Parallel synthesizers are the next step in scale up from our React-7 models where larger quantities of typically liquid phase reactions can be handled in parallel mode. Top mounted stirrers allow viscous reactions and high Temperature and Pressure conditions can be safely studied along with corrosive reagents due to wide variety of Materials of Construction. These reactors are the best choice for an experimental design program to optimize synthesis conditions and also for screening catalysts. Gas pressures can be independently varied for each reactor and jacketed as well as coil cooling and heating is possible along with automatic data logging and PID control. Process development teams often use these to close material balance models and evaluate the change in heat and mass transfer from mL to L scales.