Applying the bent bond / antiperiplanar hypothesis to the stereoselective glycosylation of bicyclic furanosides The glycosylation stereoselectivities for a series of bicyclic furanoside models have been carried out in the presence of weak nucleophiles. These […]
The Bent Bond/Antiperiplanar Hypothesis (aka BBAH) is a conceptually novel orbital model for rationalizing the conformation and stereochemical reactivity of organic molecules containing various types of unsaturation. The BBAH is based on the Slater-Pauling bent […]
Thermal Rearrangement of Optically Active Tetradeuterated-2-methoxymethyl-methylenecyclopropane and the Bent Bond/Antiperiplanar Hypothesis The thermolysis of an optically active tetradeuterated 2-methoxymethyl methylenecyclopropane produces a specific ratio of eight possible rearrangement stereoisomers. Despite numerous efforts, this reaction and […]
Bent Bonds and the Antiperiplanar Hypothesis. A Model to Account for Sigmatropic [1,n]-Hydrogen Shifts Sigmatropic hydrogen shifts are rationalized using the BBAH involving antiperiplanar displacement of radical intermediates. The stereochemistry of both thermal and photochemical […]
High Temperature Isomerization of Benzenoid Polycyclic Aromatic Hydrocarbons. An Analysis through the Bent Bond and Antiperiplanar Hypothesis Orbital Model. The properties and stereochemical reactivity of cyclobutadiene, benzene, cyclooctatetraene and the [10]- to [14]annulenes can be […]
Bent Bonds (τ) and the Antiperiplanar Hypothesis – the Chemistry of Cyclooctatetraene and other C8H8Isomers The fascinating chemistry of cyclooctatraene, including its propensity for ring inversion, bond shifting, and valence isomerization, is analyzed by the […]
The new textbook “Organic Chemistry: Mechanistic Patterns” by Ogilvie, Ackroyd, Browning, Deslongchamps, Lee, Sauer, 1st Ed., Nelson Education, 2017 has been published (ISBN 017650026-X). Organic ChemWare, a collection of 235 HTML5-compliant interactive animations is integrated […]
Bent Bonds and the Antiperiplanar Hypothesis and the Reactivity at the Anomeric Center in Pyranosides A solo contribution from the P. Deslongchamps group. The stereoselectivity of nucleophilic addition on oxocarbenium ions derived from the bicyclic […]
Bent Bonds and the Antiperiplanar Hypothesis – A Simple Model to Rationalize [1,3]-Sigmatropic Alkyl Shifts The bent bond/antiperiplanar (BBA) hypothesis has been applied to the analysis of [1,3]-sigmatropic alkyl shifts. These thermal rearrangements, for which […]
Bent Bonds and the Antiperiplanar Hypothesis as a Simple Model to Predict Diels-Alder Reactivity: Retrospective or Perspective? “Bent bonds paper #2” appears as Perspectives article in Tetrahedron and makes the cover: G.Deslongchamps, P. Deslongchamps, Bent Bonds and the Antiperiplanar Hypothesis as […]
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