Ring closure reactionsRing closure reactions O 0130 Zirconium-Catalyzed Enantioselective Hydroamination/Cyclization. -A chiral zirconium alkyl cation catalyzes the cyclization of certain aminoalkenes with enantioselectivities up to 82%, the highest thus observed so far for such a process. -(KNIGHT, P. D.; MUNSLOW, I.; O'SHAUGHNESSY, P. N.; SCOTT*, P.; Chem. Commun. (Cambridge) 2004, 7, 894-895; Dep. Chem., Univ. Warwick, Coventry CV4 7AL, UK; Eng.) -M. Paetzel 33-046
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