Derivatives of this compound that unexpectedly form in solid crystals of cinnamic (“sih-NAM-ick”) acid spurred the development of the topochemical postulate. A derivative of this compound is the intermediate destroyed by retro-aldol cleavage in the de Mayo reaction. A dimerization that forms this compound is the simplest reaction that requires a Möbius twist on p orbitals so that there is one suprafacial and one antarafacial component. 1,4-diradicals recombine to form a derivative of this compound in a type II (“two”) Norrish reaction. A metal replaces a carbon atom in this compound in the intermediate of olefin metathesis (“muh-TATH-uh-siss”). Under light, but not heat, alkenes like thymine dimerize to form derivatives of this compound in a [2 + 2] (“two plus two”) cycloaddition. This compound has bond angles of 88 degrees because it puckers into a butterfly configuration to reduce ring strain. For 10 points, name this cyclic alkane containing four carbons. ■END■
ANSWER: cyclobutane [prompt on C4H8; reject “butane”; reject “cyclobutadiene”]
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= Average correct buzz position