title: Preparation and NMR spectra of four isomeric diformyl[2.2]paracyclophanes (cyclophanes 66).
abstract: Four isomeric dialdehydes 4, readily available from cycloaddition of propiolic aldehyde (2) to 1,2,4,5-hexatetraene (1), were separated by chromatography and recrystallization, and were characterized by their spectroscopic data. The individual isomers can now be easily identified from their ¹H NMR spectra even if only one of them is present.
authors.affiliation: Institut für Organische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany.
authors.forename: Ina
authors.initials: I
authors.lastname: Dix
authors.forename: Henning
authors.initials: H
authors.lastname: Hopf
authors.forename: Thota B N
authors.initials: TB
authors.lastname: Satyanarayana
authors.forename: Ludger
authors.initials: L
authors.lastname: Ernst