These different arrangements, resulting from sigma bond rotation, are referred to in organic chemistry as conformations. Web however, in the case of butane there are two different valleys, and two different peaks. The diagram below summarizes the relative energies for the various eclipsed, staggered, and gauche conformations. Web staggered conformer of butane can exist in two forms; Eclipsed conformation is the least stable conformation of butane because the dihedral angle is 0°. Unlike ethane and propane that have only two major conformations, butane has more than two conformers. Test your knowledge on conformations of ethane and butane Web the anti conformation is the most stable conformation of butane as the bulky groups are separated by a dihedral angle of 180°. There are two kinds of staggered conformations. This is the lowest energy conformation for butane.
Clearly, steric strain is lower in the anti. Web one more 60 rotation produces the ‘anti’ conformation, where the two methyl groups are positioned opposite each other and steric repulsion is minimized. In a gauche conformer, the bonds are staggered but the largest groups are 60 0 from each other. Any one specific conformation is called a conformational isomer, or conformer. Web staggered conformer of butane can exist in two forms; In order to better visualize. Web however, in the case of butane there are two different valleys, and two different peaks. In an anti conformer, the largest groups are 180 0 from each other. Web conformations form when butane rotates about one of its single covalent bond. Which is the least stable conformation of butane and why? There are two kinds of staggered conformations.
