Photoinduced Carbonylation of Organic Halides with Low-Valent Rare Earth Reagents under the Atmospheric Pressure of CO and its Mechanistic Aspects

摘要

Under the atmospheric pressure of CO,the photoinduced reductive carbonylation of organic halides(RX)with Smk successfully takes place to provide the corresponding asymmetric ketones(RC(O)CH_2R)in good yields.The present carbonylation involves the formation of acylsamarium species(RC(O)Sml2)as a key intermediate,which undergoes dimerization and subsequent reduction to give the asymmetric ketone.