Cov txheej txheem:
- Nws yog ib qho hnyav hauv kev sib txuas ntawm benzimidazole?
- Koj ua li cas benzimidazole recrystallization?
- Cov kuab tshuaj twg yog siv los ua kom rov ua kom muaj zog hauv kev sib txuas ntawm Benztriazole?
- Tus catalyst yog siv rau kev sib txuas ntawm para benzimidazole?
Video: Cov kuab tshuaj twg yog siv rau recrystallization hauv synthesis ntawm benzimidazole?
2024 Tus sau: Fiona Howard | [email protected]. Kawg hloov kho: 2024-01-10 06:38
Cov txheej txheem rau Kev Npaj Benzimidazoles Yog xav tau kev lim dej ntxiv, los ntawm recrystallization nws tau yaj hauv EtOH (10 mL) thiab tom qab ntawd nchuav rau hauv dej khov (30 mL). Cov khoom ntshiab yog lim, ntxuav nrog dej khov, thiab tom qab ziab.
Nws yog ib qho hnyav hauv kev sib txuas ntawm benzimidazole?
Ib yam li ntawd, cov tshuaj tiv thaiv tau ua nyob rau hauv cov kuab tshuaj sib txawv xws li CH3CN, MeOH, CHCl3, ether , thiab DMF; CHCl3 tau pom tias yog cov kuab tshuaj haum tshaj plaws uas muab benzimidazole nrog 40% tawm los.
Koj ua li cas benzimidazole recrystallization?
Lim tawm cov khoom siv roj ntsha benzimidazole los ntawm kev siv lub twj tso kua mis, ntxuav nrog dej txias, ntws zoo thiab ntxuav dua nrog 25 ml ntawm dej txias. Recrystallisation: Dissolve cov khoom synthesized nyob rau hauv 400 ml ntawm boiling dej, ntxiv 2 g ntawm decolourising carbon thiab zom rau 15 feeb
Cov kuab tshuaj twg yog siv los ua kom rov ua kom muaj zog hauv kev sib txuas ntawm Benztriazole?
Benzotriazole tuaj yeem npaj los ntawm kev kho mob o-phenylenediamine nrog nitrous acid(liberated thaum lub sij hawm cov tshuaj tiv thaiv ntawm sodium nitrite thiab acetic acid) los tsim mono-diazonium ntsev uas ua raws li spontaneous intramolecular cyclization Cov tshuaj tiv thaiv los tsim benzotriazole.
Tus catalyst yog siv rau kev sib txuas ntawm para benzimidazole?
Synthesis ntawm benzimidazoles tau tsim los ntawm o-phenylenediamine nrog aldehydes siv boric acid tus catalyst muaj txiaj ntsig hauv cov tshuaj tiv thaiv me me hauv cov xov xwm aqueous.
Pom zoo:
Puas yog kas fes yog kuab los yog kuab tshuaj?
Thaum koj brew kas fes, koj tab tom tsim kev daws teeb meem. Cov me me ntawm cov hauv paus kas fes, los yog cov kuab tshuaj, yog dissolved hauv dej, cov kuab tshuaj . Puas yog khob kas fes yog kuab los yog kuab tshuaj? Cov qab zib uas koj ntxiv rau hauv khob kas fes yog lub npe hu ua tus soluteThaum cov kua dej no ntxiv rau cov kua, uas yog hu ua cov kuab tshuaj, cov txheej txheem dissolving pib.
Koj puas ntxiv cov kuab tshuaj rau cov kuab tshuaj?
Mov kom huv si kom yaj lub solute Thaum cov kuab tau yaj lawm, ntxiv cov kuab tshuaj uas tseem tshuav los ua cov tshuaj uas xav tau ntim thiab sib tov kom huv si. Piv txwv li, ua 0.5 Litres ntawm 0.5 molar NaCl: … Ua ib qho kev daws teeb meem ntawm ib qho concentration ntawm cov tshuaj hauv Tshuag yog hu ua dilution .
Hauv tlc lub hom phiaj ntawm kev siv cov kuab tshuaj eluent yog dab tsi?
Q: Hauv TLC, lub hom phiaj ntawm kev siv cov kuab tshuaj eluent yog dab tsi? Cov ntsiab lus yog theem mobile hauv chromatography, piv txwv li, cov kuab tshuaj hauv lub tank tsim. Thaum lub sij hawm txoj kev loj hlob ntawm lub chromatogram, lub eluent faib cov qauv koj pauv mus rau lub TLC phaj tshaj lub adsorbent ntawm lub phaj .
Thaum cov kuab tshuaj evaporates dab tsi tshwm sim rau qhov concentration ntawm cov tshuaj?
Qhov no txhais tau hais tias yog tias koj cov kuab tshuaj evaporating thiab qhov kub thiab txias tsis tu ncua, ces solute yuav precipitate tawm ntawm cov tshuaj. Qhov concentration ntawm cov tshuaj yuav tseem nyob rau ntawm nws qhov siab tshaj plaws raws li koj muaj kev txhawj xeeb nrog cov nyiaj solute yaj .
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.
