Pulsed-Laser Induced Chain Addition Reaction of Butanal to Diethyl Maleate | Zendy

R. Stringat | Zendy; G. Fabre | Zendy; M. Alessandri | Zendy; Roland Fellous | Zendy

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Pulsed-Laser Induced Chain Addition Reaction of Butanal to Diethyl Maleate

Author(s) -

R. Stringat,

G. Fabre,

M. Alessandri,

Roland Fellous

Publication year - 1994

Publication title -

laser chemistry

Language(s) - English

Resource type - Journals

eISSN - 1026-8014

pISSN - 0278-6273

DOI - 10.1155/1994/82368

Subject(s) - chemistry , aldehyde , radical , adduct , photochemistry , quantum yield , yield (engineering) , nucleophile , medicinal chemistry , organic chemistry , catalysis , physics , materials science , quantum mechanics , metallurgy , fluorescence

By irradiation of a 5/1 mixture of butanal and diethyl maleate with a pulsed Nd-YAG laser (10 Hz, 13 ns), frequency tripled (λ = 355 nm), diethyl butanoyl succinate is formed by addition. The quantum yield is greater than 1 which means that a chain mechanism occurs which was not the case in previous studies with a mercury lamp. The quantum yield is a function of light intensity and can reach 280 in the range explored (I = 3020 to I = 0.303 KW.cm-2). The excited aldehyde produces the two radicals nPr-ĊHOH and nPr—ĊO. The nucleophilic acyl radical reacts on the diethyl maleate to form an intermediary radical which givs the adduct and a new acyl radical in the presence of an aldehyde molecule. The second radical nPr—ĊHOH captures a hydrogen from the aldehyde producing another acyl radical and butanol.

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