Pentoses and Hexoses Can Form Stable Ring Structures by Internal

Question

Pentoses and hexoses can form stable ring structures by internal hemiacetal formation.

Accepted Answer

Pentoses and hexoses can form stable ring structures by internal hemiacetal formation through a reaction between a hydroxyl group on carbon 5 or 6 (in the case of hexoses) and the carbonyl group on carbon 1. This results in the formation of a cyclic hemiacetal ring structure.