another example is making salicylaldehyde (not shown above). first, bromoethane reacts with mg in ether. second, phenol in thf converts the phenol into ar-omgbr. third, benzene is added in the presence of paraformaldehyde powder and triethylamine. fourth, the mixture is distilled to remove the solvents. next, 10% hcl is added. salicylaldehyde will be the major product as long as everything is very dry and under inert conditions. the reaction works also with iodoethane instead of bromoethane.