Aromatic hydrocarbons qhia kev nqus hauv thaj tsam 1600-1585 cm-1 thiab 1500-1400 cm -1 vim cov roj carbon-carbon stretching vibrations hauv lub nplhaib aromatic.
Cov tshuaj tsw qab nyob qhov twg ntawm NMR?
Spectroscopy Tutorial: Aromatics
Alkyl pawg qhia mus rau sab xis ntawm 3000, aromatic C–H stretches rau sab laug ntawm 3000. Aromatic protons tshwm sim los ntawm 6.5-8.5 hli Benzylic protons yog los ntawm 2-3 ppm.
Koj paub cov tshuaj tsw qab li cas?
A molecule yog aromatic thaum nws ua raws li 4 lub ntsiab lus tseem ceeb:
- Lub molecule yuav tsum yog planar.
- Lub molecule yuav tsum yog cyclic.
- Txhua lub atom hauv lub nplhaib uas muaj ntxhiab yuav tsum muaj p orbital.
- Lub nplhaib yuav tsum muaj pi electrons.
Cov tshuaj tsw qab nyob qhov twg?
Cov tshuaj muaj ob lub nplhaib benzene koom ua ke, xws li naphthalene, kuj pom muaj nyob rau hauv cov roj crude, txawm hais tias lawv tsis tshua muaj ntau dua li cov tshuaj benzene. Aromatic hydrocarbons muaj ntau dua hauv theedua li hauv roj av, tab sis hauv Tebchaws Meskas lawv feem ntau yog tsim los ntawm tom kawg.
Puas hu ua aromatic system?
Ib qho tshuaj tsw qab (los yog aryl) lub nplhaib muaj cov txheej txheem sib khi atoms nrog cov yam ntxwv tshwj xeeb: Lub kaw lus delocalized conjugated π, feem ntau yog ib qho kev sib hloov ntawm ib qho thiab ob daim ntawv cog lus. Coplanar qauv, nrog rau tag nrho cov pab atoms nyob rau hauv tib lub dav hlau. Kev koom tes atoms teem rau hauv ib lossis ntau dua…
