FC(F)(F)S(O[Si](C)(C)C)(=O)=O.C[Si](C)([O:16][CH2:17][CH2:18][O:19][Si](C)(C)C)C.[C:25]1(=O)[CH2:29][CH:28]=[CH:27][CH2:26]1.C(N(CC)CC)C.C(=O)(O)[O-].[Na+]>C(Cl)Cl>[O:16]1[C:28]2([CH2:27][CH:26]=[CH:25][CH2:29]2)[O:19][CH2:18][CH2:17]1
To a solution of trimethylsilyl trifluoromethanesulfonate (CAS number 27607-77-8; 0.22 ml, 1.22 mmol) in DCM (12 ml) at −78° C. was successively added 2,2,7,7-tetramethyl-3,6-dioxa-2,7-disilaoctane (CAS number 7381-30-8; 2.51 g, 12.18 mmol) and cyclopent-3-en-1-one (CAS number 14320-37-7; 1 g, 12.18 mmol). The reaction mixture was stirred at −78° C. for 3 hours, quenched with triethylamine (2 ml, 14.35 mmol), poured into a saturated solution of sodium bicarbonate and extracted with diethyl ether. The organics were dried over sodium sulfate, filtered and concentrated in vacuo to afford the title compound.
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