A direct dicarbon insertion into nine-vertex arachno cages resulting in the formation of C-substituted dicarbollides [7,8-R2-nido-7,8-C2B9H10]− Et3NH+via reactions between 4-Et3N-arachno-B9H13 and alkynes in refluxing toluene (yields 65–85%) is reported.
O. L. Tok, J. Holub, A. Růžička, Z. Růžičková and B. Štíbr, New J. Chem., 2018, 42, 8524 DOI: 10.1039/C8NJ00819A
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