R. K. Hill and Tak-Hang Chan. Magnetic non-equivalence of methylene protons in dissymmetric benzylamines *1: A simple method of assignment of configuration to identically α,α′-disubstituted heterocyclic bases. Tetrahedron. 1965. 21. 8. 2015-2019.
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http://dx.doi.org/10.1016/S0040-4020(01)98340-1