Butyraldehyde 3-methoxy

Acetoxy-3-methoxy-2-nitrobenzaldehyde, 3260 4-Acetoxy-3-methoxybenzaldehyde, 3284 f Acrylaldehyde, 1142 4-Azidobenzaldehyde, 2693 f Benzaldehyde, 2727 f Butyraldehyde, 1602 5 -Chloro-2-nitrobenzaldehyde, 2648 4-Chloro-3-nitrobenzaldehyde, 2647... 

Another substitution reaction that is initiated by photochemical hydrogen abstraction is the replacement of the bromine atom in 2-bromo-8-methoxy-l, 4-naphthoquinone by an acyl group757. Irradiation of a solution in benzene of the quinone, butyraldehyde or capraldehyde and pyridine yields mixtures of acylated quinone and acylated hydro-quinone. In the first step, the excited quinone abstracts the aldehyde hydrogen atom and this is followed by bond formation between the acyl radical and C-2 of the quinone. The radical that is formed after departure of a bromine atom may either lose a hydrogen atom and yield acylated quinone or take up a hydrogen atom and become acylated hydro-quinone. 

Methoxy poly(ethylene) glycol butyraldehyde (MW 2,000), mPEG-SH (MW 2,000) (all from Nektar Therapeutics, Huntsville, AL). 

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