As a useful preliminary it is convenient to divide heterocyclic ring systems into two leading groups: (I) systems resulting from simple internal dehydration (or similar condensations) of saturated aliphatic compounds - such compounds are: the internal anhydrides or cyclic ethers of the glycols and t
condensations הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד