Titlebook: Cis-tr?ns Isomeric Carotenoids Vitamins A and Arylpolyenes; L. ?echmeister Book 1962 Springer-Verlag Vienna 1962 Conjugated system.Isomer.

Coenzyme

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媒介

Some Properties of , Carotenoidsvertheless it should be pointed out that simple characterizations such as “stable” or “l(fā)abile” have lost much of their meaning in the class of multiconjugated systems. Because the degree of the double bond character is subject to considerable variation along the chain, the extent of liability of a g

myriad

有危險

Geyser

pus840

pus840

蓋他為秘密

Vitamins A and Retinenesnstead of 40. As a special feature they carry functional groups at the end of the aliphatic chain. The structures of the four most important compounds to be discussed appear in the formulas (LI)–(LIV.)

compel

lethal

,-Diphenylpolyenes and Related Compoundsten different routes had been followed. Although the all-. configuration had been proved by X-ray studies for the samples . = 3 and 4 [. and . (.)], the existence of . forms was predicted by . and . (.) (p. 8). In 1939 . and . wrote (.):