Carbon Nanotubes (CNTs) chemistry is under constant evolution, as a consequence of the deep interest
of the scientific community in finding new applications for these versatile materials. New and old synthetic protocols
are used for improving the control of the functionalization degree of the final materials and for offering to scientists
the possibility to fine-tune their final properties. In this Review, we focus the attention on radical reactions,
a class of protocols characterized by small number of steps, different degrees of functionalization and enhanced
solubility of the final modified CNTs, in the desired environment. The most well-known protocols are analysed
providing some relevant examples appeared in the literature in the last years, monitoring the new application fields
and giving insights into their mechanism in order to explain why these protocols are considered standard procedures for a wide number of
scientific groups.
