Abstract
Intensive 1H-, 13C-, and 31P-NMR studies of 1-tert-butyl-3-methyl-2,4-bis(2,4,6-tri-tert-butylphenyl)-1,3-diphosphacyclobutane-2,4-diyl were perfomed to reveal several unusual coupling constants.
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Acknowledgments
We thank Professor Russell Timkovich, The University of Alabama, for valuable comments on NMR measurement and interpretations.