−CH3>−CHR2>−CH2R>−CR3-\mathrm{CH}_{3}>{ }^{-} \mathrm{CHR}_{2}>{ }^{-} \mathrm{CH}_{2} \mathrm{R}>{ }^{-} \mathrm{CR}_{3}−CH3>−CHR2>−CH2R>−CR3
−CH3>−CH2R>−−CHR2>−−CR3-\mathrm{CH}_{3}>-\mathrm{CH}_{2} \mathrm{R}>-{ }^{-} \mathrm{CHR}_{2}>-{ }^{-} \mathrm{CR}_{3}−CH3>−CH2R>−−CHR2>−−CR3
−CR3>−−CH2R>−−CHR2>−−CH3-\mathrm{CR}_{3}>-{ }^{-} \mathrm{CH}_{2} \mathrm{R}>-{ }^{-} \mathrm{CHR}_{2}>-{ }^{-} \mathrm{CH}_{3}−CR3>−−CH2R>−−CHR2>−−CH3
−CR3>−CHR2>−CH2R>−CH3{ }^{-} \mathrm{CR}_{3}>{ }^{-} \mathrm{CHR}_{2}>{ }^{-} \mathrm{CH}_{2} \mathrm{R}>{ }^{-} \mathrm{CH}_{3}−CR3>−CHR2>−CH2R>−CH3