Synthesis of a Series of Tropone-Fused Porphyrinoids
作者:Emma K. Cramer、Timothy D. Lash
DOI:10.1021/acs.joc.1c02063
日期:2022.1.21
greatly altered, showing shifts to longer wavelengths and the appearance of strong Q bands between 600 and 800 nm. The proton nuclearmagneticresonance spectra were also very unusual, as the internal protons were strongly shifted upfield, in some cases giving rise to resonances that approached −10 ppm. However, the external protons showed reduced downfield shifts compared to porphyrinoids that do not