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-connected meta -carboranyl moiety as compared to its C1-based analogue. This work suggests that the B9-functionalized meta -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.
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Spokoyny et al. (2012) studied this question.
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