- Facile synthesis of isodamascone and its analogs
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Synthesis of isodamascone and its analogs, the commercially important aroma compounds, have been accomplished from the readily available 1,5,5-trimethyl-2-cyclohexen-1-ol via a short, facile, and simple sequence of reactions in excellent yield. Copyright Taylor & Francis Group, LLC.
- Rangnekar, Dinesh W.,Kulkarni, Vikas S.,Ranade, Prasad V.,Sabnis, Ram W.
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p. 425 - 430
(2007/10/03)
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- Activity of copper- and iron-containing catalysts in the reaction of isophorone with ammonia and hydrogen
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An investigation has been made of the vapour-phase reaction of isophorone (3,5,5-trimethyl-2-cyclohexen-1-one) with ammonia and hydrogen at a temperature of 160-230°C on an oxide copper-zinc-aluminium catalyst SNM-1 and a reduced, promoted, sintered iron catalyst. The composition of the main reaction products has been established, and schemes of their formation are proposed.
- Shuikin,Glebov,Marchevskaya,Kliger,Zaikin
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p. 174 - 179
(2007/10/03)
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- 172. β-Cleavage of Bis(homoallylic) Potassium Alkoxides. Two-Step Preparation of Propenyl Ketones from Carboxylic Esters. Synthesis of ar-Turmerone, α-Damascone, β-Damascone, and β-Damascenone
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The transformation of 36 bis(homoallylic) alcohols VII to alkenones IX and X via β-cleavage of their potassium alkoxides VIIa in HMPA has been investigated (cf.Scheme 2).These studies have established an order of β-cleavage for 2-propenyl, 1-methyl-2-propenyl, 2-methyl-2-propenyl, 1,1-dimethyl-2-propenyl, and benzyl groups in alkoxides 49a-56a and have allowed a comparison between the β-cleavage reaction and the oxy-Cope rearrangement in alkoxides 74a-83a.As illustrative synthetic applications, a two-step preparation of propenyl ketones 15-42 from carboxylic esters is described, together with syntheses of ar-turmerone (48), α-damascone ((E)-71), β-damascone ((E)-109), and β-damascenone ((E)-111).
- Snowden, Roger L.,Linder, Simon M.,Muller, Bernard L.,Schulte, Karl H.
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p. 1858 - 1878
(2007/10/02)
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