Purple benzene revisited

Abstract

A variant of the referenced demonstration using crown ethers.

Crystal structures of two solvates of (18-crown-6)potassium acetate

“…Moreover, since the early days of crown-ether chemistry, 18-crown-6 has been used to enhance the solubility of reactive potassium salts in organic media, e.g. KMnO 4 (Doheny & Ganem, 1980). [K(18c6)]OAc (OAc = acetate) has been shown to be useful as an acetylation agent for alkyl halides (Liotta et al, 1974), and over the past few years 'CECILs' (crown ether complex cation ionic liquids) such as [K(18c6)]OAc and [K(18c6)]OH gained in importance as basic catalysts for various organic transformations (e.g.…”

Preparation of a stoichiometric complex of hydronium tetrafluoroborate and 18-crown-6 by phase transfer

“…Because of the short preparation time and simple product workup, many students will have the opportunity to complete this experiment in less than one laboratory session. If so, this work can be used as a complement to experiments on crown ethers described in THIS JOURNAL (5,8) or elsewhere (9).…”

Colorful Chemical Demonstrations on the Extraction of Anionic Species from Water into Ether Mediated by Tricaprylylmethylammonium Chloride (Aliquat 336), a Liquid–Liquid Phase-Transfer Agent

“…• The oxidation of cyclohexene with KMnO 4 in benzene with either crown ether (18) or Aliquat 336 (19) as the LLPTcatalyst. It is found that the experimental procedure described in entry 5 can be used to oxidize cyclohexene.…”