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- W1454091905 abstract "This chapter discusses the synthesis and photochemistry of stereoisomers of retinal. Recently, Because of the availability of better separation methods such as high-pressure liquid chromatography new geometric isomers are now known. Among those containing the 7-cis geometry, five (7-cis, 7,9-dicis, 7,9,13-tricis, 7,13-dicis, and 7,11-dicis) have been isolated and their geometry unambiguously characterized. The two remaining 7-trans isomers (9,11-dicis and 9,11,13-tricis) have also been prepared. Additionally, the 7,11,13-tricis, 8 7,9,11- tricis, and the all-cis isomers 7 of retinonitrile have been synthesized. In 7-cis-retinal preparation from direct irradiation of the all-trans isomer, ethanol is used as a solvent. In synthesis, all-trans-retinal is dissolved in acetonitrile and placed behind filter plate, the solution is irradiated externally with medium-pressure mercury lamp. The irradiated mixture is concentrated by evaporation on a rotary evaporator. The isomers are separated by preparative high-performance liquid chromatography (HPLC) using conditions identical to those for analysis. It is reported that in any organic structure determination, nuclear magnetic resonance spectroscopy is the reliable method for characterizing the stereochemistry of the polyene chain of the retinal isomers because of the nondestructive nature of the method and the increased sensitivity of the newer spectrometers." @default.
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- W1454091905 date "1982-01-01" @default.
- W1454091905 modified "2023-10-15" @default.
- W1454091905 title "[65] Synthesis and photochemistry of stereoisomers of retinal" @default.
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- W1454091905 doi "https://doi.org/10.1016/0076-6879(82)88068-3" @default.
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