Qhov sib txawv tseem ceeb ntawm NaBH4 thiab LiAlH4 cov tshuaj tiv thaiv yog NaBH4 yog tus neeg saib xyuas tsis muaj zog, thaum LiAlH4 yog tus muaj zog txo tus neeg sawv cev.
NaBH4 thiab LiAlH4 yog txo tus neeg sawv cev. Cov no yog cov feem ntau qhov chaw ntawm hydride nucleophiles peb siv nyob rau hauv cov organic synthesis tshua. Lub npe ntawm NaBH4 yog sodium borohydride thaum lub npe ntawm LiAlH4 yog lithium aluminium hydride.
NaBH4 Reaction yog dab tsi?
NaBH4 cov tshuaj tiv thaiv yog hom tshuaj tiv thaiv redox uas NaBH4 yog tus neeg sawv cev txo qis. Cov tshuaj formula NaBH4 sawv cev rau sodium borohydride. Nws yog ib qho ntawm feem ntau qhov chaw ntawm hydride nucleophiles. Cov tshuaj no muaj cov polar hlau-hydrogen bond. Yog li ntawd, thaum lub sij hawm redox cov tshuaj tiv thaiv, peb nrhiav tsis tau cov hydride anion; Yog li, qhov reagent no ua haujlwm los ntawm hydride vim muaj cov hlau-hydrogen daim ntawv cog lus. Txawm li cas los xij, thaum peb piv NaBH4 nrog LiAlH4, cov hlau-hydrogen bond ntawm LiAlH4 muaj ntau dua polar; yog li, nws yog ib tug muaj zog txo tus neeg sawv cev tshaj NaBH4. Qhov no feem ntau yog vim tias txhuas hauv LiAlH4 yog electronegative ntau dua li boron hauv NaBH4.
Sodium borohydride tuaj yeem txo ntau cov organic carbonyl tebchaw. Feem ntau, cov tshuaj no yog siv hauv chav kuaj los hloov cov ketone lossis aldehyde rau hauv cawv. Ntxiv mus, cov tshuaj tiv thaiv ntawm NaBH4 tuaj yeem txo cov acyl chlorides, anhydrides, thioesters, thiab imines ntawm chav tsev kub. Tsis tas li ntawd, NaBH4 reacts nrog dej thiab cawv, tsim hydrogen gas thiab borate ntsev.
Daim duab 01: Cov Qauv Tshuaj ntawm NaBH4
Tsis tas li ntawd, hauv NaBH4 cov tshuaj tiv thaiv, ib qho cawv (xws li methanol lossis ethanol) yog siv los ua cov kuab tshuaj rau txo cov ketones lossis aldehydes. Txawm li cas los xij, qhov reactivity ntawm NaBH4 tuaj yeem txhim kho lossis ntxiv los ntawm cov khoom sib txawv xws li methanol.
LiAlH4 Reaction yog dab tsi?
LiAlH4 yog hom tshuaj tiv thaiv redox qhov twg LiALH4 yog tus neeg sawv cev txo qis. Cov tshuaj formula LiAlH4 sawv cev rau lithium aluminium hydride. Nws muaj plaub daim ntawv cog lus hlau-hydrogen uas muaj ntau qhov polar vim qhov sib txawv ntawm electronegativity ntawm lithium thiab hydrogen atoms. Qhov no ua rau cov compound muaj zog txo tus neeg sawv cev. Tsis tas li ntawd, qhov sib xyaw no muaj nyob rau hauv cov khoom hauv chav sov uas nws muaj zog heev ntawm cov dej thiab tso tawm cov pa roj hydrogen thaum cov tshuaj tiv thaiv nrog dej. Cov tshuaj tiv thaiv no yog qhov txaus ntshai heev vim muaj qhov ua haujlwm siab ntawm cov tshuaj tiv thaiv sib tov.
Daim duab 02: Cov qauv tshuaj ntawm LiAlH4
LiAlH4 tuaj yeem hloov esters, carboxylic acids, acyl chlorides, aldehydes thiab ketones rau hauv lawv cov cawv sib xws. Ntxiv mus, nws tuaj yeem hloov amides, nitrile compounds, azides thiab nitro compounds rau hauv cov amines sib xws.
Qhov txawv ntawm NaBH4 thiab LiAlH4 Cov Lus Teb yog dab tsi?
NaBH4 thiab LiAlH4 yog cov tshuaj txo qis tshaj plaws hauv cov tshuaj lom neeg. Qhov sib txawv tseem ceeb ntawm NaBH4 thiab LiAlH4 yog NaBH4 yog tus neeg saib xyuas tsis muaj zog, thaum LiAlH4 yog tus neeg sawv cev txo qis. Thaum muab piv rau NaBH4 nrog LiAlH4, cov hlau-hydrogen bond ntawm LiAlH4 yog ntau dua polar; yog li, nws yog ib tug muaj zog txo tus neeg sawv cev tshaj NaBH4. Qhov no feem ntau yog vim tias txhuas hauv LiAlH4 yog electronegative ntau dua li boron hauv NaBH4.
Hauv qab infographic muab cov ncauj lus kom ntxaws txog qhov sib txawv ntawm NaBH4 thiab LiAlH4.
Summary – NaBH4 vs LiAlH4 Reaction
Tus neeg sawv cev txo qis yog cov tshuaj lom neeg uas tuaj yeem txo lwm yam khoom thaum oxidizing nws tus kheej. NaBH4 thiab LiAlH4 yog cov tshuaj txo qis tshaj plaws hauv cov organic chemistry. Qhov sib txawv tseem ceeb ntawm NaBH4 thiab LiAlH4 yog NaBH4 yog tus neeg saib xyuas tsis muaj zog, thaum LiAlH4 yog tus muaj zog txo tus neeg sawv cev.
