What is the 'true boat' conformation?
A cyclohexane (
An alternative conformation is the BOAT conformation (I am afraid my poor google-fu prevents me posting a nice picture, but look at the given website!). Here the cyclohexane ring assumes the shape of a boat. In this conformation, the two, alternate
How to remember all this? Get a set of molecular models, and look at conformers of the cyclohexane ring, and relate them to the website. Not only do you have to be able to use the model, you have to be able to represent the conformation on the printed page - a non-trivial exercise that takes a bit of practice.
For substituted cyclohexanes, e.g. methylcyclohexane, and more so
If I have been unclear, please voice your objections, and I (or someone else) will give it another go.