title: Rotational spectrum and internal dynamics of methylpyruvate.
abstract: The rotational spectra of five isotopologues (normal and all monosubstituted (13)C species) of methylpyruvate have been measured with the pulsed jet Fourier transform microwave technique. Rotational transitions are split into quintets due to the internal rotations of the two methyl groups. The corresponding barriers to internal rotation have been determined to be V(3)(H(3)C-O) = 4.883(8) kJ mol(-1) and V(3)(H(3)C-C) = 4.657(8) kJ mol(-1), respectively. Information on the skeletal heavy atom structure has been obtained from the 15 available rotational constants.
authors.affiliation: Dipartimento di Chimica Fisica e Inorganica dell'Università, Viale Risorgimento 4, I-40136 Bologna, Italy.
authors.forename: Biagio
authors.initials: B
authors.lastname: Velino
authors.forename: Laura B
authors.initials: LB
authors.lastname: Favero
authors.forename: Paolo
authors.initials: P
authors.lastname: Ottaviani
authors.forename: Assimo
authors.initials: A
authors.lastname: Maris
authors.forename: Walther
authors.initials: W
authors.lastname: Caminati
mesh_terms: D005583:Fourier Analysis; D008872:Microwaves; D011773:Pyruvates / Q000737:chemistry*; D011789:Quantum Theory; D012399:Rotation
chemical_list: D011773:Pyruvates