1.1: sodium bromide / N,N-dimethyl-formamide / 30 h / 35 °C / Inert atmosphere; Large scale reaction 2.1: bis(acetylacetonate)oxovanadium / ethanol / 26.5 h / 30 - 40 °C / Large scale reaction 3.1: triethylsilane; trifluoroacetic acid / 27 h / 50 - 88 °C / Inert atmosphere; Large scale reaction 3.2: 50 °C / pH 10 - 11 / Large scale reaction 4.1: tris-(dibenzylideneacetone)dipalladium(0); 9,9-dimethyl-4,5-bis(diphenyl-phosphino)xanthene; sodium hydroxide / anhydrous xylene; water / 40 h / Inert atmosphere; Reflux; Large scale reaction 5.1: trifluoroacetic acid / water / 7 h / 95 - 100 °C / Large scale reaction 5.2: 8 h / 60 °C / pH 10 - 11 View Scheme

1: sodium bromide / N,N-dimethyl-formamide / 30 h / 35 °C / Inert atmosphere; Large scale reaction 2: bis(acetylacetonate)oxovanadium / ethanol / 26.5 h / 30 - 40 °C / Large scale reaction View Scheme

Multi-step reaction with 3 steps 1.1: sodium bromide / N,N-dimethyl-formamide / 30 h / 35 °C / Inert atmosphere; Large scale reaction2.1: bis(acetylacetonate)oxovanadium / ethanol / 26.5 h / 30 - 40 °C / Large scale reaction3.1: triethylsilane; trifluoroacetic acid / 27 h / 50 - 88 °C / Inert atmosphere; Large scale reaction3.2: 50 °C / pH 10 - 11 / Large scale reaction