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DMF (99.8, Fluka) was stored over molecular sieves. GC-MS measurements were carried out on an Agilent HP6890 instrument with MS detector 5937 N using an Optima 1 MS (Macherey-Nagel) 30 m x 0.25 mm capillary column with H 2 as carrier gas. NMR data were measured on Bruker DPX 300 and AC 250 instruments. Chemical shifts (δ) are given in ppm relative to the solvent reference as the internal standard. Reactions under microwave irradiation were performed in a CEM Discover instrument (300 W) in glass tubes with temperature and pressure control. Preparation of the Reagent (LiSEt, In a dry 500-mL Schlenk flask a solution of n-BuLi (1.3 M) in hexane (120 mL, 160 mmol) was diluted with hexane (150 mL) under an argon atmosphere. The solution was cooled to 0 °C and under rapid stirring EtSH (200 mmol, 1.25 equiv, 15 mL) was added dropwise, whereupon a white precipitate formed. The reaction mixture was stirred at 0 °C for 10 min and at r.t. for 30 min. After
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+, 219 (95), 217 (97), 191 (46), 189 (55), 173 (29), 171 (31), 110 (14), 67 (41).
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