74534-02-4Relevant academic research and scientific papers
STEREO- AND REGIOSELECTIVITY OF THE CATALYTIC SYSTEM MoCl5/SiO2-SnMe4 IN THE REACTION OF METATHESIS AND COMETATHESIS OF OLEFINS AND THEIR FUNCTIONAL DERIVATIVES
Bykov, V. I.,Butenko, T. A.,Finkel'shtein, E. Sh.
, p. 151 - 155 (2007/10/02)
It was shown that the catalytic system MoCl5/SiO2-SnMe4 has almost 100percent regioselectivity with respect to olefins.The stereoselectivity of the system is not a function of the length of the α-olefin chain, temperature, or addition of functional groups (COOEt, Cl).Addition of pentachlorophenoxy and 8-hydroxyquinolyl ligands significantly reduces the activity of the catalytic system with a slight increase in the stereoselectivity with respect to the cis-isomer.
SELECTIVE MIXED COUPLING OF CARBOXYLIC ACIDS (II). -PHOTOLYSIS OF UNSYMMETRICAL DIACYLPEROXIDES WITH ALKENYL-, HALO-, KETO-, CARBOXYL-GROUPS AND A CHIRAL α-CARBON. COMPARISON WITH THE MIXED KOLBE ELECTROLYSIS.
Feldhues, Michael,Schaefer, Hans J.
, p. 4213 - 4236 (2007/10/02)
- Alkenoyl and functionalized alkanoyl dodecanoyl peroxides are prepared in 70 to 97 percent yield and photolyzed at -78 deg C.Thereby 4- to 10-alkenoyl and 4-alkynoyl peroxides afford good yields (56 - 68 percent) of unsymmetrical coupling products.Similarly α- to δ-haloalkanoyl, cholanoyl or 3- and 4-carboxyalkanoyl peroxides can be coupled (40 - 70 percent).The α-chiral diacyl peroxide 1s undergoes the photochemical coupling reaction with 80 percent retention of its configuration.The photolysis of diacyl peroxides at -78 deg C proves to be a favorable supplement of the Kolbe-electrolysis in cases, where the electrolysis fails or produces low yields.
