| http://www.w3.org/ns/prov#value | - After being separated from unreacted starting material and other by-products, the squaric acid derivative VI is treated with an acid, for example hydrochloric acid, to convert it to the desired squaric acid derivative I. Although it is possible to simply add acid to the reaction mixture resulting from the treatment of the diester with the organometallic reagent, this course is not recommended, sin
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