title: A novel azulene synthesis from the Ramirez ylide involving two different modes of its reaction with activated alkynes.
abstract: The Ramirez ylide undergoes electrophilic substitution with acetylenedicarboxylates to form Z and E adducts. The latter can react by cycloaddition with another equivalent of the alkyne to provide a new route to novel tetra-substituted azulenes, which show interesting bond localisation and crystal packing effects.
authors.affiliation: Chemistry Department, The Centre for Synthesis and Chemical Biology, Conway Institute of Biomolecular and Biomedical Sciences, University College Dublin, Dublin 4, Ireland.
authors.forename: Lee J
authors.initials: LJ
authors.lastname: Higham
authors.forename: P Gabriel
authors.initials: PG
authors.lastname: Kelly
authors.forename: David M
authors.initials: DM
authors.lastname: Corr
authors.forename: Helge
authors.initials: H
authors.lastname: Müller-Bunz
authors.forename: Brian J
authors.initials: BJ
authors.lastname: Walker
authors.forename: Declan G
authors.initials: DG
authors.lastname: Gilheany