text: The addition of hexa-methyl-ene-tetramine and water to an aryl halide can produce these compounds, which can also be produced from the hydrolysis of an oxazine.
full_question: The addition of hexa-methyl-ene-tetramine and water to an aryl halide can produce these compounds, which can also be produced from the hydrolysis of an oxazine. The Sommelet reaction and the Meyers synthesis create these compounds, whose simplest version is used alongside sulfuric acid in ecstasy testing kits based on the Marquis reagent. Aryl versions of this functional group can be synthesized by adding carbon monoxide, hydrochloric acid, and aluminum trichloride to a benzene ring in a variant of the Friedel-Crafts reaction named for Gattermann and Koch. These compounds produce a peak at around 9-10 ppm in proton NMR. PCC will selectively oxidize primary alcohols to these compounds, which can be oxidized again to form carboxylic acids. For 10 points, name these compounds that contain a terminal carbonyl group, which are contrasted with ketones.
first_sentence: The addition of hexa-methyl-ene-tetramine and water to an aryl halide can produce these compounds, which can also be produced from the hydrolysis of an oxazine.
raw_answer: aldehydes