摘要:
The synthesis and the full characterization of two new linear bisphosphonates ( tetraethyl(N-tert-butyl-1-aminoethan-1,1-diyl) bisphosphonate and tetraethyl(Nsecbutyl-1-aminoethan-1,1-diyl) bisphosphonate), and the first analysis of the ESR spectra of the corresponding nitroxides is reported. The preliminary results of theoretical calculations on model compounds suggest a small B-0 (in the McConnell equation). The results of bisphosphonate ester and bisphosphonic acid are similar. The discrepancies of P coupling for the diphosphorus compound stems from B-2 that is different when the dihedral angle is larger than 90 degrees.