p<i>K</i><sub>a</sub> Values and Geometries of Secondary and Tertiary Amines Complexed to Boronic AcidsImplications for Sensor Design
作者:Sheryl L. Wiskur、John J. Lavigne、Hassan Ait-Haddou、Vincent Lynch、Yu Hung Chiu、James W. Canary、Eric V. Anslyn
DOI:10.1021/ol0156805
日期:2001.5.1
[structure in text] The pK(a) values and the geometries of secondary and tertiary amines adjacent to boronic acids were determined using potentiometric and (11)B NMR titrations. The studies showed that the secondary ammonium ion has a pK(a) similar to that of the tertiary ammonium species, which leads to the formation of tetrahedral boron centers at pH values above approximately 5.5. Therefore, secondary