my problem is I got the product before using the second step reagents (HCl, and H2O) so what is the function of the HCl and H2O?
I think HCl and H2
O means dil. H+
, which acts as a catalyst for the process. In case of anhydrides, I think two moles of AlCl3
is required, one mole is used for liberating the acid chloride from the anhydride:
R-CO-O-CO-R + AlCl3
--> RCOCl +RCOOAlCl2
The second mole, forms the sigma complex with C6
OMe and then the O-Al-
might take H+
and liberate one mole of HCl. Then the complex may lose a proton to regain aromaticity, followed by which the Cl may (intramolecular) attack the -AlCl2
, causing breakage of O-Al bond and C-Cl bond through a 4-membered transition state.
This may be possible. I don't really know if all of this is correct or not, since I am a beginner. Hope I could be of some help.