# Cyclopentane conformations

What is the energy minimum of cyclopentane conformational diagram: the halfchair or envelope? How does cyclopentane flip?

• Why do you show two C$_s$ envelope conformations? Is not the left one the same as the right after a rotation. As all the 5 possible envelope-half-chairs are equally probable surely only one envelope and half chair is needed ? As thermal energy is approx 2.4 kJ/mol interconversion should be very rapid, I'm guessing but $10^8$ s$^{-1}$ would not be unreasonable. – porphyrin Jul 24 '16 at 12:55