The complex processing of wood, the development of materials having new properties, and research for new delignification processes will increase interest in radical reactions in wood chemistry. Radical intermediate products are formed during aging of paper and products made of wood by the action of sunlight and air oxygen, during grafting of synthetic monomers on wood and its components, in the process of pulp preparation, during combustion, enzymatic processes, etc. That is why the study of this problem and the possibilities of eliminating radical formation during undesirable processes can help to decrease the losses of products made from wood.