I have come across this notation in a question I am trying to answer and am unsure of what exactly it means, can anyone clarify what this represents?
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4$\begingroup$ That there are two such groups... $\endgroup$– MithoronDec 3 '15 at 23:56
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$\begingroup$ Why not mention name and author of this book? $\endgroup$– mykhalOct 16 '18 at 10:11
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That ‘curve’ is a bracket, and the whole thing is a shorthand notation for ‘two of the same group’.
Thus, the molecule could be termed bis-(3-methylbut-2-yl)borane.
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$\begingroup$ The trivial or common name is disiamylborane, with the di- confirming the above, that there are two alkyl groups attached to the BH. $\endgroup$ Dec 5 '15 at 10:34