Synthesis of photoaffinity labels

The syntheses of diazoacetyl compounds have been described ( 5.8.2). Because pf their potential utility, the synthesis of an ethyl diazomalonyl derivative and an aryl azide precursor of carbenes and nitrenes, respectively, are presented below. 

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Photochemical, heterobifunctional reagents for crosslinking and for the synthesis of photoaffinity labels... 

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