title: Orthoamides and iminium salts LXXII: N,N,N',N',N'',N'',N''',N'''-octamethyl-(but-2-yne)-bis(amidinium) tetrafluoroborate: the first bis-amidinium salt of acetylenedicarboxyclic acid. A new superelectrophile?
abstract: A method for the preparation of the first acetylenedicarboxamidinium salt from a bis-orthoamide derivative of acetylenedicarboxyclic acid has been established. The salt reacted with cyclopentadiene and furan at room temperature to give bicyclic [4+2]-cycloaddition products. The solid compounds were characterized by solution NMR spectroscopy and by single-crystal X-ray diffraction. Quantum-chemical calculations of the isolated N,N,N',N',N'',N'',N''',N'''-octamethyl-acetylene-bis(carboxamidinium) ion showed very good agreement with the spectroscopic and diffraction data.
authors.affiliation: Fakultät Chemie/Organische Chemie, Hochschule Aalen, Beethovenstr. 1, 73430 Aalen, Germany.
authors.forename: Konstantin
authors.initials: K
authors.lastname: Drandarov
authors.forename: Ioannis
authors.initials: I
authors.lastname: Tiritiris
authors.forename: Olga
authors.initials: O
authors.lastname: Wassiljew
authors.forename: Hans-Ullrich
authors.initials: HU
authors.lastname: Siehl
authors.forename: Willi
authors.initials: W
authors.lastname: Kantlehner