One form of these compounds is produced by the disproportionation of aldehydes in the Tischenko reaction. A mild reducing agent used in (15[1])transfer hydrogenations of imines is named for Arthur Hantzch and this functional group. In the Yamaguchi reaction, TCBC forms an anhydride that is then catalyzed by DMAP to form this functional group. Polymers with this functional group can be formed from DMT and ethylene glycol. The (10[1])(*) Dieckmann cyclization reacts one of these compounds to produce (10[1])their “beta-keto” type. Cyclic forms of these compounds are known as (10[1]-5[1])lactones. Refluxing a carboxylic acid with an alcohol produces one of these (10[1])compounds in a reaction named for Fischer. For 10 points, name this functional (10[1])group with general formula R-C-O-O-R-prime and a fruity aroma. (10[1]0[2])■END■