Directing Abilities of Alcohol-Derived Functional Groups in the Hydroformylation of Olefins
作者:Li Ren、Cathleen M. Crudden
DOI:10.1021/jo001751m
日期:2002.3.1
hydroformylation syn to the functional group, which would suggest a directing effect. However, hydroformylation of 3-methylene-1-cyclohexanol derivatives occurs on the face opposite to the directing group in the major isomer. These data, in addition to the results of hydroformylation of 1-methyl-2-methylenecyclohexane, suggest that inherent conformational preferences are of significant importance in determining
Influence of Alkoxy Groups on Rates of Acetal Hydrolysis and Tosylate Solvolysis: Electrostatic Stabilization of Developing Oxocarbenium Ion Intermediates and Neighboring-Group Participation To Form Oxonium Ions
作者:Angie Garcia、Douglas A. L. Otte、Walter A. Salamant、Jillian R. Sanzone、K. A. Woerpel
DOI:10.1021/acs.joc.5b00338
日期:2015.5.1
that do not have an alkoxy group. Rate accelerations are largest when the two functional groups are linked by a flexible cyclic tether. When controlled for the inductive destabilization, an alkoxy group can accelerate acetal hydrolysis by up to 200-fold. The difference in rates of acetal hydrolysis between a substrate where the alkoxy group was tethered to the acetal group by a five-membered ring compared
Acceleration of Acetal Hydrolysis by Remote Alkoxy Groups: Evidence for Electrostatic Effects on the Formation of Oxocarbenium Ions
作者:Angie Garcia、Douglas A. L. Otte、Walter A. Salamant、Jillian R. Sanzone、K. A. Woerpel
DOI:10.1002/anie.201410043
日期:2015.3.2
In contrast to observations with carbohydrates, experiments with 4‐alkoxy‐substituted acetals indicate that an alkoxy group can accelerate acetalhydrolysis by up to 20‐fold compared to substrates without an alkoxy group. The acceleration of ionization in more flexible acetals can be up to 200‐fold when compensated for inductive effects.