- Bromine-magnesium exchange in gem-dibromocyclopropanes using Grignard reagents
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Reaction of gem-dibromocyclopropanes with ethylmagnesium bromide at ambient temperature leads to very high yields of allenes; when cyclopropylidene-allene ring opening is suppressed, alternative carbenic products are observed, although other reactions compete. When the reactions are carried out at -60°C, a 1-bromo-1-(bromomagnesio)-cyclopropane is formed which may be trapped by a number of electrophiles.
- Baird, Mark S,Nizovtsev, Alexey V,Bolesov, Ivan G
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p. 1581 - 1593
(2007/10/03)
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- REACTIONS OF gem-DIBROMOCYCLOALKANES WITH METHYLLITHIUM
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In the reaction of 7,7-dibromonorcarane with methyllithium tricyclo2,7>heptane, 7-(1-ethoxyethyl)bicycloheptane, and 7,7-bisnorcaranylidene are formed, and the proportions of these depnd on the reaction temperature.Substituted gem-dibromobicycloheptanes react analogously. 6,6-Dibromobicyclohexanes substituted in the 1 position react with methyllithium with the formation of 3,12-disubstituted tricyclo2,7>dodeca-2,12-dienes.
- Molchanov, A. P.,Kalyamin, S. A.,Kostikov, R. R.
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p. 102 - 107
(2007/10/02)
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- GENERATION OF CYCLOPROPYLIDENES FROM GEM-DIHALOPROPANES UNDER ULTRASONIC IRRADIATION
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Cyclopropylidenes can be generated much quickly by reactions of gem-dihalocyclopropanes and metals (Li, Na or Mg) under ultrasonic irradiation.The reactions usually complete in 5-15 min at room temperature.
- Xu, Linxiao,Tao, Fenggang,Yu, Tongyin
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p. 4231 - 4234
(2007/10/02)
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