Anhydrous hydrazine is isolated in a pure state as a stable inclusion complex crystal with hydroquinone or p-methoxyphenol, the X-ray structures of which have been analysed; the solid-state reaction of the hydrazine inclusion complex and esters gives hydrazides which are virtually uncontaminated with acid hydrazine salt byproducts.

The complete resolution of 2,2[prime or minute]-dihydroxy-1,1[prime or minute]-binaphthyl into its enantiomers by inclusion complexation with a commercially available derivative of choline, is reported. The two enantiomers are recovered in >99% ee from the inclusion complexes by simple dissolution in a diethyl ether-water medium and the resolving agent can be recycled.

The crystallization of CuCl-assisted dimerization of 2-bromo-3,4-bis(diphenylmethylene)cyclobutanone revealed two polymorphs (3 and 4). The dimer was intended to be a precursor to bis-radialenes. Attempts to dehydrogenate the compound to the true bis-radialene failed. This failure may be attributed to the overcrowding of the precursor. Dimerization was not observed in a similar reaction of 2,2-dibromo-3,4-bis(diphenylmethylene)cyclobutanone, and 5 was the only product obtained. The crystal structures of the three products are described. The overcrowding expressed by torsion angles is calculated, and experimental conformations of the central ring are compared for [3], [4], [5], and [6]radialenes.

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