Stereochemistry of female-specific normonoterpenes, sex pheromone candidates from the acarid mite, Tyreophagus sp. (Astigmata: Acaridae)
Two normonoterpenes were detected from an unidentified Tyreophagus sp. as new female-specific components. Both planar structures were identified to be 2,6-dimethyl-5-heptenal (1) and 2,6-dimethyl-5-hepten- 1-ol (2) by GC/MS co-chromatography with synthetic 1 and 2. The stereochemistry of 2 was determined to be R by a GC analysis with a chiral column, while that of 1 was presumed to be similar to 2 based on the biosynthetic aspects.
Lipase catalyzed asymmetric synthesis of (R)-melonol
Synthesis of optically pure 2,6-dimethyl-5-hepten-1-ol (melonol) has been attempted using lipases. Among three different lipases tested, pig pancreatic lipase (PPL) is found to be suitable for transesterification of (±)-melonol to afford (R)-(+)-melonol with an enantiomeric excess of 94%.
Syam, Sujata,Rane, Monica D.,Bhat, Sujata V.
experimental part
p. 1308 - 1310
(2009/04/11)
THE DIRECT CONVERSION OF EPOXIDES INTO ALKENES via IODOHYDRINS BY in situ GENERATED HI
Epoxides are easily converted into iodohydrins and alkenes are obtained from either epoxides or iodohydrins by treatment with HI, generated in situ from Ph3P*I2 in moist CH3CN.
Garlaschelli, Luigi,Vidari, Giovanni
p. 251 - 254
(2007/10/02)
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