Alkyl cyanides definition

In Table A.l the chemical environment of each bond is normally defined by a linear formulation of the substructure. The target bond is set in bold type, e.g. Cgr-C N (aryl cyanides) C-CH2-0-Cgr (primary alkyl aryl ethers) (C-0)2-P( = 0)2 (phosphate diesters). Occasionally the chemical numbering of a functional group or ring system is used to define bond environment, e.g. in naphthalene, C(2)-C(3) in imidazole N1-C2. To avoid any possible ambiguity in these cases, we include numbered chemical diagrams in Figure A.4. A combination of chemical name and linear formulation is often employed to increase the precision of the definition, e.g. NH2-C=0 in acyclic amides C = C-C( = 0)-C(=0) in benzoquinones. Finally, for very simple ions the accepted conventional representation is deemed to be sufficient, e.g. in N03, S04, etc. 

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