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Pyrolysis of stereotopically twisted cyclobutane rings. Stereochemistry of the thermal cleavage of isomeric 5,6-dimethylbicyclo[2.1.1]hexanes to 2,6-octadienes

✍ Scribed by Leo A. Paquette; Michael J. Kukla

Publisher: Elsevier Science
Year: 1973
Tongue: French
Weight: 224 KB
Volume: 14
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)95807-1

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✦ Synopsis

Cyclobutane derivatives which can adopt a planar or nearly planar conformation seemingly experience thermal fragmentation via singlet l,kU.radical intermediates.2'3 In contrast, -

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Thermal valence isomerizations: stereochemistry of the 2,4,6-octatriene to 5,6-dimethyl-1,3-cyclohexadiene ring closure

✍ Elliot N. Marvell; Gerald Caple; Bruce Schatz 📂 Article 📅 1965 🏛 Elsevier Science 🌐 French ⚖ 221 KB

Thermal valence isomerization of conjugated trienes having a central cis double bond to give cyclohexadienes is a well established reaction (1). Most of the known examples involve medium ring trienes, and few pro-