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Formylation of photochromic 9′-hydroxy-1,3,3-trimethyl-1,3-dihydrospiro[2H-indole-2,3′-3′H-naphtho[2,1-b][1,4]oxazine] with the paraformaldehyde-MgCl2-Et3N system or by the Reimer-Tiemann reaction proceeds at the ortho-position to the hydroxy group to form 10′-formyl derivative.

1. A simple method was proposed for determining the content and composition of cyclic trimers in the polymer according to the NMR spectra. 2. The possibility of using data on cyclic trimers to solve the problem of the mechanism of the polymerization process and the structure of the polymer chain was demonstrated.

1. The presence of a photoeffect in polymers with a system of conjugation was demonstrated in an electrophotographic system, but the value of the photosensitivity is small. 2. The introduction of low-molecular electron acceptor compounds into polymers with a system of conjugation leads to an appreciable increase in the electrophotographic sensitivity. 3. For the donor polymer-acceptor polymer system, an increased photosensitivity is observed, with a simultaneous conservation of film-forming properties and thermal stability. 4. The mechanism of the chemical sensitization of the photoconductivity was studied in a heterophase system of conjugated polymer-electron acceptor compound. In such a system the process consists of sensitization of the organic semiconductor by electron acceptor compounds, adsorbed on its surface with polymer molecules.