14.7 g (0.048 mol) of 7-bromo-9,9-dimethyl-9H-fluoren-2-ol, 1.3 g (1.85 mmol) of bis(triphenylphosphine)palladium(II) chloride and 0.5 g (2.6 mmol) of copper(I) iodide are initially introduced in 200 ml of THF and 20 ml of diisopropylamine, and a solution of 9.5 ml (0.13 mmol) of but-3-yn-1-ol in 50 ml of THF is added over the course of 2 h under reflux. When the addition is complete, the batch is heated under reflux for a further 1 h, added to water, acidified using dil. hydrochloric acid and extracted three times with ethyl acetate. The combined org. phases are dried over sodium sulfate, and the solvent is removed in vacuo. Chromatography of the crude product on silica gel with toluene/ethyl acetate (4:1) gives 7-(4-hydroxybut-1-ynyl)-9,9-dimethyl-9H-fluoren-2-ol as colourless oil.
