By F. Scheinmann
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Hence the molar percentage proportion of pyrophosphate in the binary mixture is [22/(22 + 81)] 100 = 21 % (or [11/51] 100, using the second set of figures. The accuracy of such analyses is probably within ± 5 %. (5) The orientation uf substituents on a benzenoid ring can often be achieved very rapidly by proton magnetic resonance spectroscopy and tedious chemical work is thereby saved. Use is made of the splitting pattern and established values of the couplings between o-, m-, and p-orientated hydrogens on a benzene ring, namely 7-10, 2-3, and 0-1 Hz respectively.
Proton magnetic resonance spectrum of a tetra-acetoxydinitrocyclohexane. reasonable for axial-axial coupling (φ *= 180°) and for axial-equatorial (or equatorialequatorial) coupling (φ « 60°). The ring-protons must therefore be arranged aaeaae round the cyclohexane system as in (XXVIII). The protons responsible for the triplet O7N (XXVIII) (XXIX) 54 SPECTROSCOPIC M E T H O D S V O L U M E 1 signal (which shows only the small splitting) must be the equatorial ones. No other arrangement would lead to the observed splitting pattern.
A. ELVIDGE, and D. E. H. JONES, / . Chem. Soc, 1964, 1423. 16. C. F. CALLIS, J. R. VAN WAZER, J. N. SHOOLERY, and W. A. ANDERSON, / . Amer. Chem. Soc, 1957, 79, 2719. 17. (a) J. A. ELVIDGE, G. T. NEWBOLD, A. PERCIVAL, and I. R. SENCIALL, J. Chem. Soc, 1965, 5119. (b) J. A. ELVIDGE, / . Chem. Soc, 1959, 474. 18. U. EISNER, J. A. ELVIDGE, and R. P. LINSTEAD, J. Chem. Soc, 1953, 1372. 19. J. A. ELVIDGE and P. D. RALPH, / . Chem. Soc. B, 1966, 243. 20. Ref. le, Vol. 2, p. 681. 21. M. KARPLUS, / . , 1959, 30, 11.