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Reagents and conditions: (a)243 MeCN (for a–c), CDCl3 or CD3CN (for d), CD2Cl2 or CD3CN (for e), rt, 5 min; (b) 1,3-di-t-butylimidazol-2-ylidene, toluene, rt, 1 h; (c) 1,3-di-t-butylimidazol-2-ylidene, toluene, −78 °C, 30 min.
