Reaction of a dialdehyde, particularly phthaldialdehyde (I), with R--Z where Z is a nucleophilic group (preferably SH) and R is polymerisable (e.g. allyl) gives a reactive thioacetal (V) which can react with an amine ligand L--NH.sub.2 to produce an isoindole (IV) which may be fluorescent. At some stage, generally before interaction with L--NH.sub.2, the R groups are polymerised, possibly leading to self-assembly of the polymer on a metal or SH-bearing surface. Such a coated surface is useful as a transducer in assays or as a binding medium e.g. for chromatography. ##STR1##

La reacción de un dialdehyde, particularmente phthaldialdehyde (i), con R--Z donde está un grupo nucleophilic (preferiblemente SH) y R Z es polymerisable (e.g. alílico) da un (v) thioacetal reactivo que pueda reaccionar con un ligand L -- NH.sub.2 de la amina al producto un isoindole (iv) que pueda ser fluorescente. En una determinada etapa, generalmente antes de la interacción con L -- NH.sub.2, los grupos de R se polimerizan, conduciendo posiblemente al uno mismo-montaje del polímero en una superficie del metal o del SH-cojinete. Una superficie tan revestida es útil como transductor en análisis o como medio obligatorio e.g. para la cromatografía. ## del ## STR1

 
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