... 1962. Vol. 18. pp. ... 1725 (ester) and 1667 cm-l (conjugated C=O> and at 252 rnp (c 12,000) in the 1 RDH Murray, W. Parker and RA Raphael, Tetrahedron 16,74 (1961). ... (21.25 g) was collected, the filtrate concentrated under red press, diluted with a large volume of water and ...