A simple and efficient synthesis of norbixin and crocetin diesters is described following the schemes C2 + C2o + C2,=C24 and C3 + C14 + C3 = C20 respectively. By means of the Wittig reaction crocetin di-aldehyde is condensed with a bromoacetic acid ester and a C14-dialdehyde with an α-bromopropionic acid ester. The intermediate tri- phenylphosphorane compounds are crystalline and easily isolated in
分别按照方案C 2 + C 2o + C 2,= C 24和C 3 + C 14 + C 3= C 20,描述了降bi素和藏红花二酯的简单而有效的合成。通过维蒂希反应,将藏红花酸二醛与溴乙酸酯缩合,并将C 14-二醛与α-溴丙酸酯缩合。中间体三苯基磷烷化合物是晶体,容易以纯净状态分离。
Carotenoids and related compounds. Part XX. Structure and reactions of fucoxanthin
作者:R. Bonnett、A. K. Mallams、A. A. Spark、J. L. Tee、B. C. L. Weedon、A. McCormick
DOI:10.1039/j39690000429
日期:——
Fucoxanthin is an allenic carotenoid. Chemical and spectroscopic studies establish its structure as 3′-acetoxy-5,6-epoxy-3,5′-dihydroxy-6′,7′-didehydro-5,6,7,8,5′,6′-hexahydro-β-caroten-8-one (15).
[EN] REGULATING PLANT GROWTH USING A DIAPOCAROTENOID<br/>[FR] RÉGULATION DE LA CROISSANCE DE PLANTES AU MOYEN D'UN DIAPOCAROTÉNOÏDE
申请人:UNIV KING ABDULLAH SCI & TECH
公开号:WO2019180638A1
公开(公告)日:2019-09-26
Embodiments of the present disclosure describe diapocarotenoid plant growth regulators represented by formula (I): R-A-R (I) or a precursor, salt, solvate, stereoisomer or polymorph thereof; wherein R is a monovalent carbonyl moiety selected from the group consisting of aldehydes, ethers, diethers, carboxylic acids, alcohols, and ester carboxylates and A is a bivalent polyene represented by the bivalent moiety -(CRa=CRb)x- wherein x is the number of double bonds in polyene moiety A, and Ra and Rb are, independently, hydrogen, a hydrocarbon, or an alkoxy group, and composition of the diapocarotenoid plant growth regulators in an agronomically acceptable carrier. Methods of regulating plant growth including promoting root development, increasing nutrient uptake, enhancing resistance to abiotic stress factors, invigorating plant growth, increasing plant yield, and increasing plant biomass by applying at least one diapocarotenoid plant growth regulator to a seed, plant propagation material, plant or plant growth medium are also described.
Electronic Decay Constant of Carotenoid Polyenes from Single-Molecule Measurements
作者:Jin He、Fan Chen、Jun Li、Otto F. Sankey、Yuichi Terazono、Christian Herrero、Devens Gust、Thomas A. Moore、Ana L. Moore、Stuart M. Lindsay
DOI:10.1021/ja043279i
日期:2005.2.1
The conductance of carotenoidpolyenes chemically bound at each end to gold contacts has been measured for single molecules containing 5, 7, 9, and 11 carbon-carbon double bonds in conjugation. The electronic decay constant, beta, is determined to be 0.22 +/- 0.04 A-1, in close agreement with the value obtained from first principles simulations (0.22 +/- 0.01 A-1). The absolute values of the molecular