- Synthesis of novel methoxyether derivative of isopulegol in a packed-bed flow reactor
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8–Methoxymenthan–3–ol was synthesised in a packed-bed flow reactor by the reaction of isopulegol and methanol in the presence of amberlyst-15 dry hydrogen form catalyst. Key parameters that affect isopulegol conversion and 8–methoxymenthan–3–ol formation were investigated and optimised. The reaction was found to be highly temperature-dependent, and to be less dependent of isopulegol: methanol molar ratio. Higher temperatures coupled with rapid flow rates resulted in higher isopulegol conversion. The optimum working temperature in the reactor was 57 °C and a maximum yield of 51.8% of 8–methoxymenthan–3–ol was obtained in 27.4 min at a flow rate of 3.6 cm3/min. Graphic abstract: [Figure not available: see fulltext.]
- Guyo, Upenyu,Hlangothi, Buyiswa G.,Zeelie, Ben
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- Photocaged Hydrocarbons, Aldehydes, Ketones, Enones, and Carboxylic Acids and Esters that Release by the Norrish II Cleavage Protocol and Beyond: Controlled Photoinduced Fragrance Release
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Five families of caged fragrance compounds that allow the storage and release of the following small volatile organic molecules are described: terpene hydrocarbons, aldehydes, ketones, Michael-type α,β-unsaturated enones, and carboxylic acids and esters. These caged molecules are released by photoexcitation via carbonyl-directed hydrogen-transfer processes and subsequent C-C bond cleavage (Norrish Type II) or by didenitrogenation of diazirines.
- Griesbeck, Axel G.,Porschen, Bj?rn,Kropf, Christian,Landes, Agnieszka,Hinze, Olga,Huchel, Ursula,Gerke, Thomas
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p. 539 - 553
(2017/01/25)
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- Liquid-phase noncatalytic oxidation of monoterpenoids with nitrous oxide
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A series of monoterpenoids differing in the number of double bonds and the pattern of their substitution were tested in the liquid-phase noncatalytic oxidation with nitrous oxide (N2O). The structure of olefins has a significant effect on the oxidation route. In the case of terpenoids containing 1,1-disubstituted double bond, nor-carbonyl compounds are formed with high selectivity.
- Romanenko,Starokon',Panov,Tkacheva
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p. 1239 - 1243
(2008/09/17)
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