Abstract:Indan derivatives Q 1050Rh (I)-Catalyzed CO Gas-Free Carbonylative Cyclization Reactions of Alkynes with 2-Bromophenylboronic Acids Using Formaldehyde. -Paraformaldehyde is used as an CO source in the reaction to afford various indenones [cf. (IV)]. The ratio of the catalysts is crucial. For unsymmetrical alkynes, a sterically bulky or electron--withdrawing group favors the α-position of the carbonyl carbon in the products. The reaction of 2-bromophenyl(trimethylsilyl)acetylene (XVa) with the non-halogenated b… Show more
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