The Hückel Hückel Hauv xyoo 1931, German chemist thiab physicist Erich Hückel tau thov txoj cai los txiav txim siab seb lub nplhaib lub nplhaib yuav muaj cov khoom muaj ntxhiab. Txoj cai no hais tias yog ib lub voj voog, cov qauv qauv muaj 4n + 2π electrons, nws yog aromatic. Txoj cai no yuav raug hu ua Hückel Txoj Cai. https://chem.libretexts.org › Aromaticity › Huckel's_Rule
Hückel Txoj Cai - Chemistry LibreTexts
tus lej rau pyridine thiab pyrimidine yog rau. Rings tsis tas yuav tsum muaj 6-tus tswv cuab thiaj li muaj rau π electrons. … Hauv pyrrole, tus khub ib leeg tuaj yeem xav tias yog nyob ntawm 2pz orbital, thiab yog li ob qho tib si ntawm cov hluav taws xob no ua rau muaj lub suab nrov π..
YPuas yog pyrimidines aromatic?
Pyrimidine yog ib qho aromatic heterocyclic organic compound zoo ib yam li pyridine.
Vim li cas pyridine muaj ntxhiab?
Pyridine yog ib qho tshuaj tsw qab uas muaj cov amine. Cov tshuaj tsw qab yog suav tias yog qhov ruaj khov heev thiab lawv tsuas tuaj yeem dhau mus cov tshuaj tiv thaiv yog tias cov khoom kawg khaws cov aromaticity ntawm lub nplhaib. Lub aromatic compound pyridine muaj peb resonance qauv. Yog li, pyridine yog ib qho tshuaj tsw qab.
Dab tsi ua rau purines muaj ntxhiab?
Purine yog ib qho heterocyclic aromatic organic compound uas muaj ob lub nplhaib (pyrimidine thiab imidazole) fused ua ke. Nws yog dej-soluble. Purine kuj muab nws lub npe rau cov chav kawm dav ntawm cov molecules,purines, uas suav nrog hloov purines thiab lawv tautomers.
YPuas yog pyridine aromatic lossis tsis muaj ntxhiab?
Pyridine muaj qhov sib txuas ntawm rau π electrons uas yog delocalized hla lub nplhaib. Cov molecule yog planar thiab, yog li, ua raws li Hückel cov qauv rau aromatic systems. Nyob rau hauv sib piv rau benzene, lub electron ceev tsis sib npaug zos rau ntawm lub nplhaib, qhia txog qhov tsis zoo inductive nyhuv ntawm nitrogen atom.
