On the Lewis acid-catalysed reaction of the 2,3-bis(trimethylstannyl)-1-alkene moiety with aldehydes
摘要:
Compounds containing the 2,3-bis(trimethylstannyl)-1-alkene moiety react with aldehydes in the presence of boron trifluoride etherate to give homoallylic alcohols in which the remaining vinylic stannyl moiety has undergone halodemethylation. A mechanistic explanation for this behaviour is presented. NMR studies indicate that the addition proceeds in an erythro-selective manner.
Palladium-catalysed addition of tintin and tinsilicon bonds to allenes
摘要:
Hexamethyl-, hexaethyl- and hexabutyl-ditin add to a variety of allenes in the presence of Pd(PPh3)4; the reaction is reversible. Trimethylsilyltrimethyl- and -tributyl-stannane also add under comparable conditions, the silyl moiety becoming attached to the central carbon atom of the allene skeleton; this reaction is, however, apparently not reversible.