An alicyclic compound is an organic compound that is both aliphatic and cyclic. They contain one or more all-carbon rings which may be either saturated or unsaturated, but do not have aromatic character. Alicyclic compounds may or may not have aliphatic side chains attached

Simple alicyclic compounds are the cycloalkanes cyclopropane, cyclobutane and cyclohexane. A polycyclic cycloalkane is Decalin. Bicyclic alkanes are norbornene and norbornadiene. Spiro compounds have bicyclic connected through one carbon atom.

The mode of ring-closing in the formation of many alicyclic compounds can be predicted by Baldwin's rules.

Cycloalkenes

The placement of double bonds in many alicyclic compounds can be predicted with Bredt's Rule.

Organic compounds | Organic chemistry