Walsh Cyclopropane is a common topic in upper-level organic chemistry courses, particularly those taught by chemists who (like me) are fascinated by interesting ways of describing bonds.
Cyclopropane is usually described with so-called "banana bonds," which are sp3-hybridized (as shown below left), but A. D. Walsh, in 1947, invented a different way of describing bonding in the molecule. Walsh's model explains several ways in which cyclopropane differs from other saturated hydrocarbons. For example,
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