52 CONFORMATIONS OF ALKANES AND CYCLOALKANES 3. 19 All the staggered conformations about the C-2--C-3 bond of 2, 2-dimethylpropane are equivalent to one another and of equal energy; they represent potential energy minima. All the eclipsed confor mations are equivalent and represent potential energy maxima. CH3 HC个CH H CH H H一H CH CH H3C TCH H,CCH, H,CTCH3 H H H Torsion angle(degrees) The shape of the potential energy profile for internal rotation in 2, 2-dimethylpropan ne more closely resembles that of ethane than that of butane. 3.20 The potential energy diagram of 2-methylbutane more closely resembles that of butane than that of propane in that the three staggered forms are not all of the same energy. Similarly, not all of the eclipsed forms are of equal energy H HC一CH3H3CH HCH H-h H-TH H H C-H H H3 H3 120180240300360 Torsion angle(degrees) Back Forward Main Menu TOC Study Guide Toc Student OLC MHHE Website3.19 All the staggered conformations about the C-2GC-3 bond of 2,2-dimethylpropane are equivalent to one another and of equal energy; they represent potential energy minima. All the eclipsed confor￾mations are equivalent and represent potential energy maxima. The shape of the potential energy profile for internal rotation in 2,2-dimethylpropane more closely resembles that of ethane than that of butane. 3.20 The potential energy diagram of 2-methylbutane more closely resembles that of butane than that of propane in that the three staggered forms are not all of the same energy. Similarly, not all of the eclipsed forms are of equal energy. Potential energy 0 60 120 180 240 300 360 Torsion angle (degrees) H3C CH3 H H H CH3 H3C H H H H3C CH3 H CH3 H H H3C CH3 CH3 H H H3C H CH3 CH3 H H H3C CH3 H CH3 H H H CH3 CH3 Potential energy 0 60 120 180 240 300 360 Torsion angle (degrees) H H H3C CH3 H CH3 H H H3C CH3 CH3 H H H H3C CH3 CH3 H H H CH3 H3C CH3 H CH3 H3C CH3 H H H CH3 H3C CH3 H H H CH3 H3C CH3 H H H 52 CONFORMATIONS OF ALKANES AND CYCLOALKANES Back Forward Main Menu TOC Study Guide TOC Student OLC MHHE Website