CHM242H5 Lecture Notes - Lecture 3: Cyclohexane, Cyclobutane, Cyclopropane
Document Summary
If #c in ring substituent, then the parent = cycloalkane. Start at the end closer to the branch point/ substituent. If the 1st branch point is the same from either end, use the 2nd branch point as reference. Identify the substituents and write out the name. Large rings (c25 +): almost no diff from open-chain alkanes. Stereoisomers: atoms connected in same order but diff 3d orientation. They have 2 faces b/c of limited rotation & cyclic structure. B/c of eclipsing of bonds between neighboring atoms. B/c of repulsive interactions when atoms approach each other too closely. B/c bond angles are forced to deviate from the ideal 109. 5 tetrahedral value. Nonplanar formations: minimize angle and torsional strain by ring-puckering. Most strained of all rings due to angle strain caused by its c c c (cid:271)ond angles of 60 . Has considerable torsional strain (c h bonds are eclipsed) Weaker and more reactive bonds than typical alkane bonds.
