title: Extremely Electron-Rich, Boron-Functionalized, Icosahedral Carborane-Based Phosphinoboranes.
abstract: We have prepared the first examples of B9-connected trivalent aryl and alkyl phosphinoborane species via Pd-catalyzed phosphination of 9-iodo-meta-carborane. Our studies highlight the unique electronic features of the B9-connectedmeta-carboranyl moiety as compared to its C1-based analogue. This work suggests that the B9-functionalizedmeta-carboranyl substituent in these ligands exhibits more electron-releasing character than any other known carbon-based substituent, ultimately laying the foundation for a new class of phosphine ligands with extremely electron-rich character.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, United States.
authors.forename: Alexander M
authors.initials: AM
authors.lastname: Spokoyny
authors.forename: Calvin D
authors.initials: CD
authors.lastname: Lewis
authors.forename: Georgiy
authors.initials: G
authors.lastname: Teverovskiy
authors.forename: Stephen L
authors.initials: SL
authors.lastname: Buchwald