C,HI4 requires C, 87.3; H, 12.7%). (b) 4,5-cisand aZl-trans-2,3-dimethyZocta-2,4,6-triene (I11 ; n = 1).
[19G4]Notes. 2467and after 4 hr. in diffuse daylight the solution showed an absorption spectrum similar to that of the all-trans-triene, Amax. 276, 287 mp (G 39,300, 30,700). The condensation of the phosphorane (I) and hexa-2,4-dienal (11; n = 2) was carried out as in (a), and, after refluxing of the mixture on a waterbath for 4 hr., the cis-and trans-iomers (111; n = 2) (74%), b. p. 61-74"/0.01 mm., were isolated and isomerised as in (a), to yield the all-trans-tetraene (111; n = 2), b. p. 71-72"/0.03 mm., A , =
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.