haems
halirenium ions
haloforms
halohydrins
halonium ions
helicenes
hemes and heme derivatives
hemiacetals
hemiaminals
hemiketals
hemins
hemochromes
hemoglobins
Herz compounds
hetarenes
hetaryl groups
hetarynes
heteroalkenes
heteroarenes
heteroaryl groups
heteroarynes
heterocumulenes
heterocyclic compounds
heterocyclyl groups
homocyclic compounds
hydrazides
hydrazide hydrazones
hydrazide imides
hydrazidines
hydrazines
hydrazinylidenes
hydrazo compounds
hydrazones
hydrazonic acids
hydrocarbons
hydrocarbyl groups
hydrocarbylene groups
hydrocarbylidene groups
hydrocarbylidyne groups
hydrocarbylsulfanyl nitrenes
hydroperoxides
hydropolysulfides
hydrosulfides
hydroxamic acids
hydroximic acids
hydroxylamines