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Zinc dichloride reacts with aminomethylpyridine (AMP) to the corresponding 1:1 adduct 1, whereas ZnBr 2  forms an ionic 1:2 complex of the type [(AMP) 2 ZnBr] +  Br -  2, which loses one neutral coligand upon heating in Me-C (O)OEt to yield nearly insoluble (AM P)ZnBr 2  3. The condensation reaction of these compounds with acetone yields propylideneaminomethylpyridine zinc dichloride (4) and dibromide (5), respectively. The reaction of ZnI 2  with AMP and acetone gives propylideneaminomethylpyridine zinc dichloride (6) in quantitative yield. The structures of 3, 4, and 6 confirm the linear relationship between the Zn-N distance and the X-Zn-X angle in compounds of the type (L 2 )ZnX 2  with L 2  being a bidentate amino base, whereas short Zn-N bonds enforce small X-Zn-X angles. Compound 2 consists of separated ions in the solid state with a five coordinate zinc atom in a distorted trigonal bipyramidal coordination sphere

zeitschrift für naturforschung b

Synthese, Struktur und Reaktivität von Aminomethylpyridin- zinkdihalogeniden / Synthesis, Structure and Reactivity of Aminomethylpyridine Zinc Dihalides