✦ LIBER ✦

Correlations of N.M.R. spectral parameters with structure: benzylic coupling in substituted pyrazines

✍ Scribed by A.F. Bramwell; G. Riezebos; R.D. Wells

Book ID: 104247826
Publisher: Elsevier Science
Year: 1971
Tongue: French
Weight: 223 KB
Volume: 12
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)96899-6

No coin nor oath required. For personal study only.

✦ Synopsis

The recent isolation of pyrazines from various natural sources ( ) has stimulated interest in the characterisation of this class of compound.(2) For simple di-and trisubstituted pyrazines the main problem of structure elucidation is often the determination of the relative positions of the substituent groups on the pyrasine ring. in this respect n.m.r. coupling constant data are especially helpful. The purpose of the present conusunication is to present our preliminary observations on the phenomenon of beusylic coupling in substituted pyrasines. Susnsarised in the Table are the benzylic coupling constants for methylpyrasine and the three isomeric methoxy methylpyrazines, obtained by a first order analysis (at 60 MHz) of the splitting of the ring methyl signal. Long Range Splittings of Methyl Proton Signs1 Compound Solvent Coupling Constants (lfz)

📜 SIMILAR VOLUMES

The preparation and characterization of

The preparation and characterization of compounds of the types PtEt2diphos and PtEtCldiphos. Correlations of the 31P.N.M.R. spectral parameters with ring size

✍ D.A. Slack; M.C. Baird 📂 Article 📅 1977 🏛 Elsevier Science 🌐 English ⚖ 396 KB

A series of compounds of the type PtEtzdiphos (diphos = 1,2\_diphenylphosphinoethane, dppe; 1,3diphenylphosphinopropane, dppp, and l,Cdiphenylphosphinobutane, dppb) has been prepared. Selective cleavage of one ethyl group by hydrogen chloride gives the chloroethyl derivative, PtEtCldiphos, in each c

Structure of carbofuran in crosslinked s

Structure of carbofuran in crosslinked starch matrix by 13C n.m.r.: correlation of release and swelling kinetics with the dynamic behaviour of polymer chains

✍ Parshuram G. Shukla; Swaminathan Sivaram; Baijayantimala Mohanty 📂 Article 📅 1992 🏛 Elsevier Science 🌐 English ⚖ 412 KB

Correlation of one-bond 15N13C, 15NM,

Correlation of one-bond 15N13C, 15NM, 29SiX (M = 11B, 29Si, 119Sn, X = 1H, 13C) nuclear spin-spin coupling constants with the structure of metallatranes in solution

✍ E. Kupče; E. Liepiņš; A. Lapsiņa; I. Urtāne; G. Zelčāns; E. Lukevics 📂 Article 📅 1985 🏛 Elsevier Science 🌐 English ⚖ 1010 KB

Nuclear magnetic resonance spectra and c

Nuclear magnetic resonance spectra and chemical structure volume 1. The Spectral n.m.r. parameters of compounds with analysed spectra. Compiled by W. Brügel. Academic Press, New York and London. 235 pp + xviii. £16.6.6d $35.00

✍ Eric F. Mooney 📂 Article 📅 1969 🏛 John Wiley and Sons 🌐 English ⚖ 75 KB

Nuclear Magnetic Resonance Spectra and Chemical Structure Volume 1. The spectral n.m.r. parameters of compounds with analysed spectra. Compiled by W. Briigel.