Concepedia

High‐resolution <sup>13</sup>C NMR studies of proanthocyanidin polymers (condensed tannins)

Roger H. Newman, Lawrence J. Porter, Lai Yeap Foo, S. R. Johns, Richard I. Willing

Magnetic Resonance in Chemistry · 1987 · 62 citations · 13 references

DOI

Concepts

Abstract

Abstract High‐resolution 13 C NMR spectra of some proanthocyanidin polymers are presented. They were measured in acetone‐ d 6 ‐water (1:1, v/v ) solution at 30 °C and at 62.5 MHz. The chemical shifts of selected resonances in these spectra were compared with those of structurally related monomers and oligomers. These comparisons enable certain deductions to be made regarding the stereochemistry and mode of linkage of the constituent flavanoid monomer units of these polymers.

References

13

Polymeric proanthocyanidins. Stereochemistry, structural units, and molecular weight

Z. Czochanska, Lai Yeap Foo, Roger H. Newman et al. · Journal of the Chemical Society Perkin Transactions 1 · 1980 · 282 citations

, , +14

Plant proanthocyanidins. Part 3. Conformational and configurational studies of natural procyanidins

Anthony C. Fletcher, Lawrence J. Porter, Edwin Haslam et al. · Journal of the Chemical Society Perkin Transactions 1 · 1977 · 193 citations

, , +16

The phytochemistry of proanthocyanidin polymers

Lai Yeap Foo, Lawrence J. Porter · Phytochemistry · 1980 · 159 citations

, , +12

Synthesis of condensed tannins. Part 9. The condensation sequence of leucocyanidin with (+)-catechin and with the resultant procyanidins

Jan A. Delcour, Daneel Ferreira, David G. Roux · Journal of the Chemical Society Perkin Transactions 1 · 1983 · 119 citations

, , +15

Polymeric proanthocyanidins. 13C N.m.r. studies of procyanidins

Lawrence J. Porter, Roger H. Newman, Lai Yeap Foo et al. · Journal of the Chemical Society Perkin Transactions 1 · 1982 · 113 citations

, , +10