Qhov twg ntawm cov catalyst hauv qab no yog siv rau syn-hydroxylation ntawm alkene?

Cov txheej txheem:

Qhov twg ntawm cov catalyst hauv qab no yog siv rau syn-hydroxylation ntawm alkene?
Qhov twg ntawm cov catalyst hauv qab no yog siv rau syn-hydroxylation ntawm alkene?

Video: Qhov twg ntawm cov catalyst hauv qab no yog siv rau syn-hydroxylation ntawm alkene?

Video: Qhov twg ntawm cov catalyst hauv qab no yog siv rau syn-hydroxylation ntawm alkene?
Video: Qhia saib yus tus hlub lub xov tooj seb nws kov txog dab tsi thaum yus nyob deb 2024, Kaum ib hlis
Anonim

Osmium catalyzed cov tshuaj tiv thaiv. Osmium tetroxide (OsO4) yog cov oxidant nrov siv hauv dihydroxylation ntawm alkenes vim nws kev ntseeg tau thiab ua haujlwm nrog kev tsim cov syn-diols.

YDab tsi yog Syn hydroxylation ntawm alkenes?

Cov tshuaj tiv thaiv uas ntxiv ob lub hydroxyl rau tib lub ntsej muag ntawm alkene ob daim ntawv cog lus raws li nws tau hloov mus rau ib daim ntawv cog lus ib daim ntawv cog lus.

YYuav ua li cas reagent yog Synhydroxylation?

Syn Dihydroxylation

Dihydroxylated cov khoom (glycols) tau los ntawm cov tshuaj tiv thaiv aqueous potassium permanganate (pH > 8)lossis osmium tetroxide hauv cov tshuaj pyridine.

YPuas yog hydroxylation yog ib qho kev sib txuas lossis tiv thaiv?

Qhov tshwm sim yog anti-hydroxylation ntawmob daim ntawv cog lus, sib piv rau cov syn-stereoselectivity ntawm txoj kev ua ntej. Hauv qhov sib npaug hauv qab no cov txheej txheem no tau piav qhia rau cis-disubstituted epoxide, uas, ntawm chav kawm, tuaj yeem npaj los ntawm cov sib thooj cis-alkene.

Qhov twg ntawm cov reagents hauv qab no yog siv rau dihydroxylation?

Dihydroxylation nrog Osmium Tetroxide Kev oxidation ntawm alkenes nrog osmium tetroxide muab cov txiaj ntsig zoo ntawm vicinal diols. Txawm li cas los xij, qhov reagent no yog ob qho tib si kim thiab muaj kuab lom heev. Yog li ntawd, nws tsuas yog siv nyob rau hauv me me kev sim syntheses, tsis yog nyob rau hauv industrial processes.

Pom zoo:

Tus catalyst twg yog siv hauv cov txheej txheem bergius?

Tus catalyst twg yog siv hauv cov txheej txheem bergius?

Iron tseem yog cov khoom siv hlau uas xaiv vim yog tus nqi thiab qhov muaj nyob. Kev siv cov sulfur hauv cov tshuaj tiv thaiv kab mob ntawm cov txheej txheem Bergius tau pom tias muaj txiaj ntsig zoo rau kev ua kom muaj txiaj ntsig ntawm cov catalyst .

Cov catalyst twg yog siv hauv hydrodesulfurization?

Cov catalyst twg yog siv hauv hydrodesulfurization?

Catalysts thiab cov txheej txheem Txawm hais tias tsis siv tau, ruthenium disulfide zoo nkaus li yog ib qho tseem ceeb tshaj plaws catalyst, tab sis binary ua ke ntawm cob alt thiab molybdenum kuj tseem muaj zog heev. Ib cag los ntawm cov txheej txheem cob alt-hloov MoS 2 catalyst, nickel thiab tungsten kuj siv, nyob ntawm seb qhov khoom noj.

Qhov twg hauv qab no yog siv los xyuas kom meej tias cov ntaub ntawv yog cov tsiaj ntawv?

Qhov twg hauv qab no yog siv los xyuas kom meej tias cov ntaub ntawv yog cov tsiaj ntawv?

Qhov twg hauv qab no yog siv los xyuas kom meej tias cov ntaub ntawv yog cov tsiaj ntawv? Nqe lus piav qhia - Siv qhov kev xaiv - c nrog cov khoom siv xaiv txhawm rau txheeb xyuas tias cov ntaub ntawv tau raug txheeb xyuas . Qhov twg hauv qab no yog siv rau decompressing cov ntaub ntawv?

Qhov twg ntawm cov kab ke hauv qab no yog siv los ua cov thauj tog rau nkoj tom qab kev nruj?

Qhov twg ntawm cov kab ke hauv qab no yog siv los ua cov thauj tog rau nkoj tom qab kev nruj?

Kev piav qhia: Lub Freyssinet anchorage system yog siv dav hauv Tebchaws Europe thiab Is Nrias teb muaj lub tog raj kheej nrog lub conical sab hauv los ntawm qhov siab tensile xov hlau hla thiab tawm tsam cov phab ntsa uas xov hlau yog wedged los ntawm ib tug conical plug lined longitudinally nrog grooves rau tsev cov xov hlau .

Qhov twg ntawm cov kuab tshuaj hauv qab no yog siv rau hauv kev sib txuas ntawm chlorofluorocarbon?

Qhov twg ntawm cov kuab tshuaj hauv qab no yog siv rau hauv kev sib txuas ntawm chlorofluorocarbon?

Dichloromethane yog ntau yam kev lag luam hnyav. Tus kws tshawb fawb Belgian Frédéric Swarts pioneer lub synthesis ntawm CFCs nyob rau hauv 1890s . CFCs ua li cas? CFCs thiab HCFCs feem ntau yog tsim los ntawm kev sib pauv halogen pib los ntawm chlorinated methanes thiab ethanesCov derivatives brominated yog tsim los ntawm cov tshuaj dawb-radical ntawm chlorofluorocarbons, hloov C-H daim ntawv cog lus nrog C- Br daim ntawv cog lus.