Figure 3. Reaction Scheme 1. The 2s NECA basic organic reaction scheme, which is ordered by periodic table connections and oxidation levels (OLs). Groups and VIA indicate the position of the most specific (hetero) atom of a functional group in the periodic table. R1, R2, R3 and R4 are used to enumerate the R groups or to denote hydrogen. The numbers 1) and 2) next to a reagent indicate consecutive reactions . (Reproduced with permission The Chemical Educator, http://chemeducator.org.)

From

A Hierarchical Structure for an Organic Chemistry Course

Jef Struyf

World Journal of Chemical Education. 2015, 3(2), 51-58 doi:10.12691/wjce-3-2-5