Preferred Label : indicated hydrogen;
IUPAC definition : Under certain circumstances it is necessary to indicate in the name of a ring, or
ring system, containing the maximum number of non-cumulative double bonds, one or
more positions where no multiple bond is attached. This is done by specifying the
presence of an 'extra' hydrogen atom at such positions by citation of the appropriate
numbered locant followed by an italicized capital i H /i . Example: A second type
of indicated hydrogen (sometimes referred to as 'added hydrogen') describes hydrogen
atoms added to a specific 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 feature. Example:;
Origin ID : I03004;
See also
Under certain circumstances it is necessary to indicate in the name of a ring, or
ring system, containing the maximum number of non-cumulative double bonds, one or
more positions where no multiple bond is attached. This is done by specifying the
presence of an 'extra' hydrogen atom at such positions by citation of the appropriate
numbered locant followed by an italicized capital i H /i . Example: A second type
of indicated hydrogen (sometimes referred to as 'added hydrogen') describes hydrogen
atoms added to a specific 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 feature. Example:
