Qhov sib txawv tseem ceeb ntawm Newman thiab Sawhorse qhov projection yog Newman qhov projection yog sab-ntawm qhov pom ntawm cov molecule, whereas Sawhorse projection yog lub ntsej muag ntawm lub molecule.
Lub Newman qhov projection thiab Sawhorse projection yog qhov tseem ceeb hauv kev txiav txim siab qhov sib txawv ntawm alkanes. Cov kev kwv yees no muaj txiaj ntsig zoo hauv alkane stereochemistry.
Newman Projection yog dab tsi?
Newman qhov projection yog qhov pom ntawm cov tshuaj tiv thaiv los ntawm pem hauv ntej mus rau sab nraub qaum, qhov twg lub atom nyob rau pem hauv ntej tau qhia tias yog ib qho chaw, thiab lub atom nyob rau sab nraum qab yog qhia raws li lub voj voog. Hom kev ntsuas no yog qhov tseem ceeb hauv stereochemistry ntawm alkanes. Hauv Newman qhov projection, peb hu cov pa roj carbon atom nyob rau pem hauv ntej "proximal carbon" thiab cov pa roj carbon atom tom qab "distal carbon".
Daim duab 01: Ib Tus Neeg Tshiab Txoj Haujlwm ntawm Butane
A Newman qhov projection yog qhov tseem ceeb hauv kev txiav txim siab lub kaum sab xis ntawm cov pa roj carbon atoms ze ze thiab deb. Peb tuaj yeem siv hom phiaj xwm no ua lwm txoj hauv kev rau Sawhorse projection thiab Natta projection. Lub sawhorse projection tau piav qhia hauv qab no. Natta projection yog ib hom kev kwv yees uas peb tuaj yeem siv los piav txog cov molecules hauv kev ua tiav stereochemistry hauv 2D skeletal formula.
Newman qhov projection tau muab npe tom qab Asmeskas kws tshuaj Melvin Spencer Newman. Nws pom cov qauv no hauv xyoo 1952 ua ib feem hloov ntawm Fischer projection. Fischer qhov projection tsis tuaj yeem muab cov ntsiab lus sib txawv. Txawm li cas los xij, Fischer projection yog qhov tseem ceeb hauv kev piav qhia ntawm carbohydrates. Nws zoo nkaus li tus ntaiv uas qhia cov khoom siv tshuaj lom neeg thiab cov tshuaj lom neeg ntawm ob sab, hauv qab thiab sab saum toj. Tsis tas li ntawd, peb tuaj yeem siv Newman qhov projection los tso saib txhua yam kev sib cog lus tshuaj, tsis yog tib daim ntawv cog lus ntawm carbon atoms ntawm alkane. Piv txwv li, peb tuaj yeem siv nws los kawm cyclic molecules.
Sawhorse Projection yog dab tsi?
Sawhorse qhov projection yog cov zaub ntawm lub molecule los ntawm lub kaum sab xis es tsis yog sab ntawm qhov projection. Nws zoo ib yam li Newman qhov projection, tab sis hom projection no qhia txog cov pa roj carbon-carbon daim ntawv cog lus ntawm nruab nrab ntawm cov molecule, tsis zoo li Newman projection. Hauv lwm lo lus, C-C daim ntawv cog lus tau muab zais rau hauv Newman qhov projection. Tsis tas li ntawd, peb tuaj yeem kos qhov kev kwv yees no nyob rau hauv cov dab noj hnub lossis qhov kev sib haum xeeb.
Daim duab 02: Sawhorse Projection ntawm Butane
A Sawhorse projection yog ib kab qauv ntawm cov molecule uas peb tuaj yeem kos yam tsis muaj hydrogens. Peb tuaj yeem hloov pauv Sawhorse qhov projection rau hauv Newman qhov projection los ntawm kev tso cov atoms kom zoo.
Zoo sib xws ntawm Newman thiab Sawhorse Projection
- Newman thiab Sawhorse projections qhia cov qauv ntawm cov organic molecule.
- Ob qhov kev kwv yees tseem ceeb hauv kev tau txais cov ntsiab lus sib haum xeeb ntawm cov molecule.
- Cov kev kwv yees no tuaj yeem pom cov dab tuag thiab staggered conformations.
Qhov txawv ntawm Newman thiab Sawhorse Projection
Newman thiab Sawhorse projections yog ib qho tseem ceeb hauv kev nthuav tawm qhov kev sib haum xeeb ntawm alkanes. Newman qhov projection yog qhov pom ntawm cov tshuaj tiv thaiv los ntawm pem hauv ntej mus rau sab nraub qaum qhov twg lub atom nyob rau pem hauv ntej yog qhia raws li ib tug dot thiab lub atom nyob rau tom qab yog pom raws li ib tug lub voj voog, thaum Sawhorse projection yog cov zaub ntawm ib tug molecule los ntawm lub kaum sab xis. qhov projection sab. Qhov sib txawv tseem ceeb ntawm Newman thiab Sawhorse qhov projection yog Newman qhov projection yog ib sab-ntawm cov tsos ntawm ib tug molecule, whereas Sawhorse projection yog angular tsos ntawm ib tug molecule.
Cov hauv qab no infographic teev qhov sib txawv ntawm Newman thiab Sawhorse qhov projection hauv daim ntawv teev npe rau ib sab ntawm kev sib piv
Summary – Newman vs Sawhorse Projection
Newman qhov projection yog qhov pom ntawm cov tshuaj tiv thaiv los ntawm pem hauv ntej mus rau sab nraub qaum uas lub atom nyob rau pem hauv ntej tau qhia tias yog ib qho chaw, thiab lub atom nyob rau sab nraum qab yog qhia raws li lub voj voog. Sawhorse projection yog cov zaub ntawm ib lub molecule los ntawm lub kaum sab xis es tsis yog sab ntawm qhov projection. Yog li ntawd, qhov sib txawv tseem ceeb ntawm Newman thiab Sawhorse qhov projection yog Newman qhov projection yog ib sab ntawm cov tsos ntawm ib tug molecule, whereas Sawhorse projection yog angular tsos ntawm ib tug molecule.
