Medicinal chemists test that idea constantly. (Bromomethyl)cyclobutane is a simple reagent with a useful job: it lets chemists attach a cyclobutylmethyl group to something larger. Why is that interesting?
Because a cyclobutane ring isn't just another chunk of carbon. It's a compact four-membered ring with significant ring strain and a very different 3D shape from a flexible straight-chain group.
Global Chemical Database