1.Conformational isomers These conformers can be superimposed by a simple roation along one ore more single bonds within the molecule.It should be noted,however,that conformers have usually different physico-chemical stabilities because of disturbances between two or several groups in space.A good example in this respect is butan. CH3 CH3 CH3 CH3 CH3 Anomeric forms,i.e.the axial or equatorial orientation of atoms or groups in ring systems(a-or B-glucose for example)does also belong to the group of conform- ational isomers. 1. Conformational isomers These conformers can be superimposed by a simple roation along one ore more single bonds within the molecule. It should be noted, however, that conformers have usually different physico-chemical stabilities because of disturbances between two or several groups in space. A good example in this respect is butan. CH3 H H CH3 H H CH3 H H H H CH3 Anomeric forms, i.e. the axial or equatorial orientation of atoms or groups in ring systems (a- or b- glucose for example) does also belong to the group of conform￾ational isomers. CH3 CH2 CH2 CH3