Key points are not available for this paper at this time.
Beyond the Tolman electronic parameter: The 31P NMR chemical shifts of easily synthesized carbene–phenylphosphinidene adducts allow the determination of the relative π-acceptor properties of carbenes. In combination with the Tolman electronic parameter value, the relative pure σ-donation of carbenes can also be evaluated. As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Back et al. (Thu,) studied this question.