By R. S. Cahn M.A., Dr. Phil. nat., F.R.I.C. (auth.)
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Extra info for An Introduction to Chemical Nomenclature
III, 1914-15, pp. 2224. , CAPELL, L. , and WALKER, D. , 1960; and supplements. C. Compt68 rendus of the lOth Conference, 1930, pp. 57-64. 8 IUPAC Comptes rendus of the 15th Conference, 1949, pp. 127-186; 16th Conference, 1951, pp. 100-104; 18th Conference, 1955, pp. 120-184. 9 IUPAC Nomenclature of Organic Chemistry, 1957, Section A. Hydrocarbons, Section B. Fundamental Heterocyclic Systems. , 1966. 10 IUPAC Nomenclature of Organic Chemistry, 1965. Section C. Characteristic Groups Containing Carbon, Hydrogen, Oxygen, Nitrogen, Halogen, Sulfur, Selenium, andjor Tellurium, Butterworths, London, 1965.
CO ranks before OH, so that we write 2-hydroxycyclohexanone and not 2-oxocyclohexanol; in the same way OH ranks before NH2, so that p- HO·C6H 4 •NH2 is p-aminophenol and not p-hydroxyaniline (an example which shows that the seniority order applies even to semitrivial names). , the group is considered to replace hydrogen, as in CHs·CHs ethane ~ CHs•CH2·0H ethanol, or CoHo benzene~ C0H 5Cl chlorobenzene. When the carbon atom of a group in Table 4 is in parentheses, that atom is not added by the suffix, as when CoH13·CH3 heptane gives CoH13•C02H heptanoic acid; when the same group is also listed without parentheses, then the prefix or suffix does add that carbon atom, as in C9H~ quinoline ~ 8-C9H 8N •C0 2H quinoline-8-carboxylic acid, or (CaH7)2CH2 heptane ~ (H02C•CH2•CH2·CH2)2CH· C0 2H 1,4, 7- triheptane-carboxylic acid.
Hydrogen carbonate ion. (b) Double salts, etc. A somewhat complex set of IUPAC rules published in 1957 was much simplified in 1965 by extensive use of the alphabetical order. , all the cations are now to be cited first, in alphabetical order, except that H+ is named last. Then all the anions are listed, these also in their alphabetical order. Water considered to be co-ordinately bound to a specific ion is cited as aqua- (note the change from aquo- that was customary before 1965). Numerical prefixes can be omitted if the valencies are constant or stated.