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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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    $\begingroup$ That there are two such groups... $\endgroup$ – Mithoron Dec 3 '15 at 23:56
  • $\begingroup$ Why not mention name and author of this book? $\endgroup$ – mykhal Oct 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. $\endgroup$ – Beerhunter Dec 5 '15 at 10:34

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