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Carbon-13 nuclear magnetic resonance spectroscopy of polychlorinated diphenyl ethers

✍ Scribed by Ulf Edlund; Åke Norström

Publisher
John Wiley and Sons
Year
1977
Tongue
English
Weight
664 KB
Volume
9
Category
Article
ISSN
0749-1581

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✦ Synopsis

Abstract

Carbon‐13 n.m.r. chemical shifts are reported for diphenyl ether and several of its chlorinated analogs. Carbon shieldings were found to be dependent on the degree of steric interference to conjugative release by the oxygen atom. Substituent effects due to attached chlorine atoms seem to be more easily transmitted into the adjacent aryl moiety if the number of ortho chlorines is reduced. These results were clearly seen by a variable‐by‐variable plot display or by using a pattern recognition computer program. Spin‐lattice relaxation times have been measured for several compounds mainly for assignment purposes, but they are also briefly discussed in view of possible interconversion mechanisms.

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