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. 2018 May 11;19(14):1733–1745. doi: 10.1002/cphc.201800216

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© 2018 The Authors. Published by Wiley-VCH Verlag GmbH & Co. KGaA.

This is an open access article under the terms of the http://creativecommons.org/licenses/by-nc/4.0/ License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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Scheme 1 — Definition of the carbon species: C_alkyl, C_hetero′, and C₂.