A copper-polyol complex: [Na2(C2H6O2)6][Cu(C2H4O2)2].

The ionic title complex, bis(mu-ethylene glycol)-kappa(3)O,O':O';kappa(3)O:O,O'-bis[(ethylene glycol-kappa(2)O,O')(ethylene glycol-kappaO)sodium] bis(ethylene glycolato-kappa(2)O,O')copper(II), [Na(2)(C(2)H(6)O(2))(6)][Cu(C(2)H(4)O(2))(2)], was obtained from a basic solution of CuCl(2) in ethylene glycol and consists of discrete ions interconnected by O-H...

Competitive intermolecular pericyclic reactions of free and complexed cyclopentyne.

Intermolecular competition for cyclopentyne by different alkenes supports the hypothesis that organolithium-promoted decomposition of precursors to cyclopentyne affords one or more lithium-ion-complexed species. Competition reactions with mixtures of 2,3-dihydropyran do not clearly differentiate between complexed and unencumbered (free) forms of cyclopentyne, but those involving spirodiene 2 and cyclohexene do. Remarkably, the cycloaddition reactions of free cyclopentyne are not diffusion-controlled despite its high reactivity.