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Stereochemistry fused benzenes

Stereochemistry of the related cyclization of 273 can now be controlled by the choice of reagent to produce either cis- or fraws-fused hydroazulenol 274 or 275. Thus, the use of fluoride anion or sodium naphthalenide results in the exclusive formation of the cis-derivative 274, while heating in benzene leads to the raw.s-fused 275. Lewis or Brpnsted... [Pg.1190]

The simplest member of the class is the [l]-ladderane, a small and familiar strained molecule known as cyclobutane. The strain in a [n]-ladderane increases with the number of fused rings and the introduction of multiple bonds." The [2]-ladderane derivative, Dewar benzene, is highly unstable and converts readily to the conjugation-stabilized counterpart, benzene. Depending on the stereochemistry of bridgehead atoms in the fiised-ring system, [njladderanes... [Pg.635]

The hydrogenation of alkyl-substituted benzenes leads us into areas of stereochemistry that are related to those we have visited in Chapter 7 and the hydrogenation of fused or condensed aromatic ring systems likewise has fascinating stereochemical consequences also akin to those discussed in Section 7.5.3. The reduction of these molecules has mainly been conducted by organic chemists, and mechanistic aspects have scarcely been examined. [Pg.437]


See other pages where Stereochemistry fused benzenes is mentioned: [Pg.460]    [Pg.3]    [Pg.974]    [Pg.74]    [Pg.156]    [Pg.391]    [Pg.189]    [Pg.509]    [Pg.520]    [Pg.183]    [Pg.27]    [Pg.584]   


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Benzene fused

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