Publication

Site Selectivity and Regioselectivity of the Hetero-Diels-Alder and Cheletropic Additions of Sulfur-Dioxide to a 2,3,6,7-Tetramethylidenebicyclo[3.2.1]Octane Derivative

Pierre Vogel
1993
Journal Articles

Abstract

At -55-degrees-C SO2 adds to 4-[(tert-butyl)dimethylsilyloxy]-1-methoxy-2,3,6,7-tetramethylidenebicyc lo[3.2.1]octane reversibly and selectively onto the s-cis-butadiene moiety at C(2), C(3) giving a single regioisomeric sultine. At -45-degrees-C the cheletropic addition of SO2 occurs selectively giving the monosulfolene attached at C(2), C(3).

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Pierre Vogel
1993
Journal Articles

Abstract

Official source

Related concepts (11)

Cheletropic reaction

In organic chemistry, cheletropic reactions, also known as chelotropic reactions, are a type of pericyclic reaction (a chemical reaction that involves a transition state with a cyclic array of atoms and an associated cyclic array of interacting orbitals). Specifically, cheletropic reactions are a subclass of cycloadditions. The key distinguishing feature of cheletropic reactions is that on one of the reagents, both new bonds are being made to the same atom. In the pericyclic transition state, a small molecule donates two electrons to the ring.

Sulfur dioxide

Sulfur dioxide (IUPAC-recommended spelling) or sulphur dioxide (traditional Commonwealth English) is the chemical compound with the formula SO2. It is a toxic gas responsible for the odor of burnt matches. It is released naturally by volcanic activity and is produced as a by-product of copper extraction and the burning of sulfur-bearing fossil fuels. SO2 is a bent molecule with C2v symmetry point group. A valence bond theory approach considering just s and p orbitals would describe the bonding in terms of resonance between two resonance structures.

Cycloaddition

In organic chemistry, a cycloaddition is a chemical reaction in which "two or more unsaturated molecules (or parts of the same molecule) combine with the formation of a cyclic adduct in which there is a net reduction of the bond multiplicity". The resulting reaction is a cyclization reaction. Many but not all cycloadditions are concerted and thus pericyclic. Nonconcerted cycloadditions are not pericyclic. As a class of addition reaction, cycloadditions permit carbon–carbon bond formation without the use of a nucleophile or electrophile.

Related publications (2)

Site Selectivity and Regioselectivity of the Hetero-Diels-Alder and Cheletropic Additions of Sulfur-Dioxide to a 2,3,6,7-Tetramethylidenebicyclo[3.2.1]Octane Derivative

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Sulfur dioxide mediated one-pot, three- and four-component syntheses of polyfunctional sulfonamides and sulfonic esters: Study of the stereoselectivity of the ene reaction of sulfur dioxide

The hetero-Diels-Alder addition of sulfur dioxide: structure of the first crystalline sultine. Quantum calculations on the conformations of 6-fluoro-3,6-dihydro-1,2-oxathiine 2-oxides