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- W2035876670 abstract "It has been demonstrated that the methyl and ring C-atoms of methyl-1,3-cyclohexadienes interchange their positions intramolecularly during the thermal conversion to toluene at temperatures above 600°C in a quartz flow system. Gas phase pyrolysis of double 13C-labeled methyl-1,3-cyclohexadienes with 13C-labels for the primary and the tertiary C-atom gave definite 13C-distribution patterns in the aromatic ring systems of the formed toluene as well as benzene with far-reaching similarities. The NMR data of the [13C2]toluene isotopomers definitely rule out that the observed integration of the methyl C-atom into the ring system proceeds via the hitherto well-established sequence: electrocyclic ring opening of the 5-methyl-1,3-cyclohexadiene to 1,3,5-heptatriene, its sigmatropic 1,7-H shift and ensuing recyclization of the 1,3,5-heptatriene to methyl-1,3-cyclohexadienes." @default.
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- W2035876670 date "1994-01-01" @default.
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- W2035876670 title "The thermal Aromatization of Methyl-1,3-cyclohexadienes - an important argument against commonly accepted sigmatropic 1,7-H-shift reactions" @default.
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- W2035876670 doi "https://doi.org/10.1002/prac.19943360303" @default.
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