Abstract
The kinetics and mechanism of circumambulatory rearrangements of N-centered (NCS) and S-centered (SPh, SC3Ph3, SC(OEt)=S) groups in corresponding derivatives of 1,2,3-triphenylcyclopropene and cycloheptatriene were studied by dynamic1H and13C NMR spectroscopy. Migrations of the isothiocyanate group occur by the dissociation-recombination mechanism with intermediate formation of a tight ionic pair. Migrations of the phenylthio group around the perimeter of cyclopropene and cycloheptatriene rings occur by the 1,2-shift mechanism. It was found that rearrangements of theO-ethyl dithiocarbonate group inS-(1,2,3-triphenylcyclopropen-3-yl)-O-ethyl dithiocarbonate occur by the 3,3-sigmatropic shift mechanism. The molecular and crystal structure ofO-ethylS-(1,2,3-triphenylcyclopropen-3-yl) dithiocarbonate was studied by X-ray analysis.
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Institut für Chemie, Humboldt Universität, D-10115 Berlin, Deutschland.
Translated fromIzvestiya Akademii Nauk Seriya Khimicheskaya, No. 5, pp. 913–923, May, 1998.
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Minkin, V.I., Mikhailov, I.E., Dushenko, G.A. et al. Fast and reversible migrations of N,S-centered groups around the perimeter of cyclopropene and cycloheptatriene rings. Russ Chem Bull 47, 884–894 (1998). https://doi.org/10.1007/BF02498157
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DOI: https://doi.org/10.1007/BF02498157