Natural acetylenes. Part XXX. Polyacetylenes from Lactuca(lettuce) species of the liguliflorae sub-family of the compositae

Abstract

Seven C₁₀ polyacetylenes were isolated from Lactuca plumieriGren. and Godr. Dec-1-ene-4,6,8-triyn-3-one 1-hydroxydeca-4,6,8-triyn-3-one, (R)-deca-4,6,8-triyne-1,3-diol, and (R)-trans-1-(3-hydroxy-2-tetrahydro-furylidene)-hexa-2,4-diyne are new compounds and synthetic deca-4,6,8-triyn-1-ol is known. Dehydromatricarianol and its aldehyde are known natural products as also is heptadeca-8,10,16-triyne, now isolated from the garden lettuce, L. sativaL. These are the first polyacetylenes to be found in the Liguliflorae.