✍ Scribed by Joel M. Kauffman; Guillermo Moyna
No coin nor oath required. For personal study only.
In the quest for fast fluors for use in waveshifting polystyrene fibers, symmetrical oligofurans were investigated. Furan moieties were coupled by means of the Ullmann Reaction or by palladium‐catalyzed unsym‐metrical coupling; the latter gave higher yields. While the benzoxazole‐terminated quater‐ and quinquifurans we prepared were both stable and fast, exhibiting a green fluorescence and decay times of about 2.4 nsec, they were inferior to other types of fluors in solubility and emission intensity when incorporated into polystyrene.
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## Abstract 2‐(2‐Amino‐3,4,5,6‐tetrafluorophenyl)benzoxazole (**2**) absorbs in long wavelength band (λ~abs~^max^ = 346 nm in methanol) and in the normal wavelength band (λ~abs~^max^ = 285.5 nm), and emits blue fluorescence. The emission intensity is highly affected by the solvent polarity and is l