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From literature, it was described that fluorene can react with NCS and conc. HCl to produce the 2,7-diCl derivative. Please help me understand the mechanism.

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  • $\begingroup$ I'd always suggest checking the original paper, rather than relying on the one-liner summary from SciFinder / Reaxys. Since you're on SciFinder, it shouldn't be too many extra clicks. $\endgroup$ – orthocresol Jul 6 at 11:52
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According to this paper here

it has been described recently that at very low pH (Ph < 3) Cl2 functions as an active chlorinating agent

In the authors' view the system works by NCS oxidising chloride to chlorine which then provides Cl+ as the chlorinating agent.

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