854669-22-0Relevant academic research and scientific papers
Azacalix[4]arene cation radicals: Spin-delocalised doublet- and triplet-ground states observed in the macrocyclic m-phenylene system connected with nitrogen atoms
Ishibashi, Koichi,Tsue, Hirohito,Sakai, Naoko,Tokita, Satoshi,Matsui, Kazuhiro,Yamauchi, Jun,Tamura, Rui
supporting information; body text, p. 2812 - 2814 (2009/02/05)
Electron paramagnetic resonance spectroscopy has unmasked for the first time the spin-delocalised doublet- and triplet-ground states of azacalix[4]arene cation radicals. The Royal Society of Chemistry.
Regioselectively N-methylated azacalix[8]arene octamethyl ether prepared by catalytic aryl amination reaction using a temporal N-silylation protocol
Ishibashi, Koichi,Tsue, Hirohito,Tokita, Satoshi,Matsui, Kazuhiro,Takahashi, Hiroki,Tamura, Rui
, p. 5991 - 5994 (2007/10/03)
(Chemical Equation Presented) A temporal N-silylation protocol in the catalytic aryl amination reaction has been devised to prepare nitrogen-bridged calixarene analogues. The protocol involves a smooth in situ N-silylation before aryl amination reaction, followed by spontaneous cleavage of the N-Si bond in the usual workup process, to furnish secondary aromatic amines as the cross-coupled product with no silyl group on the nitrogen atom. A successful application to the preparation of regioselectively N-methylated azacalix[8]arene is described, together with the crystallographic analysis.
Exhaustively methylated azacalix[4]arene: Preparation, conformation, and crystal structure with exclusively CH/π-controlled crystal architecture
Tsue, Hirohito,Ishibashi, Koichi,Takahashi, Hiroki,Tamura, Rui
, p. 2165 - 2168 (2007/10/03)
(Chemical Equation Presented) Described are the preparation, conformation, and crystal structure of exhaustively methylated azacalix[4]arene involving nitrogen atoms as bridging units. NMR and X-ray crystallographic analysis have demonstrated that this no
