Phenylpropiolic acid, C
6H
5CCCO
2H, formed by the action of alcoholic potash on
cinnamic acid dibromide, C
6H
5CHBrCHBrCO
2H,
crystallizes in long needles or prisms which melt at 136–137 °C. When heated with water to 120 °C, it yields
phenylacetylene (C
6H
5CCH).
Chromic acid oxidizes it to
benzoic acid;
zinc and
acetic acid
Acetic acid , systematically named ethanoic acid , is an acidic, colourless liquid and organic compound with the chemical formula (also written as , , or ). Vinegar is at least 4% acetic acid by volume, making acetic acid the main component ...
reduce it to
cinnamic acid, C
6H
5CH=CHCO
2H, whilst
sodium amalgam reduces it to
hydrocinnamic acid, C
6H
5CH
2CH
2CO
2H. Ortho-nitrophenylpropiolic acid, NO
2C
6H
4CCCO
2H, prepared by the action of alcoholic potash on ortho-nitrocinnamic acid dibromide, crystallizes in needles which decompose when heated to 155–156 °C. It is readily converted into
indigo.
References
{{reflist
Phenyl compounds
Alkyne derivatives
Carboxylic acids