77085-60-0Relevant academic research and scientific papers
SYNTHESIS OF 4-YLIDENEBUTENOLIDES AND 4-OXO-2-ENOIC ACID METHYL ESTERS FROM 5-METHOXY-2-FURYL CARBINOLS
D'Auria, M.,Piancatelli, G.,Scettri, A.
, p. 3071 - 3074 (1980)
5-Methoxy-2-furyl-carbinols (8) were converted by ZnCl2 catalysis into 3:1 mixture of 4-ylidene-butenolides (9) and 4-oxo-2-enoic acid methyl esters (10).The carbonium ion 12 is the key intermediate, the stability of which made the conversion very fast providing high yields.
