S2O2Iph 1a was synthesized by the previously reported procedure. All other chemicals were of reagent grade and used without further purification unless otherwise noted. Analytical thin-layer chromatography (TLC) was performed on silica gel 60 F254 plates (Merck). Column chromatography was performed using silica gel 60N (Kanto Chemical, spherical, neutral, 63-210 μm). All NMR spectral data were recorded on a JEOL ECA-500 (500 MHz), JEOL ECS-400 (400 MHz), and Bruker AVANCE NEO (700 MHz) spectrometers at ambient temperature (25 °C). H NMR spectra were referenced internally to tetramethylsilane as a standard. C NMR spectra were referenced internally to a solvent signal (δ = 77.0 and 29.8 ppm for CDCl3 and [D6]acetone, respectively). High-resolution electrospray ionization mass spectrometry (ESI HRMS) data were obtained using a Thermo Fisher Scientific Q-Exactive mass spectrometer. MALDI-TOF MS data were obtained using a SHIMADZU KRATOS AXIMA-PERFORMANCE mass spectrometer. UV-vis/NIR spectral data were recorded on a HITACHI U-4100 spectrometer. Melting points were determined using a Yanaco MP-S3 melting point apparatus.