Order of prefixes, alphabetical

Rule 4. Name the side chains by approved radical names and precede these with the correct position numbers. For the acyclics, the complexity order and the alphabetical order of prefixes will be identical, since only methyl and methylene side chains are involved — for example, 2,6-dimethyl in geraniolene (Nos. 1A and IB, Chart 3) and 7-methyl-3-methylene in myrcene (No. 2, Chart 3). 

British and American cooperation has reduced to some extent differences in practice in these two English-speaking countries. The British have adopted many of the CA practices, including alphabetic order of prefixes. One of the differences has been in the use of italicized prefixes. The British have italicized many more prefixes than have the Americans. This means a different placement of such names in indexes, since italicized prefixes are not considered in alphabetizing. American and British cooperation has been extended and some of these differences have been eliminated. Thus the British no longer italicize bicyclo-, cyclo-, epi-, iso-, seco-, and spiro- (17). 

The British have adopted, from American practice, the alphabetical order of prefixes have reconsidered part of the organophosphorus nomenclature in order to open the way to agreement in that field and will make the many changes demanded by the 1949 IUPAC organic rules when these reach final form. 

It is important to note that multiplying prefixes have no influence on the alphabetical order of prefixes. The names of substituted substituents are alphabetized as a whole otherwise such substituent groups are subject to the same rules as are applied to parent structures, with two exceptions a) even high-ranked characteristic groups are expressed as suffixes here and b) the linking position (free valence) has the lowest possible locant within the limitations put forth in Section 6.4. For chain substituents this is traditionally always locant 1. 

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