Substituent effects and perturbation of p systems, XXXV. Radical anions of tin-substituted naphthalenes. Zeitschrift fuer Naturforschung, Teil B: Anorganische Chemie, Organische Chemie, (33B)11:1223--1226, 1978. [PUMA: anion;substituent system ESR effect radical pi stannyl stannylnaphthalene;naphthalene anion;stannylnaphthalene]