102. Die absolute Konfiguration des natürlichen ä-Tocopherols: 4. Mitteilung)

Bioactive constituents from the green alga Caulerpa racemosa

“…The absolute configurations at C-13 and C-17 on the side chain of 8 were tentatively proposed to the same as those of a-tocopherol. 29,30 However, considering the different configuration at C-9 of the co-occurring known a-tocopheroids, a-tocospiro A (7) 18 and a-tocospirone (10), 20 the configuration of only one chiral center (C-9) in the ring for 8 remains undefined, although the crosspeaks of CH 3 -9a/H-8a and H 2 -10/H-8b in the NOESY spectrum (Fig. 3) were observed.…”

A year away to 100th year of vitamin E synthesis

“…In the year 1963, attempts toward asymmetric synthesis of α‐tocopherol had been made by Mayer et al through cyclization of α‐tocopheryl hydroquinone 10 [52]. They made a hypothesis that the methyl group at the C‐2 position of the chroman ring might be having 2 R configuration.…”

Structure and behavior of nanoparticulate catalysts based on ultrathin chitosan layers

“…These catalysts were tested in selective hydrogenation of dehydrolinalool (3,7-dimethyloctaen-6-yne-1-ol-3, DHL) to linalool (3,7-dimethyloctadiene-1,6-ol-3, LN). LN is a fragrance and an intermediate in the syntheses of Vitamins A and E [26,27], geraniol, citral [28] and exhibits antimicrobial activity [29]. The pathways of DHL and LN transformations are presented in Scheme 1.…”