报告题目：Regioselective Bis-Additions toEmpty and Endohedral Clusterfullerenes: External Tetheror Internal Cluster Control?
报告人：Prof. Luis Echegoyen
University ofTexas at El Paso, 500 W Univ. Ave., CCSB#2.0304, El Paso, TX 79968
报告时间：2016年5月3日（星期二）上午10:00-11:00
报告地点：苏州大学独墅湖校区907楼1101室
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Abstract:
Several strategies have beenutilized to control the regiochemistry of multiple additions on fullerenecages, most notable being the tether-directed-remote functionalization method,originally introduced by Diederich et al. In this method, two reactive centers,separated by a rationally designed tether (preferably rigid and with theappropriate length to guide the bis-additionregioselectively) are attached to the fullerene cages, see structures at theleft. This strategy works well with C60 and to some degree with C70,but surprisingly it fails completely when applied to endohedralclusterfullerenes, such as Sc3N@C80. In these cases onlyone reactive center leads to a fullerene adduct while the other remainsunattached. These observations are interesting because independent bis-adducts (non-tethered) are easilyformed without difficulty, see structure at the right. More interestingly, thenumber of bis-adduct regioisomersthat form is very limited, indicating that the cluster inside must play animportant role in directing the exohedral additions. These results will bepresented and discussed in detail.
Biography: Luis Echegoyen is a professor ofChemistry at the University of Texas at El Paso since August, 2010 and wasawarded The Robert A. Welch Chair for Chemistry. He was the Director of theChemistry Division at the National Science Foundation from August, 2006 untilAugust, 2010, where he was instrumental in establishing new funding programsand research centers. He served as Chair for the Department of Chemistry from2002 until his NSF appointment. Prof. Luis Echegoyen has published around 300research articles and 40 book chapters. He was elected Fellow of the AmericanAssociation for the Advancement of Science in 2003 and has been the recipient of manyawards, including the1996 Florida ACS Award and the 2007 Herty Medal Award from the ACS GeorgiaSection.
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