Boat Conformation
In the basic boat conformation (C2v symmetry), carbons C2, C3, C5 and C6 are coplanar, while C1 and C4 are displaced away from that plane in the same direction. Bonds C2-C3 and C5-C6 are therefore parallel. In this form, the molecule has two perpendicular planes of symmetry as well as a C2 axis. The boat conformations have higher energy than the chair conformations. The interaction between the two flagpole hydrogens, in particular, generates steric strain. There is also torsional strain involving the C2-C3 and C5-C6 bonds, which are eclipsed. Because of this strain, the boat configuration is unstable (not a local minimum of the energy function).
Read more about this topic: Cyclohexane Conformation
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