The 0.r.d. curves of ca. 40 carotenoids have been measured, chiefly in dioxan, over the range 400-200 nm. The chromophore in all cases is a conjugated polyene system which is perturbed by one or two chiral end-groups.The curves are analysed in terms of the simple additivity of the effects of end-groups, and the absolute configurations of several compounds have been provisionally assigned.MANY carotenoids contain one or more asymmetric carbon atoms, but little information is available concerning the absolute or relative configurations of these centres. Capsanthin (1) has been degraded to the acid (2) which on further oxidation, gave (-)-camphoronic acid (3),2 also obtained from (+)-camphor (4) of known 3 absolute configuration. Since the two oxygen functions This paper is Part LXII in the Westfield College series on optical rotatory dispersion, preceding paper, Part LXI, G.
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