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Several different methods have been utilized in an effort to allow for the effective the effective synthesis of a new class of porphyrins, bearing the synthetically intriguing propadienyl (or allenyl) functional group. Of these, successive HWE couplings proved impossible, but Pd-catalyzed cross couplings enabled quick and easy synthetic access to allenylporphyrins. Suzuki-Miyaura cross coupling conditions of bromoporphyrins with allenylboronic acid pinacol ester were optimized and represent thedoi:10.1002/ejoc.201201535 fatcat:ddjmjghuefagtfobny53rnkpsi