polyphosphoric acid T=110°C; 24 h;

<b>Multi-step reaction with 4 steps<br /> </b>1: N-bromosuccinmide; dibenzoyl peroxide / tetrachloromethane<br />2: ethanol; water<br />3: potassium hydroxide / ethanol<br />4: hydrogenchloride<br /> <br /> &nbsp;

<b>Multi-step reaction with 5 steps<br /> </b>1: dicyclohexyl(2′,6′-dimethoxybiphenyl-2-yl)phosphine; tris-(dibenzylideneacetone)dipalladium(0); potassium phosphate<br />2: N-bromosuccinmide; dibenzoyl peroxide / tetrachloromethane<br />3: ethanol; water<br />4: potassium hydroxide / ethanol<br />5: hydrogenchloride<br /> <br /> &nbsp;