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In wikipedia, it is written in two different ways.

(C6H5)4BNa and NaB(C6H5)4

Is there not a unique criterion? Or is it chemistry-brach-dependant?

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More than two, in that article: SMILES shows bonding. [B-](C1=CC=CC=C1)(C2=CC=CC=C2)(C3=CC=CC=C3)C4=CC=CC=C4.[Na+].

A brief online survey shows [Alfa, Chemical Book, Fisher, Sigma and NIH prefer metal-last, though most also show the SMILES string.

A few outliers, such as Enmore, Grainger and WebQC, still use the metal-first layout.

The answer might be, "The preferred format is the one chosen by the instructor or administrator."

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