title: Translation of pseudo-cross-conjugation into chemistry: cycloadditions of mesomeric betaines to the new ring system spiro[indazole-3,3'-pyrrole].
abstract: Indazolium-3-amidates (X-ray analysis), readily available on trapping the N-heterocyclic carbene indazol-3-ylidene with isocyanates, underwent [3+2]-cycloadditions with activated triple bonds to spiro[indazole-3,3'-pyrroles]. A combination of NMR techniques such as heteronuclear single quantum coherence (HSQC), heteronuclear multiple bond correlation (HMBC), nuclear Overhauser enhancement spectroscopy (NOESY), and 1H/15N correlations were applied to elucidate the structures of the cycloadducts.
authors.affiliation: Institute of Organic Chemistry, Leibnizstrasse 6, Clausthal University of Technology, D-38678 Clausthal-Zellerfeld, Germany. schmidt@ioc.tu-clausthal.de
authors.forename: Andreas
authors.initials: A
authors.lastname: Schmidt
authors.forename: Tobias
authors.initials: T
authors.lastname: Habeck
authors.forename: Anika Sabine
authors.initials: AS
authors.lastname: Lindner
authors.forename: Bohdan
authors.initials: B
authors.lastname: Snovydovych
authors.forename: Jan Christoph
authors.initials: JC
authors.lastname: Namyslo
authors.forename: Arnold
authors.initials: A
authors.lastname: Adam
authors.forename: Mimoza
authors.initials: M
authors.lastname: Gjikaj