Groups bonded by only a sigma bond can undergo rotation about that bond with respect to each other. the temporary molecular shapes that result from rotation of groups about single bonds are called conformations of a molecule. each ossible structure is called a conformer. An analysis of the energy changes associated with a molecule undergoing rotation about single bonds is called conformational analysis When we do conformational analysis, we will find that certain types of structural formulas are especially convenient to use. One of these types is called a newman projection formula and another ty pe is a sawhorse formula Sawhorse formula are much like other three-dimensional formulas we have used so far In conformational analyses, we will make substantial use of Newman projections• Groups bonded by only a sigma bond can undergo rotation about that bond with respect to each other. The temporary molecular shapes that result from rotation of groups about single bonds are called conformations of a molecule. Each possible structure is called a conformer. An analysis of the energy changes associated with a molecule undergoing rotation about single bonds is called conformational analysis. • When we do conformational analysis, we will find that certain types of structural formulas are especially convenient to use. One of these types is called a Newman projection formula and another type is a sawhorse formula. Sawhorse formula are much like other three-dimensional formulas we have used so far. In conformational analyses, we will make substantial use of Newman projections