The two alternative rate-determining steps in benzylic lithiation reactions of esters and Carbamates

Lithiation reactions of tertiary benzylic esters and carbamates have been studied. Kinetic methodology revealed that a two-step reaction pathway should be considered for these reactions, where either the lithium precomplexation and/or the proton transfer steps can be rate determining. Kinetic isotop...

ver descrição completa

Detalhes bibliográficos
Autores: Fernández-Nieto, Fernando, Paleo Pillado, María Rita, Colunga Seara, Roberto, Raposo, María Luz, García Río, Luis, Sardina López, Francisco Javier
Formato: artículo
Fecha de publicación:2016
País:España
Recursos:Universidad de Santiago de Compostela (USC)
Repositorio:Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela
Idioma:inglés
OAI Identifier:oai:minerva.usc.gal:10347/32250
Acesso em linha:http://hdl.handle.net/10347/32250
Access Level:acceso abierto
Palavra-chave:2306 Química orgánica
Descrição
Resumo:Lithiation reactions of tertiary benzylic esters and carbamates have been studied. Kinetic methodology revealed that a two-step reaction pathway should be considered for these reactions, where either the lithium precomplexation and/or the proton transfer steps can be rate determining. Kinetic isotopic effects were evaluated by comparison of the lithiations of the corresponding protio/deutero substrates, and the results obtained support the notion that lithium precomplexation is taking place on the reaction pathway and that it is the rate-determining step in this transformation.