Sources, classification flowchart

The best electron sources are electron rich, like anions and lone pairs, such that no bonds need be broken to use them as electron sources. Other excellent electron sources are highly ionic sigma bonds and pi bonds polarized by excellent electron-releasing groups. Table 5.2 repeated below shows the common electron sources, and Figure A.l shows a flowchart of the classification process. 

Electron sinks have a full, partial, or inducible plus charge on the atom that gets attacked by the electron source. The larger the partial plus is, the better the electron sink can attract a negatively charged electron source. Table 6.2 repeated below gives the common electron sinks, and Figure A.l shows a flowchart of the classification process. 

Figure A.l Flowcharts for the classification of electron sources and sinks.

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