[reaction: see text] A synthetic approach toward the immunosuppressants SNF3345 C and SNF4435 D featuring a tandem Stille coupling/electrocyclization cascade is described.
Organics emiconductor materials have recently gained momentum due to their non-toxicity,l ow cost, and sustainability.X ylindein is ar emarkably photostable pigment secreted by fungi that grow on decaying wood, and its relativelys trong electronic performance is enabled by p-p stacking and hydrogen-bonding network that promote charget ransport. Herein, femtosecondt ransienta bsorption spectroscopy with an ear-IRp robe was used to unveil ar apid excited-state intramolecular protont ransfer reaction. Conformational motions potentially lead to a conical intersection that quenches fluorescence in the monomeric state. In concentrated solutions, nascent aggregates exhibit af aster excited state lifetime due to excimer formation, confirmed by the excimer!charge-transfer excited-state absorption band of the xylindein thin film, thus limiting its optoelectronic performance. Therefore, extending the xylindein sidechains with branched alkyl groups mayh indert he excimer formation and improve optoelectronic properties of naturally derived materials.
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