Studies on the manganese-mediated isomerization of alkynyl carbonyls to allenyl carbonyls.
[reaction: see text] A study of the role of base in the isomerization of manganese-coordinated conjugated alkynyl carbonyls to the corresponding allenyl carbonyls is described. The use of phosphine additives indicates that manganese requires a ligand prior to isomerization with amine bases. A series of amine bases were also examined for their efficacy in this isomerization reaction revealing a strong dependence on pK(a). By contrast, potassium tert-butoxide led to rapid isomerization in the absence of added manganese ligand.
Lepore
Salvatore D
SD
Department of Chemistry, Florida Atlantic University, Boca Raton, Florida 33431-0991, USA. slepore@fau.edu
Khoram
Anita
A
Bromfield
Deborah C
DC
Cohn
Pamela
P
Jairaj
Vinod
V
Silvestri
Maximilian A
MA
D002244:Carbon / Q000737:chemistry*; D007536:Isomerism; D008345:Manganese / Q000737:chemistry*
D008345:Manganese; D002244:Carbon