title: A "green" method for isolation of cucurbit[7]uril via a solid state metathesis reaction.
abstract: A method to isolate CB[7] from a CB[5]/CB[7] mixture has been successfully developed by incorporating an alkyl-imidazolium ionic liquid guest of the type [C(n)mim]Br which is only capable of binding with CB[7]. This CB[7]-[C(n)mim]Br complex can be removed from the mixture and a subsequent solid state ion metathesis affords pure CB[7]. Moreover, the imidazolium ionic liquids can be recycled from the aqueous solution after the purification thus providing a 'green' process.
authors.affiliation: Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Cambridge, UK CB2 1EW.
authors.forename: Dezhi
authors.initials: D
authors.lastname: Jiao
authors.forename: Nan
authors.initials: N
authors.lastname: Zhao
authors.forename: Oren A
authors.initials: OA
authors.lastname: Scherman