21. The iodide leaving group in methyl iodide may cause side reactions , as it is a powerful nucleophile. 22. Several side reactions are known to occur. 23. The ?-hydride elimination can either be a vital step in a reaction or an unproductive side reaction . 24. Another side reaction is the Tishchenko reaction. 25. The use of solvents with low-dielectric constants such as dichloromethane or chloroform can minimize this side reaction . 26. :Side reactions will occur on my electrophile-- it's a condensed amino acid with substituted groups on it. 27. A side reaction is an unwanted chemical reaction taking place that diminishes the yield of the desired product. 28. Side reactions decrease the current efficiency.29. These side reactions can be reduced by only short exposures to the catalyst of the order of 0.0003s. 30. Inevitably, [ 4 + 4 ] photocycloadditions carry the side reaction of [ 2 + 2 ] photocycloadditions.