| Popis: |
NMR spectroscopy has revealed that the reaction between trans,trans,trans- 2,4,6-octatriene and potassium amide at - 60° to - 40° yields the trans- 1-methyl, all-trans heptatrienyl anion. At 0° this anion isomerizes largely to the cis-1-methyl anion. At room temperature the mixture of these two anions electrocyclizes completely to a mixture of 2- and 6-methylcycloheptadieny! anions. The latter two anions are obtained separately from 3-methylcyclohepta-1,4-diene and 5-methylcyclohepta-1,3-diene, respectively. |
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