Abstract
60 gm. carefully purified acetaldehyde and 30 gm. copper sulphide, activated by oxidizing a part of its surface into cupric sulphate, were sealed in a tube of Pyrex glass and kept at 15–20° for 24 days. At the end of this time, 60 per cent of the reactant was converted into paraldehyde, which was identified by determining the boiling point, the melting point and the mixed melting point with an authentic sample. In a control experiment without catalyst, 98 per cent of the acetaldehyde could be recovered.
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