Journal of the Chemical Society, Dalton Transactions p. 911 - 917 (1980)
Update date:2022-08-05
Topics:
Mays, Martin J.
Gavens, Paul D.
The preparation of the complexes A variable-temperature (13)C n.m.r. spectroscopic study of these complexes shows that, for n = 1, only the axial isomer is present in significant concentrations in solution at low temperatures, except for the most bulky ligand, CNBut, for which an equilibrium mixture of the axial and equatorial isomer is obtained at -60 deg C.Above O deg C these isomers interconvert rapidly on the n.m.r. time scale.For n = 2 only the trans-diaxially substituted isomers are present at low temperatures except in fthe case of CNBut for which a mixture of the trans-diaxial and a diequatorially substituted isomer is obtained.For the trisubstituted complex both CNBun and CNBut give a mixture of isomers at low temperature which again interconvert rapidly at higher temperatures.The same is true of the tetrasubstituted complex with CNBun as a ligand but with CNBut only an all-axially substituted isomer is found.
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