CAS 924-50-5|Methyl 3-methyl-2-butenoate

Taw qhia
Methyl methacrylate yog ib qho tseem ceeb nruab nrab ntawm kev tsim cov chrysanthemic acid los ntawm Martel txoj kev.

Specification ntawm CAS 924-50-5|Methyl 3-methyl-2-butenoate

Synthesis ntawmCAS 924-50-5|Methyl 3-methyl-2-butenoate

Nws txoj kev npaj yog siv diacetone (1mol) thiab sodium hypochlorite tov (500mL) mus rau lub zog do hauv cov tshuaj tiv thaiv lub khob, cov tshuaj tiv thaiv yog exothermic, qhov kub thiab txias tau nce mus rau 50 degree thiab sodium hypochlorite (150mL, tag nrho cov nyiaj yog 5mol) yog tsis tu ncua ntxiv dropwise, thiab tus nqi ntawm kev ntxiv yog tswj, Cov tshuaj tiv thaiv kub tau tswj ntawm 55-60 degree . Thaum cov sodium hypochlorite tau ntxiv, qhov kub tau nce mus txog 65 degree, thiab tom qab ntawd txuas ntxiv nplawm rau 3-4 teev hauv qab ntuj txias. Ib qho me me ntawm Na2SO3 tau ntxiv los txo cov sodium hypochlorite ntau dhau, thiab tom qab ntawd cov sib tov tau tso tseg kom cais cov txheej. Chloroform.

Acidified nrog dilute H2SO4 ntawm 20 degree, muab rho tawm nrog chloroform, ntxuav nrog dej, qhuav, evaporated cov kuab tshuaj chloroform, thiab cov seem tau txias kom tau cov khoom daj, uas yog, isopentonic acid (CAS[541-47-9]), mp60-65 degree (cov ntaub ntawv tus nqi mp68.5-69.5 degree), bp194-195 degree .

Sib tov 1 mol ntawm cov saum toj no-npaj prenyl acid nrog 4.4 mol ntawm methanol, ntxiv me ntsis concentrated sulfuric acid raws li ib tug catalyst, do ntawm 60-70 degree C rau 5 h, txias thiab dilute nrog dej kom cais cov organic txheej, Tshem tawm cov txheej txheej aqueous nrog chloroform, thiab sib tov nrog cov organic txheej. Ua ke, ntxuav nrog dilute Na2CO3 tov, ntxuav nrog dej, qhuav, evaporated chloroform, thiab sau cov feem ntawm 130-140 degree li methyl prenyl.

Tsis tas li ntawd, isobutylene thiab carbon tetrachloride yog siv los pressurize telomerization cov tshuaj tiv thaiv nyob rau hauv lub xub ntiag ntawm tooj liab catalyst, thiab ces hydrolyzed nrog sulfuric acid kom tau prenyl acid. Prenyl esters tau txais. Trialkyl phosphite kuj tuaj yeem cuam tshuam nrog ethyl chloroacetate los tsim ethyl acetate dialkyl phosphite, thiab tom qab ntawd hauv cov kuab tshuaj polar, nyob rau hauv muaj lub hauv paus muaj zog (xws li sodium hydride, sodium amide, sodium alkoxide), thiab lwm yam nrog acetone. Cov tshuaj tiv thaiv Wadsovorth-Emmons tau ua tiav kom tau txais prenyl ester (cov txiaj ntsig hauv thawj kauj ruam yog 90 feem pua, thiab cov txiaj ntsig hauv qib thib ob yog 84.5 feem pua).

Cim npe nrov: cas 924-50-5|methyl 3-methyl-2-butenoate, nqe, hais, luv nqi, hauv Tshuag, kev muag