- Heterogeneous catalysis in acetylation of alcohols and phenols promoted by zirconium sulfophenyl phosphonate
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Layered zirconium sulfophenyl phosphonate was found to be an efficient heterogeneous catalyst for the acetylation of alcohols and phenols.
- Curini, Massimo,Epifano, Francesco,Marcotullio, Maria Carla,Rosati, Ornelio,Rossi, Monia
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- MELANIN GENERATION INHIBITOR AND WHITENING AGENT
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PROBLEM TO BE SOLVED: To provide a melanin generation inhibitor and a whitening agent that are excellent in whitening effect and also excellent in safety and temporal stability. SOLUTION: The invention provides a melanin generation inhibitor containing a compound represented by formula [1] as an active ingredient, a whitening agent, as well as a melanin generation inhibiting method and a whitening method by applying such agents to the skin. (R1, R2, R4, and R5 are each independently H, a hydroxyl group, an alkyl group of C1-4, or -O-C(=O)R6; R6 is an alkyl group of C1-4; R3 is H, an alkyl group of C1-4, or -C(=O)R7; and R7 is an alkyl group of C1-8.) SELECTED DRAWING: None COPYRIGHT: (C)2016,JPOandINPIT
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- Synthesis of tetrahydropyranyl diarylheptanoids from Dioscorea villosa
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Concise syntheses of four tetrahydropyranyl diarylheptanoids isolated from Dioscorea villosa have been described. The key features include Prins cyclization to construct the tetrahydropyran cores, Keck asymmetric allylation, and Mitsunobu inversion. Optimization of the Prins cyclization conditions in order to minimize racemization has been described. Our syntheses also confirmed the absolute stereochemistry of the natural products.
- Kantee, Kawalee,Rukachaisirikul, Vatcharin,Tadpetch, Kwanruthai
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supporting information
p. 3505 - 3509
(2016/07/15)
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- Hydroformylation of olefins and reductive carbonylation of aryl halides with syngas formed ex situ from dehydrogenative decarbonylation of hexane-1,6-diol
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A variety of primary alcohols have been investigated as convenient substrates for the ex situ delivery of carbon monoxide and molecular hydrogen in a two-chamber reactor. The gaseous mixture is liberated in one chamber by an iridium-catalysed dehydrogenative decarbonylation of the alcohol and then consumed in the other chamber in either a rhodium-catalysed hydroformylation of olefins or a palladium-catalysed reductive carbonylation of aryl halides. Hexane-1,6-diol was found to be the optimum alcohol for both reactions where moderate to excellent yields were obtained of the product aldehydes. A relatively low pressure of 1.5-2.4 bar was measured in the closed system during the two transformations.
- Christensen, Stig Holden,Olsen, Esben P. K.,Rosenbaum, Jascha,Madsen, Robert
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p. 938 - 945
(2015/02/19)
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- Synthesis of a novel diarylheptanoid isolated from Zingiber officinale
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Syntheses of 4-acetoxy-2,6-disubstituted tetrahydropyrans via Prins cyclisation of homoallylic alcohols with benzylic aldehydes are described and the methodology is applied in the total synthesis of diarylheptanoid 1 confirming both the structure and abso
- Parker, Gregory D.,Seden, Peter T.,Willis, Christine L.
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scheme or table
p. 3686 - 3689
(2009/10/04)
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- Selective acylation of a sterically hindered hydroxyl group of unsymmetrical diols containing a primary hydroxyl group such as 1,5-hexanediol in the presence of silica gel with acetyl chloride
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The selective acetylation of sterically hindered hydroxyl groups of 1,5-hexanediol preadsorbed on silica gel was reported. The relation between the adsorption of the diol on SiO2 and its reactivity for selective acetylation was studied. Results demonstrated that unsymmetrical diols get adsorbed on the surface of SiO2 preferentially via a primary OH group, leaving the non-adsorbed OH group available for reaction.
- Ogawa, Haruo,Ide, Yuko,Honda, Ryoichi,Chihara, Teiji
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p. 355 - 358
(2007/10/03)
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- SELECTIVE ACYLATIONS OF AMINOPHENOLS AND HYDROXYALKYLPHENOLS WITH 1-ACETYL-v-TRIAZOLOPYRIDINE.
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The title triazolide serves as a convenient reagent for highly chemoselective acetylations of aminophenols and hydroxyalkylphenols.
- Paradisi, Mario Paglialunga,Zecchini, Giampiero Pagani,Torrini, Ines
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p. 5029 - 5032
(2007/10/02)
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