https://doi.org/10.1351/goldbook.A00227
- An old term, which is not recommended, for @A00224@, especially those of low @M04000@.
- An old term for alkanediyl groups commonly but not necessarily having the free valencies on adjacent carbon atoms, e.g. –CH(CH3)CH2– propylene (systematically called propane-1,2-diyl).