84038-98-2Relevant academic research and scientific papers
Cycloadducts with Alternate Structure from 7,7-Difluoro- and 7,7-Dialkoxy-1,3,5-cycloheptatrienes and 4-Phenyl-1,2,4-triazoline-3,5-dione
Welt, Guenther,Wolf, Elisabeth,Fischer, Peter,Foehlisch, Baldur
, p. 3427 - 3435 (2007/10/02)
With 4-phenyl-1,2,4-triazoline-3,5-dione (PTAD), 7,7-difluoro-, 7,7-dimethoxy-, 7,7-(trimethylenedioxy)- and 7,7-(ethylenedioxy)-1,3,5-cycloheptatriene (1c - f) form 1:1 cycloadducts of different structure.For the cycloadducts from 1d, e and cycloheptatriene itself, 13C and 1H NMR spectra establish a structure formally derived from the norcaradiene valence tautomer (2a, d, e) by cycloaddition (NCD-type, 4). 1c, f and tropone, on the other hand, undergo cycloaddition at C-1/C-4 of the cycloheptatriene skeleton, yielding adducts of the CHT-type 3.
