For other uses, see
Tempo (disambiguation). For the automobile, see
Ford Tempo.2,2,6,6-Tetramethylpiperidine-1-oxyl or TEMPO is the
chemical compound with the formula (CH2)3(CMe2)2NO. This
heterocycle is a red-orange, sublimable solid. As a stable
radical, it has applications throughout chemistry and biochemistry. TEMPO was discovered by Lebelev and Kazarnowskii in 1960. It is prepared by oxidation of
2,2,6,6-tetramethylpiperidine. TEMPO is widely used as a radical trap, as a structural probe for biological systems in conjunction with
electron spin resonance spectroscopy, as a reagent in
organic synthesis, and as an initiator in polymer chemistry. The stability of this radical is attributed to the steric protection provided by the four
methyl groups adjacent to the nitroxyl group.
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In
musical terminology, tempo (
Italian for "time", from
Latin Tempus) is the speed or pace of a given
piece. It is an extremely crucial element of sound, as it can affect the mood and difficulty of a piece.The plural of tempo in Italian is tempi. Some writers employ this plural when writing in
English. Others use the native English plural tempos. Standard dictionaries reflect both usages.
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