Selective reduction of alkynes to Z-alkenes using hydrosilane functions immobilized on silica gel
A solid reagent consisting of hydrosilane functions immobilized on the surface of silica gel was used in conjunction with acetic acid and tetrakis(triphenylphosphine)palladium(0) catalyst to effect the reduction of alkynes to Z-olefins. Simple filtration provides a convenient means for the reaction workup and isolation of products.
Kini, Abhay D.,Nadkarni, Durgesh V.,Fry, James L.
p. 1507 - 1510
(2007/10/02)
VINYLLITHIUMS FROM BUTYL VINYL TELLURIDES AND BIS-VINYL TELLURIDES
Butyl vinyl tellurides and bis-vinyl tellurides furnish vinyllithiums with retention of configuration in good yields upon treatment with n-butyllithium at -78 deg C.
Reactions of Carbonyl Compounds with Grignard Reagents in the Presence of Cerium Chloride
The addition of Grignard reagents to ketones is significantly enhanced by cerium chloride with remarkable supression of side reactions, particularly enolization.Some esters, which are prone to side reactions, also react readily with Grignard reagents in the presence of cerium chloride to give normal reaction products in reasonable to high yields.