ChemInform Abstract: ISOLATION OF 5-OXA-, 5-THIA-, AND 5-(TOSYLAZA)-2,8-DI-TERT-BUTYL-4,6,10,11-TETRAPHENYLTRICYCLO(7.2.0.03,7)UNDECA-1,3,6,8,10-PENTAENES, THEIR HYDROPERCHLORATE SALTS, AND 4-SELENA-2,8-DI-TERT-BUTYL-5,6,10,11-TETRAPHENYLTRICYCLO(7.2.0.03

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