Dab tsi yog qhov khoom ntawm qhov tshuaj tiv thaiv Grignard?
Dab tsi yog qhov khoom ntawm qhov tshuaj tiv thaiv Grignard?

Video: Dab tsi yog qhov khoom ntawm qhov tshuaj tiv thaiv Grignard?

Video: Dab tsi yog qhov khoom ntawm qhov tshuaj tiv thaiv Grignard?
Video: Dab tsi yog qhov tseeb txog cov tshuaj tiv thaiv COVID-19? 2024, Kaum ib hlis
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Khaws qhov no hauv kev xav, yuav ua li cas tshwm sim hauv Grignard cov tshuaj tiv thaiv?

ar/) yog ib qho tshuaj organometallic tshuaj tiv thaiv nyob rau hauv uas alkyl, allyl, vinyl, los yog aryl-magnesium halides ( Grignard reagent ) ntxiv rau pawg carbonyl hauv ib qho aldehyde lossis ketone. Qhov no tshuaj tiv thaiv yog ib qho tseem ceeb rau kev tsim cov carbon-carbon bonds.

Tsis tas li ntawd, Grignard reagent tsim li cas? A Grignard reagent yog tsim los ntawm kev khi ntawm cov hlau mus rau carbon atom hauv ib pawg alkyl. Ib pawg alkyl muaj cov pa roj carbon thiab hydrogen atom. Thaum nws txuas nrog halogen atom, lawv tuaj yeem siv los ua Grignard reagents . Bromine thiab iodine yog cov feem ntau siv halogen atoms, vim lawv reactivity.

Ntawm no, dab tsi yog Grignard reagent nrog piv txwv?

A Grignard reagent los yog Grignard Cov tshuaj sib xyaw ua ke yog cov tshuaj sib xyaw nrog cov qauv generic R-Mg-X, qhov twg X yog halogen thiab R yog ib pawg organic, feem ntau yog alkyl lossis aryl. Ob yam piv txwv yog methylmagnesium chloride H. 3C-Mg-Cl thiab phenylmagnesium bromide (C. 6H. 5)-Mg-Br.

Puas yog Grignard sn1 cov tshuaj tiv thaiv?

Organometallic Reagents yog Strong Nucleophiles Cov kev sib txuas ntawm cov pa roj carbon atom thiab cov hlau atom yog polar. Grignard cov tshuaj tiv thaiv tsim kom muaj kev hloov pauv cov tshuaj tiv thaiv ntawm vinylic carbons. Qhov no tshuaj tiv thaiv txoj hauv kev yog qhov muaj txiaj ntsig zoo vim cov yas halides tsis tuaj yeem teb los ntawm SN1 thiab SN2 mechanisms.

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