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Stretching Frequency and Force Constant of the Tungsten-Carbon Triple Bond

✍ Scribed by Prof. Dr. Ernst Otto Fischer; Dr. Nguyen Quy Dao; Dipl.-Chem. Wolfgang Rainer Wagner

Publisher: John Wiley and Sons
Year: 1978
Tongue: English
Weight: 240 KB
Volume: 17
Category: Article
ISSN: 0044-8249
DOI: 10.1002/anie.197800501

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✦ Synopsis

bulky groups. In the erythro series, on the other hand, chelation requires an increase in the proportion of (E,) or (Ec), and 5 2 3 progressively decreases to a limiting value which agrees closely with the calculated figure. Although both of these rotamers have four adjacent bulky groups, chelation with a lanthanide ion must be sufficient to overcome steric repulsion when there is no alternative.

Confirmation of this interpretation, based on chemical shift data, is available in work on other bifunctional However, direct evidence of bidentate coordination from suitable coupling constants has not hitherto been reported.

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