Abstract
In an attempt to clarify characteristic cyclobutane ring frequencies, the infrared spectra of imides and amides derived from cyclobutanecarboxylic acids have been studied. The relative constancy of a 935–900 cm–1 band indicates it to be characteristic of the cyclobutane ring, especially when bands occur at 3000–2800 cm–1. A band at 1250 cm–1 could be the most useful distinguishing spectral characteristic of cyclobutanes. A band due to ring CH at a substitution site appears with great consistency at 2874–2855 cm–1.
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