Cov kab hlau qhib ntawm cov piam thaj cyclizes thaum C-5 hydroxyl pawg tawm tsam cov pa atom ntawm C-1 aldehyde pawg los tsim ib qho intramolecular hemiacetal. Ob daim ntawv anomeric, xaiv α thiab β, tuaj yeem ua rau.
Vim li cas piam thaj Cyclize?
1: Daim ntawv cyclic ntawm cov suab thaj yog daim ntawv nyiam hauv cov kua dej. Glucose thiab lwm yam 5C thiab 6C suab thaj tuaj yeem cyclize los ntawm intramolecular nucleophilic nres ntawm ib qho ntawm OH ntawm carbonyl C ntawm aldehyde lossis ketone Cov tshuaj tiv thaiv intramolecular tshwm sim yog tias ruaj khov 5 lossis 6 tus tswv cuab lub nplhaib tuaj yeem tsim..
Vim li cas cyclization tshwm sim?
A cyclization tshwm sim thaum 376 yog rhuab nrog p-toluenesulfonic acid (PTSA) muab cov folate analog 377 (Equation 140).
Dab tsi yog qhov ua rau Mutarotation?
qhov tshwm sim no, hu ua mutarotation, yog qhov tshwm sim txawm tias muaj suab thaj zoo ib yam thiab yog tshwm sim los ntawm ib hom stereoisomerism uas cuam tshuam nrog tsim ib qho chaw asymmetrical ntawm thawj carbon atom (aldehyde carbon) hauv aldoses thiab Qhov thib ob (keto carbon) hauv ketoses
txheej txheem cyclization yog dab tsi?
: tsim ntawm lub nplhaib hauv tshuaj lom neeg.
