Dimethylformamide dimethyl acetal → Hexahydro-2a1H-2a,4a,6a-triazacyclopenta[cd]pentalene

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A reaction mixture of 4.00 g (31 mmol) of 1,4,7-triazacyclononane (perhydro-1,4,7-triazonine), 3.70 g (31 mmol) of dimethylformamide dimethyl acetal and 50 ml of dry benzene was distilled through a spinning band column until the by-products and solvent were removed (dimethylamine, benzene-methanol azeotrope, bp 58°, and benzene, bp 80°). The residue was then distilled through a shortpath apparatus giving 3.68 g (86%) of clear, colorless liquid, bp 80°-82° (2.5 mm), nD24 = 1.5175. Redistillation of a small sample in a molecular still at 80° (0.4 mm) gave an analytical sample of 1,4,7-triazatricyclo[5.2.1.04,10 ]decane.

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