Tom ntej: 3,4-(Methylenedioxy) phenylacetonitrile CAS 4439-02-5

Cov khoom pib: Xaiv catechol ua cov khoom pib vim nws muaj benzodioxolane moiety nyob rau hauv lub hom phiaj molecule ntawm kua txob acetonitrile.
Oxidation kauj ruam: Ua ntej, xaiv oxidation ntawm catechol yog ua los qhia txog cov pab pawg uas xav tau lossis hloov cov qauv. Piv txwv tias peb xav ntxiv ib pawg carboxyl lossis aldehyde los ntawm oxidation los muab qhov chaw ua haujlwm rau cov tshuaj tiv thaiv tom ntej. Txawm li cas los xij, nws yuav tsum tau muab sau tseg tias txoj kev ncaj qha oxidation synthesis ntawm kua txob acetonitrile tsis yog ib qho, thiab qhov no tsuas yog xeeb los ua kom tau raws li qhov yuav tsum tau ua ntawm qhov teeb meem.
Chemical equation (hypothetical):
Catechol → Oxidized nruab nrab
Raws li qhov no yog cov kauj ruam hypothetical, cov oxidants tshwj xeeb thiab tej yam kev mob tsis tau muab, tab sis nws yog xav txog yuav siv cov oxidants muaj zog xws li poov tshuaj permanganate (KMnO4), poov tshuaj dichromate (K2Cr2O7), thiab lwm yam, nyob rau hauv tsim nyog cov kuab tshuaj thiab tej yam kev mob.

Cyclization: Tom ntej no, hnov ​​​​mob oxidized intermediate tau nyob rau hauv cov kauj ruam dhau los nrog cov reagents tsim nyog los tsim ib lub nplhaib kua txob. Cov kauj ruam no yuav koom nrog ntau cov kauj ruam, nrog rau kev sib xyaw ua ke, cyclization, thiab lwm yam.
Chemical equation (hypothetical):
Oxidized Intermediate + Reagents → Cyclization Pepper Ring Intermediate
Chloromethylation: Tom qab ntawd, qhov nruab nrab ntawm lub nplhaib kua txob yog raug chloromethylation los qhia chloromethyl pawg, npaj rau cov tshuaj tiv thaiv cyanide tom ntej.
Kev sib npaug tshuaj (piv txwv, tsis ncaj qha mus rau kua txob acetonitrile synthesis):
Pepper Ring Intermediate + Chloromethylating Agent → Chloromethylation Chloromethyl Pepper Intermediate
Ntawm no, chloromethylation reagent tuaj yeem yog qhov sib xyaw ntawm formaldehyde, hydrogen chloride, thiab methanol, tab sis nws nyob ntawm cov qauv thiab kev ua haujlwm ntawm cov kua txob nruab nrab.

Cyanation: Thaum kawg, qhov nruab nrab ntawm chloromethyl kua txob raug rau cov tshuaj tiv thaiv cyanide los tsim piperonyl acetonitrile. Cov kauj ruam no feem ntau yog ua los ntawm kev siv cyanide reagents xws li sodium cyanide (NaCN) lossis potassium cyanide (KCN) raws li cov kuab tshuaj tsim nyog thiab cov xwm txheej.
Chemical Equation:
Chloromethyl Pepper Intermediate + NaCN / KCN → Cyanation Pepperacetonitrile (Pepper Nitrile)
Ua kom tiav txoj kev xaus (hypothetical)
Txawm hais tias cov kauj ruam saum toj no thiab qhov sib npaug yog qhov kev xav, lawv muab lub hauv paus rau kev ua kom muaj peev xwm ntawm piperonyl acetonitrile uas suav nrog cov kauj ruam oxidation. Txawm li cas los xij, hauv cov ntawv thov kev lag luam, kev sib txuas ntawm piperonyl acetonitrile feem ntau tsis cuam tshuam ncaj qha oxidation synthesis, tab sis siv txoj hauv kev ncaj thiab muaj txiaj ntsig, xws li cyclization ntawm catechol nrog dichloroethane thiab sodium hydroxide los tsim piperonyl nplhaib, uas yog npaj los ntawm cov kauj ruam xws li chloromethylation thiab cyanide.

Cov synthesis ntawm kua txob acetonitrile feem ntau pib los ntawm kua txob nplhaib (los yog cov qauv zoo sib xws), uas tuaj yeem tau los ntawm ntau yam - cov kauj ruam ntawm cov khoom siv raw xws li catechol. Tab sis ntawm no, txhawm rau ua kom yooj yim ntawm kev sib tham, peb xav tias twb muaj ib qho tshuaj tsw qab uas muaj qhov tsim nyog C-H daim ntawv cog lus, xws li 1,3-benzodioxolane (los yog nws cov analogues), uas muaj cov pob txha zoo li piperonyl acetonitrile tab sis tsis muaj cyanide (CN) pawg.

Chemical equation: Cov kauj ruam no tsis cuam tshuam ncaj qha rau C-H daim ntawv cog lus, tab sis muab qhov ua ntej rau cov kauj ruam tom ntej, yog li tsis muaj kev sib npaug tshuaj lom neeg.

Hauv C-H daim ntawv cog lus ua haujlwm, feem ntau nws yog qhov yuav tsum tau siv cov khoom siv hluav taws xob zoo, xws li palladium (Pd), rhodium (Rh), lossis iridium (Ir) hloov pauv hlau complexes, uas tuaj yeem xaiv qhib C-H daim ntawv cog lus nyob rau hauv aromatic hydrocarbons thiab hnov ​​mob nrog cyanide qhov chaw (xws li zinc, ide, sodium cyanide) Cov khoom siv piperonyl acetonitrile.
Ar-H + CN- → Pd- catalyst → Ar-CN} + H-
Ntawm lawv, Ar-H sawv cev rau cov tshuaj tsw qab uas muaj cov C-H daim ntawv cog lus tsim nyog, thiab Ar CN sawv cev rau piperonyl acetonitrile lossis nws cov analogues. Nws yuav tsum raug sau tseg tias qhov sib npaug no yog qhov yooj yim heev thiab tuaj yeem koom nrog ntau qhov nruab nrab thiab cov txheej txheem cov tshuaj tiv thaiv nyuaj hauv cov tshuaj tiv thaiv tiag tiag.

Catalysts thiab tshuaj tiv thaiv tej yam kev mob
Catalysts: Feem ntau siv C-H daim ntawv cog lus ua kom cov catalysts suav nrog palladium acetate, rhodium carboxylate, lossis iridium chloride. Cov catalysts no feem ntau yog siv ua ke nrog ligands xws li pyridine thiab phosphorus ligands los txhim kho kev ua si thiab kev xaiv.
Cov kev mob tshwm sim: Cov tshuaj tiv thaiv feem ntau yog ua raws li kev tiv thaiv roj inert (xws li nitrogen, argon), thiab kev xaiv hnyav yog qhov tseem ceeb rau kev ua tiav ntawm cov tshuaj tiv thaiv. Cov kuab tshuaj muaj xws li dichloromethane, toluene, DMF (N, N-dimethylformamide), thiab lwm yam. Cov tshuaj tiv thaiv kub feem ntau txawv ntawm chav tsev kub thiab kub siab (xws li siab dua 100 ° C), nyob ntawm cov khoom ntawm cov catalyst thiab substrate.

Tom qab cov tshuaj tiv thaiv tiav lawm, qhov sib tov yuav tsum raug xa mus rau tom qab -kev kho mob kom cais thiab ntxuav cov khoom lag luam, piperonyl acetonitrile. Qhov no feem ntau suav nrog cov kauj ruam xws li hnyav evaporation, rho tawm, ntxuav, ziab, thiab crystallization. Qee zaum, ntxiv purification ntawm lub3,4- (Methylenedioxy) phenylacetonitrilekuj tseem yuav xav tau kev sib cais chromatographic (xws li kab chromatography).