Abstract: The reaction block assembly of the invention comprises a reaction block in which are disposed a plurality of reaction wells. Influent and effluent ducts open at the upper face of the reaction block adjacent each of the reaction wells. These ducts provide communication between each reaction well and a source of reagents and gases and with waste removal means for removal of effluent from the reaction wells. A membrane sheet overlies the upper face of the reaction block to define a pneumatic valve to open and close the duct openings each of the reaction wells to control the input of reagents and gases and effluent flow from the reaction wells. The reaction block assembly preferably includes a temperature control block that underlies the reaction block for control of the temperature in the reaction wells. A waste block underlies the reaction block or, if used, the temperature control block.

Abstract: Apparatus for the synthesis of chemical compounds consists of a housing having a top, front, side and rear walls surrounding and enclosing a reaction table. A track on the rear wall of the housing carries a pair of extending arms on each of which is movably mounted a vertically extendible probe for positioning at various locations over the reaction table. At least on control syringe communicates between the probe and containers for system fluids. A programmable controller is provided for control of the syringe and probes. A reaction block on the reaction table consists of a body having an upper portion and a lower portion and an upper and lower surface and a multiplicity of reaction wells for carrying out the synthesis. Each reaction well is closed at its lower end and open to the upper surface. A flushing conduit is located adjacent each of the well and is in fluid communication with the closed lower end of the reaction well.