Semi-empirical study of isocyanate geometries, and β-lactam formation through alkene-isocyanate cyclo-addition reactions
C. I. Williams and M. A. Whitehead
Journal of Molecular Structure: THEOCHEM
Volume 491, Issues 1-3, 19 November 1999, Pages 93-101
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http://dx.doi.org/10.1016/S0166-1280(99)00092-5