RESUMEN
A through-space, seven-bond (1)H-(1)H coupling has been observed in tiliacorinine (1) caused by the close spacial proximity of two aromatic protons that are located in different benzene rings which are separated by two sp(3) carbons. Results from DQF-COSY and NOESY NMR experiments, as well as molecular modeling, reveal that the two protons are unusually close to one another in space.
RESUMEN
Oligo(p-phenylene) rigid rod 10 is synthesized via a functional group-tolerant molecular doubling approach. Preparative chromatographic methods, protecting groups, boronic acid isolations, and Grignard or organolithium reagents are not used. The convenient synthesis of well-defined, polar-functionalized oligophenylene rigid rods could afford ready access to a variety of useful electronic organic materials.
RESUMEN
[structure: see text] Heating aqueous DMSO solutions of five saccharides in the presence of 1-3 reveals that each receptor promotes solution colors characteristic for each sugar. New compound 3 allows the direct correlation of sugar concentration with visible region absorbance and/or fluorescence intensities.