Dimethylformamide diethylacetal → 7-benzyl-octahydro-5H,9bH-2a,4a,7,9a-tetraazacycloocta[cd]pentalene

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A solution of 1-benzyl-1,4,7,10-tetraazacyclododecane (4 g; 0.015 mol ) and dimethylformamide diethylacetal (6.88 g; 0.0467 mol) in benzene (40 ml ) is heated at 80° C. and the azeotropic mixture ethanol-benzene is distilled away. When the conversion is ended, the solvent is evaporated under reduced pressure and the final product is obtained as a yellow oil (4.0 g). Yield 96%

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