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The interaction of stable 2-RSO2-benzonitrile oxides la--e (R = Ph, Bu t, or PhMeN) with C60 fullerene proceeds at the dovble (6,6)-bond of futlerene as tile [3+21 cycloaddition to form the corresponding isoxazolines 2a--c. The molecular structure of compound 2b was established by X-ray structural analysis. The interaction of C60 fullerene with 2-(5-methyl-4-nitrothiophene)carbonitrile sulfide, which was obtained by thermoiysis of 5-(5 "-methyl-4"-nitro-2 "-thienyl)-1,3,4-oxathiazol-2-one, affords only unstable products.

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A lot of previously unknown derivatives of dithienylperfluorocyclopentene (DTPFCP) were synthesized. It was shown that 2,2′-dialkylsubstituted DTPFCP'S are phtochromes. The quantum yields of forward and backward photochemical reactions and spectral parameters of open and cyclic forms of the photochromes synthesized were measured. An attempt to obtain fluorescing phtochromes by means of introduction of benzoxazolyl, benzthiazolyl and 1,2,4-oxadiazolyl moieties in 5 and 5′ positions of DTPFCP failed; these compounds were synthesized but they do not fluoresce