Compare the yield in Sandmeyer reaction and Gattermann reaction for the introduction of halide or cyanide groups using diazonium salts.

The yield in Sandmeyer and Gattermann reactions for introducing halide or cyanide groups using diazonium salts can vary. Sandmeyer reactions often exhibit higher yields due to the simplicity and efficiency of the process, especially when using copper(I) halides. On the other hand, Gattermann reactions, involving cuprous cyanide, may have lower yields due to the challenges associated with handling toxic cyanide reagents and potential side reactions. The choice between these reactions depends on the specific requirements of the synthesis and the desired functional groups, considering factors like safety, reagent availability, and overall efficiency.