Amino Groups on Resin

A test for secondary amines (e.g. proline) is the Chloranil test (1 drop of a 2% acetaldehyde solution in DMF, followed by one drop of a 2% solution of p-chloranil in DMF, leave for 5 mins). A positive test gives blue stained beads. 

Other tests for the detection of amino functionalities on solid supports include the TNBS (2,4,6-trinitrobenzenesulfonic acid, picrylsulfonic acid) [Hancock and Battersby Anal Biochemll 260 1976], the DABITC [Shah et al. Anal. Commun. 34 325 1997] and the NF31 [Madder et al. Eur J Org Chem 2787 7999] tests. 

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