26 Keynotesin Organic Chemistry 3.2 Conformational isomers 32.1 Conformations of ethane(CH.CH, wN2"roemy (v Cbond n eac con atom re The stag conformation is more stable as the CH bonds a ween them (12
2 8A low e front and hack caons 3.2 Conformations of butane (CH.CH.CH.CH, apart 4kJmol)as the two methyl gro gn 入√ 3.2.3 Conformations of cycloalkanes anes isdetermined by
28 Keynotes in Organic Chemistr or below 109.5). N Angle strain H 满 i (elmee 3.2.4 Cyclohexane Cyclohexane adopts the chairor boat conformations.which are both mation is less stabl known as ring-fipping
29 Newman projections H.=equatorial hydrogen (point sideways ) 、一x
Keynotesin Organic Chemistry Br...up 大w cis-1-bromo-2-methylyclohexane m-2mctylcyclhexane 3.3 Configurational isomers The spatial arrangement of atoms or groups in mo lecules is known same moled 3.3.1 Alkenes can have configurational isomer 3.3.1.1 Cisand trans-isomerism H 、 erare asocalled geometric isomers because