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The Pd-catalyzed arylation of cyclam, cyclen, and azacrown ethers by aryl halides was studied. Cofacial biscyclam and bisazacrown were synthesized by direct bonding of the anthracenyl spacer to a nitrogen atom of macrocycles.
Diaminobenzenes are obtained starting from m- and p-dibromobenzenes and secondary amines in the presence of Pd(dba) 2 /P(o-tolyl) 3 and sodium tert-butoxide in moderate to good yields. Reductive dehalogenation of aryl dibromides is a major side reaction under these conditions. The study of this reaction has shown that the formation of reductive dehalogenation products occurs according...
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