Related Experiment Video
Updated: Mar 13, 2026

Preparation of 6-aminocyclohepta-2,4-dien-1-one Derivatives via Tricarbonyltroponeiron
Published on: August 12, 2019
B(C6F5)3-Catalyzed transfer 1,4-hydrostannylation of α,β-unsaturated carbonyls using iPr-tricarbastannatrane
Eric Fillion1, Azadeh Kavoosi1, Kevin Nguyen1
1Department of Chemistry, University of Waterloo, 200 University Ave W., Waterloo, ON N2L 3G1, Canada. efillion@uwaterloo.ca.
Abstract:
Tris(pentafluorophenyl)borane, B(C6F5)3, has been found to be an effective catalyst to access the hydridoborate anion, [N(CH2CH2CH2)3Sn][HB(C6F5)3], via hydride abstraction from the hypercoordinated tin reagent, iPr-tricarbastannatrane. This process has been applied to the B(C6F5)3-catalyzed transfer 1,4-hydrostannylation of electron-deficient olefins, namely benzylidene barbituric acids. Insights into the mechanism have been obtained via a series of 1H, 2H, 11B, 13C, and 119Sn NMR spectroscopy, mass spectrometry, and labeling experiments.
More Related Videos
Related Concept Videos
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration
Hydroboration-Oxidation of Alkenes
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis
Regioselectivity and Stereochemistry of Hydroboration
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn stereochemistry.

