepared, and their structure has been confirmed by elemental analysis, atomic absorption spectra, IR spectra, and 1H-NMR spectra. It has been concluded that the structure of the complexes has C2h point group symmetry in which two PA molecules are chelated to any one of the metal ions Cu++, Zn++, and Fe++. Copyright © Taylor & Francis Group, LLC.

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ABSTRACT: A modern method for the preparation of some new
N-arylthiophene-2-carboxamidines via amidinyl radicals generated
using UV−vis-light promoting the reduction of N-arylthiophene-2-
carboxamidoximes without any catalyst in a short amount of time,
highly straight forward, and in an efficient manner is described.
This method defeats the flaws of the conventional methods for the
reduction of amidoxime derivatives to amidine derivatives, which
require harsh conditions such as using a strong acid, high
temperature, and expensive catalysts. Benzo[d]imidazoles, benzo-
[d]oxazoles, and amides can also be synthesized by applying this
method. The photoproducts were analyzed by various spectroscopic
and analytical techniques, including thin-layer chromatography,
column chromatography, high-performance liquid chromatography, gas chromatography/mass spectrometry, IR, 1H NMR,
13C NMR, and MS. Notably, the chromatographic analyses proved that the best time for the production of N-arylthiophene-2-
carboxamidines is 20 min. The reaction mechanism comprising pathways and intermediates was also suggested via the homolysis of
N−O and C−N bonds.

ABSTRACT: A modern method for the preparation of some new
N-arylthiophene-2-carboxamidines via amidinyl radicals generated
using UV−vis-light promoting the reduction of N-arylthiophene-2-
carboxamidoximes without any catalyst in a short amount of time,
highly straight forward, and in an efficient manner is described.
This method defeats the flaws of the conventional methods for the
reduction of amidoxime derivatives to amidine derivatives, which
require harsh conditions such as using a strong acid, high
temperature, and expensive catalysts. Benzo[d]imidazoles, benzo-
[d]oxazoles, and amides can also be synthesized by applying this
method. The photoproducts were analyzed by various spectroscopic
and analytical techniques, including thin-layer chromatography,
column chromatography, high-performance liquid chromatography, gas chromatography/mass spectrometry, IR, 1H NMR,
13C NMR, and MS. Notably, the chromatographic analyses proved that the best time for the production of N-arylthiophene-2-
carboxamidines is 20 min. The reaction mechanism comprising pathways and intermediates was also suggested via the homolysis of
N−O and C−N bonds.

ABSTRACT: A modern method for the preparation of some new
N-arylthiophene-2-carboxamidines via amidinyl radicals generated
using UV−vis-light promoting the reduction of N-arylthiophene-2-
carboxamidoximes without any catalyst in a short amount of time,
highly straight forward, and in an efficient manner is described.
This method defeats the flaws of the conventional methods for the
reduction of amidoxime derivatives to amidine derivatives, which
require harsh conditions such as using a strong acid, high
temperature, and expensive catalysts. Benzo[d]imidazoles, benzo-
[d]oxazoles, and amides can also be synthesized by applying this
method. The photoproducts were analyzed by various spectroscopic
and analytical techniques, including thin-layer chromatography,
column chromatography, high-performance liquid chromatography, gas chromatography/mass spectrometry, IR, 1H NMR,
13C NMR, and MS. Notably, the chromatographic analyses proved that the best time for the production of N-arylthiophene-2-
carboxamidines is 20 min. The reaction mechanism comprising pathways and intermediates was also suggested via the homolysis of
N−O and C−N bonds.