Video: Grignard reagent txhais li cas?
2024 Tus sau: Miles Stephen | [email protected]. Kawg hloov kho: 2023-12-15 23:36
Txhais ntawm Grignard reagent .: ib qho ntawm ntau lub tebchaw ntawm magnesium nrog cov organic radical thiab halogen (raws li ethyl-magnesium iodide C2H5MgI) uas tuaj yeem nkag siab (xws li dej, cawv, amines, acids) hauv cov Grignard tshuaj tiv thaiv.
Ua raws li qhov xav tau, Grignard reagent yog dab tsi?
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.
Ib yam li ntawd, Grignard puas yog sn2? Grignards tsis ua SN 2 Cov tshuaj tiv thaiv nrog feem ntau alkyl halides Acetylide SN 2 tshuaj tiv thaiv nrog halide. Grignard SN2 tshuaj tiv thaiv nrog halide.
Yog li ntawd, dab tsi yog Grignard reagent nws npaj li cas?
Grignard reagents yog tsim los ntawm kev ntxiv cov halogenoalkane rau me me magnesium nyob rau hauv ib lub hwj uas muaj ethoxyethane (feem ntau hu ua diethyl ether los yog "ether"). Lub raj mis haum nrog lub reflux condenser, thiab qhov sib tov yog sov li ntawm ib da dej rau 20 - 30 feeb.
Dab tsi yog qhov tseem ceeb ntawm Grignard reagent?
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 tseem ceeb rau kev tsim cov carbon-carbon bonds.
Pom zoo:
Koj txhais qhov hnyav txhais li cas?
Cov ntsiab lus. Weighted Mean: Ib qho txhais tau tias qee qhov txiaj ntsig pab ntau dua li lwm tus. Thaum qhov hnyav ntxiv rau 1: tsuas yog muab txhua qhov hnyav los ntawm tus nqi sib xws thiab suav tag nrho. Txwv tsis pub, muab txhua qhov hnyav w los ntawm nws qhov sib piv tus nqi x, suav tias tag nrho, thiab faib los ntawm qhov sib npaug ntawm qhov hnyav: Qhov Ntsuas Ntsuas = ΣwxΣw
Koj txhais li cas los ntawm lo lus txhais?
Lub ntsiab lus txhais yog ib nqe lus ntawm lub ntsiab lus ntawm ib lo lus (ib lo lus, kab lus, lossis lwm yam cim). Cov lus txhais tau muab faib ua ob pawg loj, cov ntsiab lus tsis txaus ntseeg (uas sim muab lub ntsiab lus ntawm lub ntsiab lus) thiab cov ntsiab lus txuas ntxiv (uas sim sau cov khoom uas ib lo lus piav qhia)
Yuav ua li cas npaj iodoform reagent?
Solub poov tshuaj carbonate hauv 20 ml dej hauv 100 ml Erlenmeyer hwj. Txog 3.5 mL ntawm acetone ntxiv rau cov tshuaj no. Ntxiv cov hmoov iodine rau hauv lub hwj Erlenmeyer, nco ntsoov do cov sib tov. Muab qhov sib tov no tso rau hauv ib da dej sov ntawm qhov kub ntawm 70 mus rau 80 degrees Celsius rau li 15 feeb
Txhais tau li cas los txhais ib daim duab peb sab?
Kev txhais lus. Kev txhais lus yog ib qho kev hloov pauv uas tshwm sim thaum ib daim duab tau txav los ntawm ib qho chaw mus rau lwm qhov chaw yam tsis tau hloov nws qhov loj, duab lossis kev taw qhia. Txhawm rau txhais cov ntsiab lus P (x, y), ib chav nyob sab xis thiab b units, siv P'(x + a, y + b)
Yuav ua li cas ua ammonium molybdate reagent?
Dissolve 1.0 g ntawm ammonium molybdate nyob rau hauv 100 ml ntawm 2 M H2SO4. Kev daws teeb meem (2). Dissolve 0.10 g ntawm hydrazine sulfate hauv 100 ml dej. Tam sim ntawd ua ntej siv, sib tov 10 ml ntawm kev daws (1) nrog 10 ml ntawm kev daws (2), thiab dilute mus rau 100 ml nrog dej