Abstract
From 2,2′,6,6′-tetra-tert-buty1-4,4′-bispyrylium perchlorate by the action of aqueous solutions of sodium acetate or caustic soda we have obtained a spiran containing pyran and dihydrofuran rings the structure of which has been established by the x-ray structural method. It has been shown that under the same conditions sodium sulfide reduces the bispyrylium salt to 2,2′,6,6′-tetra-tert-butyl-4,4′-bispyranylidene. For the product of the interaction of the bispyrylium salt with aqueous ammonia the structure of an unsaturated tetraketone is suggested. Possible mechanisms of the formation of the compounds mentioned are discussed.
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