A Pd/P(t-Bu)(3) catalyst system has revealed very high activity and selectivity for the amination of N-(hetero)aryl halides with unprotected piperazine. A wide variety of N-(hetero)arylpiperazines could be prepared using this catalyst. Turnover numbers up to 6400mol/mol have been obtained. (C) 1998 Elsevier Science Ltd. All rights reserved.
Tunable Functionalization of Saturated C–C and C–H Bonds of <i>N,N′</i>-Diarylpiperazines Enabled by <i>tert</i>-Butyl Nitrite (TBN) and NaNO<sub>2</sub> Systems
A tunable functionalization of saturated C–C and C–H bonds of N,N′-diarylpiperazine derivatives was realized by tert-butyl nitrite (TBN) and NaNO2 systems, respectively. When TBN was employed as the oxidant, C–C bond cleavage occurred smoothly, providing a series of formamides in good yields. In the presence of NaNO2, C–H oxidation was achieved, resulting in efficient synthesis of nitroalkenes. The
Piperazine: a promising building block for aggregation-induced emission materials
作者:Tuokai Peng、Hui-Qing Peng
DOI:10.1039/d3tc02573j
日期:——
as a promising buildingblock for the construction of aggregation-induced emission (AIE) materials by using its electron-donating ability and chair conformation. The piperazine derivatives can realize the suppression of twisted intramolecular charge transfer and nonradiative decay during aggregation and thus exhibit AIE features. PA-Py+ is successfully designed as a new AIE material for photodynamic