- PROCESSES FOR SYNTHESIZING ESTERS BY 1,4-ADDITION OF ALKANOIC ACIDS TO MYRCENE OR ISOPRENE
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Processes are disclosed for synthesizing esters useful in flavorings and fragrances from ?-pinene, myrcene and/or isoprene. The esters can be used in the manufacture of citral, precursors to citral and other products or precursors such as vitamins, nutritional supplements, flavorings, fragrances and other products. The process includes a 1,4-addition of an alkanoic acid to the conjugated diene of myrcene (which can be generated from ?-pinene) or the conjugated diene of isoprene to produce esters thereof.
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Page/Page column 16-17
(2008/06/13)
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- TOTAL SYNTHESIS OF VARIOUS ELEMANOLIDES
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Starting with a suitable substituted divinyl cyclohexanone, eleven naturally occurring 12.8-elemanolides bearing exo-methylene or methyl groups at C-11 and differing in substitution as well as in relative configuration, have been synthesized in racemic form.An approach to elemanolides with additional oxygen functionalities is principally possible by modification of the basic concept.Methods for the oxidative generation of terpenoid exo-methylene lactone and furan units are exemplified by synthesis of menthofuran and the p-menthenolides from isopulegols.
- Friedrich, Dirk,Bohlmann, Ferdinand
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p. 1369 - 1392
(2007/10/02)
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- Enamines: Part I - Action of Acetyl Chloride on Citronellal Enamine: Formation of Citronellylidenecitronellal
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Piperidine enamine of citronellal (III) on treatment with acetyl chloride at 0 deg C furnishes α-citronellylidenecitronellal (VII) as a major product.The formation of VII, involving iminium salt as an intermediate, is discussed.
- Rangaishenvi, M. V.,Hiremath, S. V.,Kulkarni, Sheshgiri N.
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