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, -
Thermal valence isomerizations: stereochemistry of the 2,4,6-octatriene to 5,6-dimethyl-1,3-cyclohexadiene ring closure
β Scribed by Elliot N. Marvell; Gerald Caple; Bruce Schatz
- Publisher
- Elsevier Science
- Year
- 1965
- Tongue
- French
- Weight
- 221 KB
- Volume
- 6
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
β¦ Synopsis
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-
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The regioseZectivity of the syntheses of phenols via dissymmetrica2 zry salts is found to be related to the difference in steric strain in the products as determined by conformational analysis.
Titanocene hydride derivatives induce the cyclization of 1,2-divinylcyclohexanes to trans-and cis-1-methylene-octahydro-lH-indene and their isomerization to transand cis-3-methyl-3a,4,5,6,7,7a-hexahydro-lH-indene.