ring isomerism

ring isomerism

[′riŋ ī′säm·ə‚riz·əm]
(organic chemistry)
A type of geometrical isomerism in which bond lengths and bond angles prevent the existence of the trans structure if substituents are attached to alkenic carbons which are part of a cyclic system, the ring of which contains fewer than eight members; for example, 1,2-dichlorocyclohexene.