A reanalysis of the vibrational ground-state microwave spectra of various isotopic versions of propadienone including lines assigned to the new 1-13C isotope, and taking into account the molecular nonrigidity, has been undertaken in order to determine more precisely the molecular structure.The nonlinear heavy-atom chain is found to have a zigzag conformation with angles C1C2C3=144.5 deg and OC1C2=169.4 deg.The vibrational potential function corresponding to this unusual structure has aspects that can be linked with structural features of a number of related molecules.
Brown, Ronald D.,Champion, Robert,Elmes, Patricia S.,Godfrey, Peter D.
Synthesis of a perfluorocarbon telomer derived from tris-(hydroxymethyl) 14C and 13C-acrylamidomethane
F5TAC5 a Perfluoroalkylated telomer, was labeled by 14C and 13C on the carbonyl group from acrylic acid 14C. The synthesis of this compound was performed via a five steps procedure. The labelling yield calculated from the precursor (Ba14 or 13CO2) is in the range of 25-30%.
Azim,Madelmont,Rapp,Maurizis,Pavia,Pucci,Veyre
p. 307 - 311
(2007/10/02)
A MECHANISTIC STUDY OF PYRROLE FORMATION IN THE HBF4-CATALYZED THERMOLYSIS OF CYCLOPROPYL KETIMINES.
A study of the HBF4-catalyzed rearrangement of 1-(1-piperidino)cyclopropyl ketimines to 2-substituted pyrroles has been conducted using carbon-13 labeled starting material.The results support the formation of a bicyclic aziridine-containing intermediate.
Wasserman, Harry H.,Fukuyama, James M.
p. 7127 - 7130
(2007/10/02)
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