By Gould R.F. (ed.)
Read or Download Chemical Reactions in Electrical Discharges PDF
Similar chemistry books
Nuclear Magnetic Resonance: A Review of Chemical Literature: Vol 31 (Specialist Periodical Reports)
As a spectroscopic procedure, Nuclear Magnetic Resonance (NMR) has obvious incredible progress over the last twenty years, either as a method and in its functions. this day the purposes of NMR span quite a lot of medical disciplines, from physics to biology to drugs. each one quantity of Nuclear Magnetic Resonance includes a mix of annual and biennial studies which jointly offer complete of the literature in this subject.
d-Orbitals in the Chemistry of Silicon, Phosphorus and Sulfur
This ebook was once undertaken for the aim of bringing jointly the generally diversified traces of experimental paintings and pondering which has been expressed yet has usually been unheard at the identify query. it is going to be transparent to the reader severe point of view has been maintained in assembling the fabric of this swiftly increasing sector of shock to natural chemists.
- Petrochemical Process v.2 Major Oxygenated, Chlorinated and Nitrated Derivatives
- Fate of Organic Pesticides in the Aquatic Environment
- Modern Aspects of Electrochemistry №16
- Concepts and Terminology in Organic Stereochemistry 1
- Chemistry, Biochemistry, and Pharmacological Activity of Prostanoids. Including the Proceedings of a Symposium on the Chemistry and Biochemistry of Prostanoids Held at The University of Salford, England, 10–14 July 1978
- Luminescence Applications in Biological, Chemical, Environmental and Hydrological Sciences
Additional info for Chemical Reactions in Electrical Discharges
Example text
Bakulev VA, Lebedev AT, Dankova EF et al (1989) Two directions of cyclization of α-diazo-β-dithioamides. New rearrangements of 1,2,3,-triazole-4-carbothiamides. Tetrahedron 45:7329–7340 23. Katritzky AR, Ji FB, Fan WQ et al (1992) Novel Dimroth rearrangements of the benzotriazole system: 4-amino-1-(arylsulfonyl)benzotriazoles to 4-[(arylsulfonyl)amino]benzotriazoles. J Org Chem 57:191–195 24. Temple DH, Smith JA, Montgomery JA (1972) Preparation and properties isomeric v-triazolopyridines. 1- and 3-Deaza-8-azapurines.
1-Sulfonyl-1,2,3-triazoles 163 are also capable of reacting with various nitriles under treatment with rhodium catalyst to form 1,2,4-subsituted imidazoles 164 in high to excellent yields [60] (Scheme 48). Both conventional and microwave heating give the same yield of the final products. A series of rhodium catalysts was examined and both rhodium(II) octanoate and Rh2(S-DOSP)4 were found to be the best. The reaction is found to be general with respect to triazole and nitrile components. Similarly to the reaction of triazolopyridine 161, the transformation of triazoles 163 is regioselective, forming only imidazole type products 164.
Triazoles 4–6 with unsubstituted ring nitrogen atom have special interest due to their importance for the synthesis of new derivatives. NH-triazoles 4–6 are thermodynamically stable tautomers. They exist in equilibrium in solutions and have very close values of Gibbs energy [1, 2, 6–12]. The ratio of tautomeric forms 4–6 can be determined by spectral methods, although it is impossible to separate them. In modern books it is a common practice not to put a certain form of tautomer to represent NH-1,2,3-triazoles, but rather to use generalized formulas, for example 7 or 10.