- Thermal ring opening of 1,1-dibromo and 1-bromo-2- chloromethylcyclopropanes: Observation of a formal debromochlorination
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When the title compounds are thermolyzed in the gas phase under vacuum or in hot quinoline, several products are formed. A predominant product in all cases is a chlorine-free buta-1,3-diene which has been formed by formal debromochlorination, a reaction n
- Sydnes, Leiv K.,Alnes, Karl F. S.,Pettersen, Anita,Brinker, Udo H.
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experimental part
p. 479 - 483
(2010/06/16)
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- Efficient procedures for 1-bromo-1,3-butadiene and 2-bromo-1,3-butadiene
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Mixtures of Z- and E-1-bromo-1,3-butadiene in which the E- or Z- isomer predominates have been obtained in good yields by treating a mixture of Z- and E-1,4-dibromo-2-butene (90% Z-isomer) or pure E-1,4-dibromo-2-butene, respectively, with powdered potassium hydroxide in high-boiling petroleum. 2-Bromo-1,3-butadiene was obtained in high yields by stirring a mixture of vinylacetylene, concentrated aqueous hydrogen bromide and copper(I) bromide.
- Keegstra,Verkruijsse,Andringa,Brandsma
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p. 721 - 726
(2007/10/02)
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- Process for preparing 1,4-dihydroxy, 5,8-dihydronaphthalene and related compounds
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1,4-dihydroxy, 5,8-dihydronaphthalene and related compounds are provided from benzoquinone, and 1,3-butadiene which may be substituted with halogen, acyl, and alkyl, in a one step reaction in the presence of a ferric salt catalyst.
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