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Infrared, ultraviolet,  1 H and  13 C nuclear magnetic resonance spectra were recorded for the title compounds. The infrared carbonyl-band frequencies and intensities, and the H 5  chemical shifts, of planar acetophenone, 2-acetylfuran, 2-acetylthiophen and 2-acetylselenophen indicate the order Phenyl &lt; 2-Furyl &lt; 2-Thienyl &lt; 2-Selenyl for Aryl-carbonyl conjugation. Ultraviolet K-band absorption coefficients and carbon-13 chemical shifts provide an estimate of the twisting angle in the pivaloyl derivatives.

A Spectroscopic Study of Pivalophenone, 2-Pivaloylfuran, 2-Pivaloylthiophen and 2-Pivaloylselenophen, and their Sulphur Analogues