ACD/Name (Chemist Version) offers a standardized set of features for quick and simple generation of IUPAC names, and structures from names. It is a streamlined version of our popular ACD/Name software.
View a full description and pricing on our web store.
In the above example, the "indicated hydrogen" locates two hydrogen atoms at position 3 (an "extra" hydrogen over the number present if there were a double bond in the ring at that position), thus specifying a particular pyrrole tautomer, as illustrated. Indicated hydrogen of this type normally precedes the name of a parent hydride.
Example to R-1.3
A second type of indicated hydrogen (sometimes referred to as "added hydrogen") describes hydrogen atoms added to a specified structure as a consequence of the addition of a suffix or a prefix describing a structural modification. This type of indicated hydrogen is normally cited in parentheses after the locant of the additional structural feature.
Published with permission of the IUPAC by Advanced Chemistry Development, Inc., www.acdlabs.com, +1(416)368-3435 tel, +1(416)368-5596 fax. For comments or suggestions please contact email@example.com