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In the mechanism for Lucas' Test for Alcohols, I am reading two different types. One says the first step is the abstraction of a proton from HCl, but on other references, I also see that the first step is the formation of a zinc chloride complex. Anyone can clear this out for me? Thanks

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  • $\begingroup$ The first step is the formation of the complex $\ce{ZnCl4^{2-}}$. Then the alcohol reacts with this complex and makes a new intermediate complex having two new bonds, one Zn-OH, and one Zn-R. Later on, Zn would go back to a tetra-coordinate complex, by keeping the OH group, then loosing R and one Cl atom, which produces R-Cl. $\endgroup$ – Maurice Dec 14 '20 at 10:54
  • $\begingroup$ See this question and the question linked in the comments. $\endgroup$ – Nilay Ghosh Dec 14 '20 at 11:29