isomerism e Conformational isomers they can be interconverted by rotation about one or more sigma-bonds the interconversion are so rapid that we cannot separate them Staggered Eclipsed H H H H H H H H H H Newman projection sawhorse projection Newman projection sawhorse projectionIsomerism Conformational isomers ---- they can be interconverted by rotation about one or more sigma-bonds ---- the interconversion are so rapid that we cannot separate them H H H H H H H H H H H H Staggered Newman projection sawhorse projection 600 H H H H H H H H H H H H Eclipsed 0 0 Newman projection sawhorse projection