Video: Koj pom R thiab S chirality li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Lub npe "sab tes" thiab "sab laug" nomenclature yog siv rau lub npe enantiomers ntawm a chiral compound. Cov stereocenters tau sau npe ua R los yog S . Xav txog thawj daim duab: tus xub nkhaus yog kos los ntawm qhov tseem ceeb tshaj plaws (1) hloov mus rau qhov tseem ceeb tshaj plaws (4) hloov pauv.
Ib yam li ib tug yuav nug, R thiab S chirality yog dab tsi?
Cov R / S system yog ib qho tseem ceeb nomenclature system rau denoting enantiomers. Txoj kev no sau tag nrho chiral chaw R los yog S raws li ib qho system uas nws cov neeg hloov pauv yog txhua tus muab qhov tseem ceeb, raws li Cahn-Ingold-Prelog cov cai tseem ceeb (CIP), raws li tus lej atomic.
Kuj Paub, puas yog R thiab S enantiomers? Stereocenters tau sau npe R los yog S Lub npe "sab tes" thiab "sab laug" nomenclature yog siv rau lub npe cov enantiomers ntawm ib qho chiral compound. Cov stereocenters tau sau npe ua R los yog S . Xav txog thawj daim duab: tus xub nkhaus yog kos los ntawm qhov tseem ceeb tshaj plaws (1) hloov mus rau qhov tseem ceeb tshaj plaws (4) hloov pauv.
Hauv qhov no, R lossis S configuration yog dab tsi?
R thiab S Cov ntawv sau tseg [hloov kho] Ua raws li cov kev taw qhia ntawm qhov tseem ceeb ntawm 3 qhov tseem ceeb ntawm qhov tseem ceeb tshaj plaws mus rau qhov tseem ceeb tshaj plaws (qis tshaj mus rau ntau tshaj, 1<2<3). Ib tug counterclockwise kev taw qhia yog ib S (sinister, Latin rau sab laug) kev teeb tsa . Lub clockwise kev taw qhia yog ib R (rectus, Latin rau txoj cai) kev teeb tsa.
Kuv yuav muab qhov tseem ceeb rau R thiab S li cas?
Muab rau tus qhov tseem ceeb (siab = 1 txog qis = 4) rau txhua pab pawg txuas nrog kev hlub tshua Center raws li tus lej atomic. Reposition lub molecule kom qis tshaj qhov tseem ceeb pab pawg nyob deb ntawm koj li yog tias koj tab tom saib raws C-(4) σ daim ntawv cog lus. Yog tias koj siv tus qauv, tuav qhov qis tshaj qhov tseem ceeb pab pawg hauv koj lub nrig.
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