Abstract
Alkynes and allene interacted with copper oxide powder at temperatures as low as 150 °C and formed paramagnetic species (PMS). The maximum amount of PMS is formed at about 300 °C. The formation of PMS depended on the pressure of the alkynes. These PMS were stable up to 350 °C and then decomposed or polymerised. The intensity of ESR signals dropped drastically as soon as PMS came into contact with air or oxygen. However, on removing the oxygen from O 2-adsorbed PMS by evacuating, the ESR signal reappeared in almost its original shape and intensity. A possible mechanism for the formation of radicals is discussed.
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