Txoj hauv kev zoo tshaj plaws kom paub qhov txawv ntawm benzaldehyde thiab acetophenone yog siv Tollen's reagent. Benzaldehyde tuaj yeem txo Tollen's reagent, muab cov xim liab-xim av ntawm Cu2O, whereas acetophenone tsis pom muaj kev cuam tshuam rau Tollen's reagent.
Tollen's reagent yog cov tshuaj reagent muaj txiaj ntsig hauv kev tshawb nrhiav cov pab pawg ua haujlwm aldehyde, suav nrog cov pab pawg ua haujlwm aromatic aldehyde thiab alpha-hydroxy ketone ua haujlwm. Cov reagent no tau raug hu ua German chemist Bernhard Tollens.
Benzaldehyde yog dab tsi?
Benzaldehyde tuaj yeem txhais tau tias yog cov tshuaj tsw qab aldehyde uas muaj cov tshuaj formula C6H5CHO. Nws muaj ib pab pawg phenyl txuas nrog aldehyde ua haujlwm pab pawg. Ntxiv mus, nws yog qhov yooj yim tshaj plaws aromatic aldehyde. Nws tshwm sim raws li cov kua uas tsis muaj xim thiab muaj cov ntxhiab tsw zoo li almond. Nws molar mass yog 106.12 g / mol. Nws melting point yog -57.12 ° C, thaum nws boiling point yog 178.1 ° C.
Daim duab 01: Benzaldehyde
Thaum xav txog kev tsim cov benzaldehyde, txoj hauv kev tseem ceeb ntawm kev tsim cov tshuaj no yog kua theem chlorination thiab oxidation ntawm toluene. Txawm li cas los xij, qhov sib xyaw no tshwm sim hauv ntau yam khoom noj thiab, piv txwv li, hauv almonds. Yog li ntawd, ib qho ntawm cov kev siv loj ntawm cov tshuaj no yog nws siv los ua ib qho almond tsw hauv cov khoom noj thiab cov khoom tsw qab.
Acetophenone yog dab tsi?
Acetophenone tuaj yeem txhais tau tias yog cov organic compound uas muaj cov tshuaj formula C8H8O. Nws yog ketones, thiab nws yog ketone yooj yim tshaj plaws ntawm cov ketones aromatic. Lub npe IUPAC ntawm cov tshuaj no yog 1-Phenylethane-1-ib. Lwm cov npe muaj xws li methyl phenyl ketone thiab phenylethanone.
Daim duab 02: Acetophenone
Cov molar loj ntawm acetophenone yog 120.15 g / mol; Lub melting point ntawm 19-20 ° C, thaum lub boiling point yog 202 ° C. Tsis tas li ntawd, qhov sib xyaw no tshwm sim raws li cov xim tsis muaj xim, kua nplaum. Ntxiv mus, peb tuaj yeem tau txais nws ua cov khoom lag luam los ntawm oxidation ntawm ethylbenzene los ua ethylbenzene hydroperoxide.
Thaum xav txog kev siv acetophenone ntawm kev lag luam teev, nws yog ib qho tseem ceeb ua cov khoom ua ntej rau kev tsim cov resins, ua cov khoom xyaw hauv cov tshuaj tsw qab, thiab lwm yam. kev tsim kho ntau yam tshuaj thiab.
Yuav Ua Li Cas Qhov Sib Txawv Ntawm Benzaldehyde thiab Acetophenone?
Benzaldehyde yog ib qho uas muaj ntxhiab aldehyde, thaum acetophenone yog cov tshuaj tsw qab ketone. Yog li ntawd, txoj kev yooj yim tshaj plaws kom paub qhov txawv ntawm benzaldehyde thiab acetophenone yog siv Tollen's reagent vim hais tias pawg neeg ua haujlwm aldehyde tuaj yeem tsim cov dej nag nrog cov reagent no. Benzaldehyde tuaj yeem txo Tollen's reagent, muab cov xim liab-xim av ntawm Cu2O, whereas acetophenone tsis pom muaj kev cuam tshuam rau Tollen's reagent.
Thaum Tollen qhov kev sim, peb yuav tsum tau siv peb lub raj huv huv thiab qhuav - ob lub raj kuaj uas muaj cov qauv thiab lwm qhov uas muaj cov dej distilled. Tom qab ntawd peb yuav tsum ntxiv Tollen's reagent rau txhua qhov ntawm cov raj ntsuas no thiab tom qab ntawd muab lawv tso rau hauv da dej li ib feeb. Tom qab ntawd peb tuaj yeem soj ntsuam cov xim liab-xim av xim av nyob rau hauv lub raj tshuaj ntsuam uas muaj benzaldehyde, tab sis tsis muaj xim hloov los yog precipitate formations nyob rau hauv ob lub xeem raj uas muaj acetophenone thiab distilled dej. Ntawm no, peb siv cov dej distilled ua ib qho qauv dawb los soj ntsuam cov xim sib txawv nrog cov qauv.
Cov lus hauv qab no qhia txog qhov sib txawv ntawm cov tebchaw no, ua rau nws yooj yim dua kom paub qhov txawv ntawm benzaldehyde thiab acetophenone.
Summary – Benzaldehyde vs Acetophenone
Benzaldehyde yog ib qho tshuaj tsw qab aldehyde uas muaj cov tshuaj formula C6H5CHO, thaum acetophenone yog cov organic compound uas muaj cov tshuaj formula C8H8O. Txoj kev yooj yim tshaj plaws kom paub qhov txawv ntawm benzaldehyde thiab acetophenone yog siv Tollen's reagent; aldehyde ua haujlwm pab pawg tuaj yeem tsim ua ntej nrog cov reagent no. Benzaldehyde tuaj yeem txo Tollen's reagent, muab cov xim liab-xim av ntawm Cu2O, whereas acetophenone tsis pom muaj kev cuam tshuam rau Tollen's reagent.
