| Abstract
| - The stable, readily available molybdenum(II) complexes [Mo(CO)4Br2]2 (B) and Mo(CO)3(MeCN)2(SnCl3)Cl (C) have been found to catalyze C−C bond-forming allylic substitution with electron-rich aromatics (e.g., 15 + PhOMe → 62) and heteroaromatics (e.g., 15 + 36 → 88) as nucleophilesunder mild conditions (room temperature, 30 min−3 h). Remarkable is the para-selectivity foranisole, whereas phenol tends to favor ortho-substitution in certain instances. Mechanistic andstereochemical experiments are indicative of Lewis-acid catalysis rather than a metal template-controlled process.
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