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Conditions: entries 1–6: TFAA (2.5 equiv), MeCN, −40 °C to rt, 18 h; entry 7: TFAA (2.5 equiv), CH2Cl2, −40 to 0 °C, 2 h; entries 8–13: Tf2O (2.5 equiv), CH2Cl2, −78 °C to rt, 18 h.
Crotyl-TMS (E/Z, 5/1), giving mixture (E/Z, 11/1).
Hept-2-en-1-yltrimethylsilane (E/Z, 1/9), giving mixture (E/Z, 17/1).
100 °C MW, 2 h.
60 °C MW, 2 h.
