Die dimerisierung von endständigen α-hydroxyacetylenen mit rhodiumkomplexkatalysatoren

Abstract The dimerisation of monosubstituted α-hydroxyacetylenes, which is catalysed by rhodium complexes, yields 1,4-disubstituted vinylacetylenes. The catalyst has been optimized for 3-methylbut-1-yn-3-ol as the substrate by using different ligands. Kinetic measurements were carried out with the monomers 3-methylbut-1-yn-3-ol, 3-methylpent-1-yn-3-ol and 1-ethynylcyclohexan-1-ol. In addition the rates of the dimerisation have been compared with those for a further series of α-hydroxyacetylenes. The by-products from the reaction of 3-methylbut-1-yn-3-ol with [(C 6 H 5 ) 3 P] 3 RhCl as catalyst were determined and the yields of the products compared with those of but-1-yn-3-ol and prop-1-yn-…