Abstract
1. Formation of diphenylcarbene (DPC) and the radical pairs which arise as a result of migration of an H atom from the tertiary C-H bonds of the macromolecules into the DPC was recorded during photodecomposition of diphenyldiazomethane into an oligomer of piperylene by EPR at 77‡K. 2. The process of thermal quenching of DPC passes through a stage of formation of radical pairs and is caused by migration of an H atom from the macromolecules of the matrix to the DPC by a tunnel mechanism. 3. The kinetic principles of thermal quenching of DPC were explained by the distribution of the distances between the carbenes and C-H bonds in the macromolecules. The characteristics of this distribution of distances were estimated.
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