The addition reaction of ynamines with active multibonds provides a versatile tool in the syntheses of amine derivatives. l N, N-Dialkyl (alkyl or phenylethynyl) amine reacts with dimethyl acetylenedicarboxylate2 or benzyne3 in 1: 2 mole ratio to give an aniline derivative or a mixture of phenanthrene and anthracene derivatives. These 1: 2 addition products may be formed via dipolar intermediates reactive enough to add to another mole of the active ...
