title: Photodimerization of HCl salts of azastilbenes in the solid state.
abstract: A simple strategy that is based on conversion of an electron-rich pyridyl to an electron-deficient pyridinium ion is able to orient thirteen of the sixteen olefins investigated towards a single dimer in quantitative yield in the crystalline state. The reagent used is HCl, the method involves grinding the olefin with a drop of HCl and the dimerization is achieved by exposure of the crystalline stilbazolium·HCl salts to light. The weak force involved in modifying the crystal packing is most likely charge-transfer interaction.
authors.affiliation: Department of Chemistry, University of Miami, Coral Gables, FL 33146, USA.
authors.forename: Barnali
authors.initials: B
authors.lastname: Mondal
authors.forename: Burjor
authors.initials: B
authors.lastname: Captain
authors.forename: V
authors.initials: V
authors.lastname: Ramamurthy