Multiple prefixes, hyphenation

The stoichiometric name of the compound is then formed by combining the name of the electropositive constituent, cited first, with that of the electronegative constituent, both suitably qualified by any necessary multiplicative prefixes ( mono , di , tri , tetra , penta , etc., given in Table IV). The multiplicative prefixes precede the names they multiply, and are joined directly to them without spaces or hyphens. The final vowels of multiplicative prefixes should not be elided (although monoxide , rather than monooxide , is an allowed exception because of general usage). The two parts of the name are separated by a space in English. 

In bridged dinuclear species, bridging ligands are indicated by the Greek letter p, placed before the ligand name and separated from it by a hyphen. The whole term, e.g. p-chlorido , is separated from the rest of the name by hyphens. If the bridging ligand occurs more than once, multiplicative prefixes are employed (see also Sections IR-9.1.2.10 and IR-9.2.5.2). 

Hyphens, on the other hand, are used less in USA than in British practice (see p. 38). Identical letters belonging to different words are not separated by hyphens in USA (methyllithium, tetraacetate) hyphens are not used in words such as coordinate, unionized, nor to join portions/ of partial names (keto ester, amino acid), nor after voiced vowels ending isolated parts of nomenclature (thia compound, methoxy group, amino derivative). They are also not used between a multiplicative prefix and a parenthesis, e.g.j in USA it is correct to write p-bis(2 -chloroethyl)-benzene in Great Britain the name would start p-di-(2-... or p-bis-(2-... on the grounds that parentheses do not alter pre-existing punctuation. 

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