13C NMR Study of 3,9-Di(alkylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiroundecanes

Article abstract of DOI:10.1002/mrc.1260230215

13C NMR chemical shifts and 13C-31P coupling constants of fourteen derivatives from 3,9-di(alkylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro<5.5>undecane and of eight derivatives of the 3.9-dioxo type are reported.All investigated compounds possess a chair conformation with the lone pair or the phosphoryl oxygen in the equatorial position.The alkylphenoxy groups are in a cis position with respect to the lone pair or the phosphoryl oxygen.Conformational changes about the aryl-O bond can be minitored via 31P-O-C-13C couplings and their angular dependence was found to be non-symmetric.