prov:value
| - Conveniently, Q??? in formula (3) is present and is a bridging group containing at least one Group 13, 14, 15, or 16 element, in particular boron or a Group 14, 15 or 16 element, and Q??? in formula (3) can be bonded to any bondable ring position of Z. Examples of suitable bridging groups include P(???S)R???, P(???Se)R???, P(???O)R???, R???2C, R???2Si, R???2Ge, R???2CCR???2, R???2CCR???2CR???2, R?
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