Abstract
Intermolecular coupling reactions of Co 2(CO) 6-complexed, γ-ethyl propargyl radicals occurred with higher dl-diastereoselectivity than intramolecular cyclizations of isocarbon analogues (de inter−de intra≤52%). The observed phenomenon was interpreted in terms of a tandem action of two main determinants—sterics and CH/π coordination—with the latter being enabled by the methoxy groups located on the periphery of the aromatic nuclei (4-, 3,4-, 3,4,5-).
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