No abstract

The scope and limitations of the dehalogenation of aromatic halides 1 and 4a-p using metallic calcium in ethanol at room temperature were revealed. The cleavage of the carbon-chlorine bond on the aromatic ring bearing electron-donating group was difficult compared to the one bearing electron-withdrawing group. Moreover, we applied this method to the dechlorination of polychlorinated biphenyls (PCBs) in transformer oil. It was also found that the dechlorination took place easily under mild conditions. The existence of PCBs residue in the reaction at room temperature was less than 0.04% according to the GC-MS analysis. The chlorine was identified as calcium chloride.

The reduction of carbonyl compounds 1a-h using Ni-Al alloy in water under reflux proceeded to give the corresponding methylene compounds 2a-h within 2 h in 89.0-99.8% relative yields.

SUMMARYBen~yl-a,a-~H2-amine, 2-2H1-Benzyl-a,a-2H2-amine, 3-2H1-Benzyl-a,a-2H2-amine, 4-2H1-Benzyl-a,a-2Hz-amine, 2,5-2H~-Benzyl-a,a-2H2-amine, and phenethyl-a,a,P,P-2H4-amine were prepared in high isotopic purities from the corresponding benzonitrile, bromobenzonitriles, and phenylacetonimle by reduction with Raney Cu-A1 alloy in an alkaline deuterium oxide solution.