(4S,5S)-1,3-Bis(2,2-diphenylethyl)-4,5-diphenyl-4,5-dihydro-1H-imidazol-3-ium Tetrafluoroborate CAS 1033618-41-5

Cov tshuaj no feem ntau yog siv los ua ib qhoprecursor rau chiral N-heterocyclic carbene (NHC) ligandshauv asymmetric catalysis. Nws cov txheej txheem nruj thiab cov txheej txheem loj loj tso cai rau nws tsim cov chiral carbenes ruaj khov uas ua haujlwm zoo nrog cov hlau hloov pauv xws li palladium, kub, thiab rhodium. Cov hlau-carbene complexes yog dav siv nyob rau hauv asymmetric transformations nrog rau hydrogenation, cycloaddition, allylation, thiab cross-coupling tshua, uas yog ib qho tseem ceeb nyob rau hauv lub synthesis ntawm enantiomerically ntshiab tshuaj, zoo tshuaj, thiab tej yam ntuj tso khoom. Tsis tas li ntawd, tetrafluoroborate ntsev daim ntawv txhim kho cov solubility hauv polar thiab organic solvents, ua kom yooj yim rau homogeneous catalytic systems. Cov khoom siv kuj tseem siv rau hauv kev kawm thiab kev tshawb fawb kev lag luam rau kev tshawb nrhiav cov txheej txheem catalytic tshiab, chiral ligand tsim, thiab kev tshawb fawb txog kev siv tshuab ntawm NHC- cov tshuaj tiv thaiv kev sib kho.

Lub compound muab cov txiaj ntsig tseem ceeb vim nwsrigid chiral moj khaum, steric bulk, thiab siab reactivity raws li NHC precursor. Lub (4S,5S)-stereochemistry muab tau zoo-txhais chirality, ua rau siab enantioselectivity hauv asymmetric catalytic cov tshuaj tiv thaiv. Qhov loj diphenylethyl thiab phenyl substituents tiv thaiv qhov chaw carbene, ua kom lub thermal thiab tshuaj stability ntawm cov hlau-carbene complexes. Nws cov tetrafluoroborate counterion ua kom cov solubility thiab yooj yim ntawm kev tuav, thaum lub zuag qhia tag nrho cov qauv tso cai zoo -tuning ntawm hluav taws xob thiab steric zog los optimize catalyst kev ua tau zoo. Cov yam ntxwv no ua rau nws muaj kev ntseeg siab thiab muaj txiaj ntsig zoo ntawm chiral NHCs rau ob qho chaw kuaj- nplai synthesis thiab kev siv catalytic kev lag luam, ua kom muaj txiaj ntsig zoo, rov tsim dua tshiab, thiab xaiv tau.