Représentationspatiale,desmolécules,

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esmoléculesayantlamêmeformulesemi- ndesmoléculesIlexistelesformulebrute,semi- ationdeCram2,2- isonsestde. .ECST,année2012- ‐2013

éréoisomères:- ‐lesstéréoisomèresdeconformation- nformation1àlaconformation2parunerotationde120 (parrapportàlaliaisonsimpleC- ation1conformation2ECST,année2012- ‐2013

étique.LesliaisonscarbonehydrogèneC- formationlaplusstableestcellepourlaquelle:- ‐lesliaisonscovalentessontlesplus.- culeAmoléculeBECST,année2012- ‐2013

emi- ‐développéeCH3- ‐CHOH- ‐CH3Les2moléculessonténantiomèrescar:- ‐imagesl'unedel'autredansun.- métrie!ECST,année2012- ‐2013

012- ‐2013

muleAHC roir.Ils'agitdoncdedeux.- e'ensemble'dumêmecotédeladoubleliaison.- - ‐pent- ‐2- adoubleliaison.Pourle(Z)- ‐pent- ‐2- mèrescarilsontmêmeformulesemi- r.ECST,année2012- ‐2013

eAetBont- tutionexemple:CH3- ‐O- ‐CH3estisomèredeconstitutionavecCH3- ‐CH2- )peut- rationAest- ysiquesdifférentes)exemple:ECST,année2012- ‐2013

Cours&Terminale&S&! ECST,&année&201252013&! on!1!à!la!conformation!

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