Selective generation of lithiated benzonitriles: the importance of reaction conditions.
Lithiated benzonitriles can be generated in high yields from reactions of bromobenzonitriles with n-BuLi in THF under standard cryogenic conditions (ca. -70 degrees C) provided the reverse addition mode is employed. The resultant aryllithiums are fairly stable at temperatures up to -60 degrees C. The formation of lithiated benzonitriles via Br/Li exchange under normal addition mode conditions is plagued by deprotonation and extensive CN-addition reactions. The generation of related aryllithiums from disilylated bromobenzonitriles is comparatively less sensitive to reaction conditions.
Luliński
Sergiusz
S
Warsaw University of Technology, Faculty of Chemistry, Noakowskiego 3, 00-664 Warsaw, Poland. serek@ch.pw.edu.pl
Zajac
Katarzyna
K