期刊
MICROPOROUS AND MESOPOROUS MATERIALS
卷 148, 期 1, 页码 166-173出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.micromeso.2011.08.010
关键词
Alkyne; Homocoupling; Palladium; SBA-15; Suzuki coupling
类别
资金
- Chinese Ministry of Education [108119]
- Natural Science Foundation of China [20875041]
- Program for New Century Excellent Talents in University [NCET-08-0255]
A mesoporous silica SBA-15-supported palladium with spindle-like nitrogen donor groups, 1, 4-diaza-bicyclo[2.2.2]octane, has been successfully prepared and applied for homocoupling of terminal alkynes. The catalyst exhibited very high activity for terminal alkynes carrying various substitution groups, yields ranging from 70% to 94%, with a significant advantage that air acted as the oxidant. It also showed good reusability, could be easily recovered through filtration and washing, and reused at least five times with virtually no evident loss of catalytic performance. Furthermore, it was also proved to be an effective and air-stable heterogeneous catalyst for Suzuki coupling of aryl halides (X = I. Br) with arylboronic acids. The catalyst was systematically characterized by elemental analysis, X-ray photoelectron spectroscopy, high-resolution transmission electron microscope, nitrogen physical adsorption, Brunauer-Emmett-Teller method and X-ray powder diffraction. The analyses indicated that the mesoporous structure of the materials was retained during the immobilization process. (C) 2011 Elsevier Inc. All rights reserved.
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