Tetrahedron Letters
Volume 40, Issue 10, 5 March 1999, Pages 2001-2004
1,3-Dipolar cycloadditions catalyzed by bis(oxazoline)-magnesium-based chiral complexes. The importance of a Mg(II) counterion.
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http://dx.doi.org/10.1016/S0040-4039(99)00101-X