REGIOCHEMISTRY OF RADICAL-ADDITION TO C-70

The addition of several photochemically generated organic radicals (H- ., CH3., C6H5., CF3. , and C2F5.) to ellipsoidal C-70 was studied by e lectron spin resonance. Three of the five possible isomers of RC(70)(. ) were detected with R = H, CH3 and four with R = C6H5, CF3, C2F5. Arg uments based on relative abundances and on comparisons of hyperfine in teractions and g factors of the RC(70)(.) isomers and of their C-60 an alogs allowed to place the isomers in homologous series and to identif y the sites of radical addition on the C-70 surface leading to each is omer.