Isotopomers

Isotopomers or isotopic isomers are isomers with isotopic atoms, having the same number of each isotope of each element but differing in their positions. The result is that the molecules are either constitutional isomers or stereoisomers solely based on isotopic location. For example, CH₃CHDCH₃ and CH₃CH₂CH₂D are a pair of constitutional isotopomers of propane. (R)- and (S)-CH₃CHDOH or (Z)- and (E)-CH₃CH=CHD are examples of isotopic stereoisomers of ethanol and of propene, respectively.