Rod-like guests accommodated in self-assembled coordination nanotubes are shown to stay in the tubes without flipping along its length at room temperature, but rapidly exchange intermolecularly at high temperature.
A novel synthesis of 4-aryl- and 4-heteroarylpyridines via diethyl(4-pyridyl)borane.
作者:MINORU ISHIKURA、TSUKASA OHTA、MASANAO TERASHIMA
DOI:10.1248/cpb.33.4755
日期:——
A convenient method for the preparation of 4-aryl- and 4-heteroarylpyridines by the palladium-catalyzed cross-coupling reaction of diethyl (4-pyridyl) borane with aryl and heteroaryl halides is described.
referred to as cavity-directed synthesis by showing the selective oligomerization of trialkoxysilanes, RSi(OMe)3 (7), in self-assembled hollow compounds. Pd(II)-linked coordination hosts (cage, bowl, or tube) are found to strictly control the oligomerization of 7 (R = 2-naphthyl) in such a way that their optimal guests are produced in their cavities. Thus, within coordination tube 1, one molecule of 7 is