A compound containing four of this functional group is the basis of all chemical indicators used in calcium imaging; that molecule is BAPTA. A class of nucleophilic aromatic substitution involves the reaction of a para-substituted nitro compound with potassium cyanide to place this functional group at the meta position. That is the Von Richter reaction. These compounds, along with the corresponding haloform, are produced when methyl ketones react with halogens in the presence of a strong base. The proton NMR spectra for these compounds often show a singlet at (*) delta 10-12. These compounds undergo a highly reversible reaction with alcohols 
A compound containing four of this functional group is the basis of all chemical indicators used in calcium imaging; that molecule is BAPTA. A class of nucleophilic aromatic substitution involves the reaction of a para-substituted nitro compound with potassium cyanide to place this functional group at the meta position. That is the Von Richter reaction. These compounds, along with the corresponding haloform, are produced when methyl ketones react with halogens in the presence of a strong base. The proton NMR spectra for these compounds often show a singlet at (*) delta 10-12. These compounds undergo a highly reversible reaction with alcohols in both acidic and basic conditions to form esters; that reaction is Fischer esterification. For ten points, name this functional group written COOH.
A compound containing four of this functional group is the basis of all chemical indicators used in calcium imaging; that molecule is BAPTA.