“…There are bound to be further applications of these key ideas. Recent applications include (a) a wide spectrum (with regard to sugar structure) fluorescent sensor for high sugar concentrations common in the food and beverage industry, and (b) competition betwen PET and excimer−monomer equilibria 516 (section IX) which may allow sugar assay with self-calibration as in 120 475,476 and 129 . ,, …”
Section: A “Off−on” and “On−off”
Switchesmentioning
“…There are bound to be further applications of these key ideas. Recent applications include (a) a wide spectrum (with regard to sugar structure) fluorescent sensor for high sugar concentrations common in the food and beverage industry, and (b) competition betwen PET and excimer−monomer equilibria 516 (section IX) which may allow sugar assay with self-calibration as in 120 475,476 and 129 . ,, …”
Section: A “Off−on” and “On−off”
Switchesmentioning
“…Elemental analysis was believed to be thworted by ease of dehydration. 9,11 General procedure for the coupling reaction: A mixture of phenyl-1,4-diboronic acid or ester (0.2 mmol), 4-BrBCB (85 mg, 0.46 mmol), TBAB (0.02 mmol) and PdCl 2 (0.016 mmol) in 10 ml of ethanol was stirred for 30-60 min under N 2 at room temperature. 29.52, 121.46, 122.84, 126.05, 127.29, 127.68, 139.25, 139.84, 141.32, 145.11, 146.35…”
An efficient and practical preparation of the bisbenzocyclobutene monomers has been developed via the room temperature Suzuki couplings of phenyl-1, 4-diboronic ester with 4-bromobenzocyclobutene or benzocyclobutene-4-boronic acid with aryl dibromides.
Mit mehr als 400‐facher Selektivität wird Glucose gegenüber Galactose, Mannose und Fructose von einem Rezeptor erkannt, der mit dem Computerprogramm CAVEAT entworfen wurde. Dabei wurden die Boronsäurereste so positioniert, dass die Bildung cyclischer Boronate mit den Hydroxygruppen an den 1,2‐ sowie 4,6‐Positionen von α‐D‐Glucopyranose sehr leicht verläuft (siehe Bild). Die Fluoreszenz des Rezeptors nimmt nach Bindung von Glucose um 50 % ab.
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