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atoms as spheres with arbitrary radii. Fig. 7: Bond lengths (in Å) of the single and double bonds of the butadiene structural elements in compounds 1k , 1l , and 1g (unreactive in [2+2] cycloadditions; left, red color) and 1d , 1c , and 1b (reactive in [2+2] cycloadditions; right, blue color) resulting from single-crystal structure determinations. Product 2a reacted with ammonium acetate upon heating in methanol for several hours to give a mixture of dimethyl 2-phenylpyridine-3,6-dicarboxylate ( 3 ) and methyl 3-amino-3-phenylacrylate ( 4 ). Because the