The Journal of Organic Chemistry

Carbon-13 nuclear magnetic resonance of organophosphorus compounds. III. Phosphorus heterocycles

GA Gray, SE Cremer

Index: Gray,G.A.; Cremer,S.E. Journal of Organic Chemistry, 1972 , vol. 37, p. 3458 - 3469

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Citation Number: 41

Abstract

Results The carbon chemical shifts (Tables I-VIII) are most easily assigned in the symmetrical 2, 2, 3, 4, 4-pentamethylphosphetanes in Table I. The large 13C-31P coupling and high shift (low shielding), as well as the twofold intensity, allow C-2 and C-4 to be identified. The high shift of C-3 is characterktic of a tertiary carbon. C-7 gives a shift normal for a free methyl bound to a carbon atom and has unit intensity. The remaining two ...