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Heck coupling reactions of iodobenzene and cyclohexene in sub-critical water illustrate the importance of water density as a reaction variable. Altering the water density from 0.03 to 0.84 g/mL and the reaction pressure from 30 to greater than 213 bar at 225 o C changed both product and isomer yields. The multiple physical effects of water density were also explored by the addition of ionic...