13832-89-8Relevant articles and documents
Reassociation of all-trans-3,4-dihydroanhydrorhodovibrin with lh1 subunits isolated from rhodospirillum rubrum: Selective binding of all-trans isomer from mixture of cis- and trans-Isomers
Yamamoto, Mai,Horibe, Tomoko,Nishisaka, Yoshiaki,Suzuki, Shuichi,Kozaki, Masatoshi,Fujii, Ritsuko,Doe, Matsumi,Nango, Mamoru,Okada, Keiji,Hashimoto, Hidek
, p. 121 - 128 (2013)
The reassociation of carotenoids with the photosynthetic light-harvesting 1 (LH1) pigmentprotein complex has proven to be a powerful technique to investigate the function of carotenoids. We have recently investigated the reassociation of the carotenoids, spirilloxanthin (number of conjugated C=C bonds (n) = 13), anhydrorhodovibrin (n = 12), rhodopin (n = 11), and spheroidene (n = 10)) with carotenoid-depleted LH1 subunits isolated from Rhodospirillum rubrum. In the case of the rhodopin complex, small anomalies were observed in the absorption maximum of the Qy band of bacteriochlorophyll a (BChl a Qy) and the singletsinglet energy-transter efficiency of 1carotenoid 1BChl a within the LH1carotenoid complex. The reason for these anomalies could probably be ascribed to the rhodopin hydroxy group. To investigate this further, reassociation experiments of the LH1 complex with hydroxy-protected rhodopin, all-trans-3,4-dihydroanhydrorhodovibrin (1), were conducted. We observed a normal absorption maximum (883 nm) of the BChl a Qy band in the LH11 complex. The energy-transter efficiency of 1carotenoid (11)1BChl a was found to be 53%, giving a good correlation with the other carotenoids. Furthermore, we found a preferential complexation of alltrans- 1 to carotenoid-depleted LH1 from a 1:1 mixture of all-trans-1 and cis-1 (cis-1 consists of a 1:1 mixture of 5-cis-5- trans-1 and 5-trans-5-cis-1).
Method for preparing vitamin A and vitamin A ester
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Paragraph 0061; 0063; 0067; 0069; 0073; 0075, (2020/04/17)
The invention provides a novel method for preparing vitamin A and vitamin A ester by taking farnesol as a raw material. The method comprises the following steps: carrying out oxidation reaction on farnesol and oxygen under the action of a catalyst and a cocatalyst to generate farnesal; carrying out dehydrogenation reaction on farnesal to generate dehydrofarnesal; carrying out cyclization reactionon the dehydrofarnesal under the catalysis of acid to generate a cyclized intermediate; carrying out a reaction on the cyclized intermediate with chloroisopentenol to generate vitamin A; carrying outan esterification reaction on vitamin A to generate vitamin A ester. The method avoids the defects of an existing process, and the process line is economical and effective.
Base-induced decarboxylation of polyunsaturated α-cyano acids derived from malonic acid: Synthesis of sesquiterpene nitriles and aldehydes with β-, φ-, and ψ-end groups
Dufossé, Laurent,Cartier, Dominique,Valla, Benoist,Fouillaud, Mireille,Labia, Roger,Valla, Alain
, p. 259 - 265 (2013/03/28)
Catalytic base-induced decarboxylation of polyunsaturated α-cyano-β-methyl acids derived from malonic acid led to the corresponding nitriles 3 (Schemes 2 and 3), 6 (Scheme 5), and 9 (Scheme 6). This decarboxylation occurred with previous deconjugation of
