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- [1] FRAGMENTATION REACTIONS OF CARBONYL-COMPOUNDS WITH ELECTRONEGATIVE BETA-SUBSTITUENTS .22. CIS-4.4.8.8-TETRAMETHYL-2.6-DIOXABICYCLO[3.3.0]OCTANE AND TRANS-4.4.8.8-TETRAMETHYL-2.6-DIOXABICYCLO[3.3.0]OCTANE FROM 1.6-BIS(TOSYLOXY)-2.2.5.5-TETRAMETHYL-3.4-HEXANEDIONE CHEMISCHE BERICHTE-RECUEIL, 1972, 105 (11): : 3553 - &