An Introduction to Chemical Nomenclature by R. S. Cahn M.A., Dr. Phil. nat., F.R.I.C. (auth.)

By R. S. Cahn M.A., Dr. Phil. nat., F.R.I.C. (auth.)

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Similarly prefixes which have varied use are not italicized when in particular cases they refer to stereoisomers, as in allocinnamic acid, for here they do not define a particular stereoisomer. American practice. , m-Xylene, cis-Stilbene). Alphabetical order Prefixes are arranged in alphabetical order, any multiplying parts of simple prefixes being neglected for this purpose. The atoms and groups are alphabeticized first and the multiplying prefixes are then inserted, as in: o- bromochlorobenzene 4-ethyl-3- methyldecane 1,1,1-trichloro-3,3-dimethylpentane A complex radical forms one suffix; it is therefore alphabeticized under its first letter, as in: 1-dimethylamino-3-ethyl-4-methylamino2-naphthoic acid 4-chloro-1 ,5-bisdimethylamino-3-ethyl2-naphthoic acid For otherwise identical prefixes the one with the lowest locant at the first cited point of difference is given first, as in: 1-(2-ethyl-3-methylpentyl )-8- (2-ethyl4-methylpentyl)naphthalene When two words fill identical functions in a threeword name they are alphabeticized, as in: ethyl methyl ketone butyl ethyl ether Italics are neglected in alphabeticizing, as in: 3-trans- but-2'-enyl-2-ethylphenol Elision IUPAC has recently legislated for elision of vowels 37 INTRODUCTION TO CHEMICAL NOMENCLATURE in names, there having been considerable variation in national habits.

D) When an organic compound which is not normally named as an acid forms a ligand by loss of a proton, it is treated as anionic and its name is given the ending -ato. ) (e) For computation of the oxidation number, 27 INTRODUCTION TO CHEMICAL NOMENCLATURE NO, NS, CO, and CS are treated as neutral; hydrocarbon radicals are counted as negative (to avoid unusual results). After these explanations the following examples will, it is hoped, be self-explanatory and sufficiently illustrate the principles: [CoNs(NHs)s]S04 penta-ammineazidocobalt(m) sulphate [CoCl(NHs)s]Cla penta-amminechlorocobalt(m) chloride [Co(NHa)a{NHs)4]0CaHs diamidotetra- amminecobalt(m) ethanolate [Ru(HSOs)a{NHs)4] tetra-amminebis(hydrogen sulphito )ruthenium(rr) Ka[Cr(O)aOa(CN)a(NHs)] potassium amminedicyanodioxoperoxochromate(VI) Na[BH{OCH3 ) 3 ] sodium hydridotrimethoxoborate Ka[Fea8a(N0)4] dipotassium tetranitrosyldithio~ diferrate [CuCla(CHs·NHa)a] dichlorodi(methylamine)copper(rr) [Ft PY«][FtC14] tetrapyridineplatinum(rr) tetrachloroplatinate(rr) [FtCl2(HaN·CH2·CH(NHa)•CH2·NHs)]Cl dichloro2,3-diaminopropylammoniumplatinum(rr) chloride [Ni{C~70aN 2)2] bis(butane-2,3-dionedioximato )nickel(rr) [CoCl2{C4HsOaN 2)] bis(butane-2,3-dionedioxime)dichlorocobalt{rr) Na2[Fe(CN)sNO] disodium pentacyanonitrosylferrate 28 INORGANIO HCo(C0)4 hydrogen tetracarbonylcobaltate( -I) or tetracarbonylhydridocobalt(I) Fe 2(CO)g enneacarbonyldi-iron H 2[Fe(C0) 4] dihydrogen tetracarbonylferrate [Ni(C0)2(Ph 3P)2] dicarbonylbis(triphenylphosphinenickel( 0) K[SbClsC6Hs] potassium pentachloro(phenyl)antimonate(v) K2[Cu(C2H) 3 ] potassium triethynylcuprate(I) Fe(CsHs)2 bis(cyclopentadienyl)iron(rr) [Fe(CsHs)2]Cl bis(cyclopentadienyl)iron(m) chloride Cr(C6H6)2 dibenzenechromium The handling of carbonyl derivatives in the examples will be noted: names such as di-iron enneacarbonyl (with its "irregular" final -yl ending) and iron carbonyl hydride or iron tetracarbonyl dihydride can well be spared.

Prefixes may be used with these, as with acids. The "-yl" principle is noted in the rules as not extensible to other metal-oxygen radicals. , UO~+ uranyl(VI) or uranyl(2 + ), uo; uranyl(v) or uranyl(l + ). 3 23 INTRODUCTION TO CHEMICAL NOMENCLATURE Table 3, HO co NO NOa PO SO SOa SaOo SPECIAL INORGANIC RADICAL NAMES hydroxyl carbonyl nitrosyl nitryl phosphoryl sulphinyl (thionyl) sulphonyl (sulphuryl) disulphuryl SeO SeOa Cr02 UOa PuOa CIO CIOa ClOa seleninyl selenonyl chromyl uranyl plutonyl* chlorosylt chlorylt perchlorylt • Slmllarly for other actinides.

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