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Carotenoids and related compounds. Part XXIX. Stereochemistry and synthesis of the allenic end group. Absolute configuration of zeaxanthin

✍ Scribed by Hlubucek, Joseph R.; Hora, Jiri; Russell, Stephen W.; Toube, Trevor P.; Weedon, Basil C. L.

Book ID: 120308870
Publisher: Royal Society of Chemistry
Year: 1974
Weight: 754 KB
Category: Article
ISSN: 1472-7781
DOI: 10.1039/P19740000848

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## Abstract Starting from the readily available, optically active (4__R__)‐hydroxy‐2,2,6‐trimethylcyclohexanone (2), a new technical synthesis of (3__R__,3′__R__)‐zeaxanthin is described. According to a completely new C~9~+C~2~+C~4~ = C~15~ scheme, the ketone 2 was protected, ethynylated with Li‐ac