Video: Koj yuav paub li cas yog lub chaw chiral yog R lossis S?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Kos ib qho nkhaus los ntawm thawj qhov tseem ceeb hloov pauv mus rau qhov thib ob-qhov tseem ceeb hloov pauv thiab tom qab ntawd los ntawm qhov thib peb. Yog qhov nkhaus mus clockwise, lub chiral chaw raug xaiv R ; yog qhov nkhaus mus counterclockwise, lub chiral chaw raug xaiv S.
Kuj paub, koj paub li cas yog nws R lossis S configuration?
Kos tus xub pib los ntawm qhov tseem ceeb ib qho thiab mus rau qhov tseem ceeb thib ob thiab tom qab ntawd mus rau qhov tseem ceeb 3: Yog tus xub mus clockwise, zoo li hauv qhov no, qhov tseeb kev teeb tsa yog R . As opposed to qhov no, yog tus xub mus counterclockwise ces tus kiag kev teeb tsa yog S.
Ib sab saum toj, dab tsi yog r thiab s hauv chemistry? 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) configuration. Lub clockwise kev taw qhia yog ib R (rectus, Latin rau txoj cai) configuration.
Hais txog qhov no, S thiab R configuration yog dab tsi?
Cov R / S system yog ib qho tseem ceeb nomenclature system rau denoting enantiomers. Txoj hauv kev no sau txhua qhov chaw chiral 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.
Nws txhais li cas los ua chiral?
Lus txhais: Chiral . Ib molecule yog chiral yog nws yog tsis superimposable ntawm nws daim iav duab. Feem ntau chiral Cov molecules tuaj yeem txheeb xyuas los ntawm lawv qhov tsis muaj lub dav hlau ntawm symmetry lossis qhov nruab nrab ntawm symmetry. Koj txhais tes yog a chiral yam, as it ua tsis muaj ob qho ntawm cov hom symmetry.
Pom zoo:
Koj yuav ua li cas thiaj paub tias qhov sib npaug ua haujlwm lossis tsis yog?
Nws kuj yog ib qho yooj yim los txiav txim seb qhov sib npaug yog qhov ua haujlwm los ntawm kev daws rau y. Thaum koj muab ib qho kev sib npaug thiab tus nqi tshwj xeeb rau x, qhov yuav tsum tsuas yog ib qho sib txuas y-tus nqi rau qhov x-tus nqi.Txawm li cas los xij, y2 = x + 5 tsis yog qhov ua haujlwm; yog tias koj xav tias x = 4, ces y2 = 4 + 5 = 9
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