Results 171 to 180 of about 13,090 (233)
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On the pyrazine and pyrazine–pyrimidine dimers
The Journal of Chemical Physics, 1986Spectra of the pyrazine-d4, pyrazine-h4–pyrazine-d4, and pyrazine-d4–pyrimidine dimer are obtained and analyzed with the help of Lennard-Jones–hydrogen-bonding (LJ–HB) potential energy calculations. The pyrazine isotopic hetero and homo dimers possess nearly identical spectra with the exception that the perpendicular dimer features are displaced to the
J. Wanna, E. R. Bernstein
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Pyrazine Analogues of Dipyrrolylquinoxalines
Organic Letters, 2003[structure: see text]. The synthesis of novel pyrazine derivatives bearing pyrrolic substituents is reported; the ability of these systems to bind certain biologically relevant anions in dichloromethane is also detailed.
Jonathan L, Sessler +3 more
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Microbial metabolism of pyrazines
Critical Reviews in Microbiology, 2011Pyrazines are a group of 1,4 dinitrogen substituted benzenes. They have near ubiquitous biological distribution and majority are anthropogenic. The demand for pyrazines in the recent years has increased owing to their vast applications in the field of food, agriculture and medicine.
K S, Rajini +3 more
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Proceedings of the Royal Society of London. Series B: Biological Sciences, 1990
Of the various types of alerting signals found in nature, odours are the least well understood. The worldwide distribution of pyrazines in plants, insects, terrestrial vertebrates, marine organisms, fungi and bacteria suggests that they are of special significance.
A, Woolfson, M, Rothschild
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Of the various types of alerting signals found in nature, odours are the least well understood. The worldwide distribution of pyrazines in plants, insects, terrestrial vertebrates, marine organisms, fungi and bacteria suggests that they are of special significance.
A, Woolfson, M, Rothschild
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Vibrational spectra of [1H4]pyrazine and [2H4]pyrazine
Journal of the Chemical Society, Faraday Transactions 2, 1985Infrared and Raman spectra of [1H4]pyrazine and [2H4]pyrazine have been reinvestigated and a general assignment of all the observed bands is proposed which modifies some previous assignments of fundamental vibrations. The present assignment satisfies the isotopic product rule for i.r.- and Raman-active fundamentals.
Juan F. Arenas +4 more
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Synthesis of tetrasubstituted pyrazines and pyrazine N-oxides
Tetrahedron Letters, 2010Abstract An efficient synthesis of tetrasubstituted unsymmetrical pyrazines and their related pyrazine N-oxides has been developed from commercially available 2-chloro-3-methylpyrazine. The procedure and scope of these synthesis routes are described.
Jae Uk Jeong +3 more
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2,3,5,6-Tetrakis(phenoxymethyl)pyrazine and 2,3,5,6-tetrakis(phenylsulfanylmethyl)pyrazine
Acta Crystallographica Section C Crystal Structure Communications, 2007The title compounds, C(32)H(28)N(2)O(4), (I), and C(32)H(28)N(2)S(4), (II), respectively, are tetrasubstituted pyrazines and both possess C(i) symmetry. They differ only in the hetero atom (X) of the -CH(2)XPh side-arm substituents: X = O in (I) and S in (II).
Assoumatine T +2 more
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The pyrazine-binding protein and olfaction
Comparative Biochemistry and Physiology Part B: Comparative Biochemistry, 19881. The present results provide circumstantial evidence, but not a proof, that the Pyrazine-binding Protein is an odorant carrier molecule of fundamental importance. 2. At first sight a role for a secretory protein in olfaction is not obvious. 3.
BIGNETTI, Enrico +4 more
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Vapour and crystal spectra in polarized light of pyrazine-d0, cis pyrazine-d2 and pyrazine-d4
Spectrochimica Acta, 1964Abstract The infrared spectra of pyrazine-d0, cis pyrazine-d2 and pyrazine-d4 have been measured between 4000 and 400 cm−1. The spectra have been obtained in the vapour and solid states. The dichroic behaviour of the bands has been measured on polycrystalline fully oriented samples.
S. Califano, G. Adembri, G. Sbrana
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