naphthalenyllithium in not given redn. with Li naphthalenide;

hydrogenchloride; sodium hydroxide; naphthalenyllithium in ethylene glycol dimethyl ether react. of SnBr4 with i-Pr3C6H2MgBr followed by treatment with 15percent NaOH (1st intermediate); addn. of concd. HCl (2nd intermediate); dropwise addn. of Li naphthalenide in DME at -78°C, warming to room temp. (3rd intermediate), then to 60°C; recrystn.;

in not given warming to 0°C; detn. of thermal equilibrium between tristannane and distannene by UV and 1H-NMR-spectroscopy;

in tetrahydrofuran addn. of SnCl2 in THF to soln. of org. compd. in THF (0°C, 15 min), stirring (30 min, 0°C); removal of THF (vac.), standing (darkness, 12 h, -18°C), thwaing, extn. of residue (hexane), partial evapn., crystn. (hexane);

in toluene 4 weeks;

1: tetrahydrofuran; 1,4-dioxane 2: toluene View Scheme

in diethyl ether under N2,between 0 and -10°C, partial evapn. under vac., warming to ambient temp., three or four repetitions; when crystals started to form, volume of soln. reduced, kept at -20°C, filtration of trimeric product, recrystn. from minimum quantity of hexane;

in 2-methyl cyclohexane Irradiation (UV/VIS); photolysis of soln. of hexakis(2,4,6-triisopropylphenyl)cyclotristannane in methylcyclohexane at -78°C using Hanovia high-pressure lamp;

in toluene (inert atmosphere); heating the cyclotristannane in toluene to 60°C, addn. of the diazabutadiene in toluene, stirring (2 h); evapn. (vac.), dissoln. (n-pentane), filtration, cooling to -18°C, filtration, concn., crystn. to -18°C, recrystn. (n-pentane); elem. anal.;

Irradiation (UV/VIS); photolysis at -78°C;