Supporting Information. Synthetic procedures, characterization data for new compounds, summaries of the photoelectrochemical performance of porphyrin-sensitized solar cells, and characterization data for the anatase mesoporous TiO 2 spheres. This material is available free of charge via the Internet at http:// pubs.acs.org.

The palladium-catalyzed oxidative alkynylation of β-borylated porphyrins allows for concise preparation of push-pull structured ethynylbenzoic acid porphyrin derivatives. The resulting β-singly- and doubly-substituted porphyrin dyes are regarded as isomeric derivatives of the corresponding meso-substituted reference systems, and were found to give rise to nearly equal power conversion efficiencies when analyzed in DSSCs.

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