Abstract The substrate and ligand influence on oligomerisation of terminal hydroxyacetylenes catalysed by rhodium complexes has been studied. In this reaction α-and β-hydroxyacetylenes were compared with each other and with an unsubstituted terminal alkyne. The concentration dependant ligand control with Ph 3 As and Ph 3 P has been compared and different ligand association behaviour is found, because only with Ph 3 As ...