For manufacturing trans-1,1,2,3,4,4-hexabromo-2-butene by the\nbromination of diacetylene, the diacetylene is first dissolved in residual\nhydrocarbons derived from acetylene manufacture in a solvent containing hydroxyl\ngroups. In a first desorption stage a mixture rich in vinylacetylene is\n...
8.12.6.2.1At carbon of the heterocyclic ring Brominationof 2,3-dihydro-1,4-dithiin11gave the unstable 2,3-dibromo-1,4-dithiane<1998JOC3952>. Chlorination of trifluoromethylated dihydro-1,4-oxathiin74in a methylene chloride solution at room temperature gives a 1:1 mixture oftrans- andcis...
Halogenation of alkenes is an example of a stereoselective reaction.The reaction of Br2, Cl2 and other halogens with alkenes leads to products of anti–addition. A classic example is the bromination of cyclohexene (below), which gives trans-1,2-dibromocyclohexane as a racemic mixture. No cis-...
Maleic acid (cis-2-butene-1, 4-dioic acid, Lide, 2004) and its corresponding methyl ester, dimethyl maleate (DMME) in which the alkene double bond is in conjugation with a carboxyl group, undergo isomerization on treatment with catalytic amounts of aqueous bromine or Br2/CCl4 under UV ...
Maleic acid (cis-2-butene-1, 4-dioic acid, Lide, 2004) and its corresponding methyl ester, dimethyl maleate (DMME) in which the alkene double bond is in conjugation with a carboxyl group, undergo isomerization on treatment with catalytic amounts of aqueous bromine or Br2/CCl4 under UV ...
1. A process for the production of trans 1,1,2,3,4,4-hexabromo-2-butene by bromination of diacetylene, characterised in that the diacetylene from the hydrocarbon residue arising in the acetylene recovery operation is dissolved at a temperature of -20 degrees C to + 20 degrees C and a ...