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- W2040301565 abstract "Abstract— Upon e--pulse irradiation in nonprotic solvents, all-trans retinol (ROH) and retinylmethyl ether (ROMe) form transient species (τ= 0.5–7μs, λmax=575–590 nm) identifiable as radical anions. Similar species are also formed upon laser pulse photoexcitation of these retinyl derivatives in the presence of N,N-dimethylaniline in acetonitrile. In contrast, electron transfer or attachment to all-trans retinyl acetate (ROAc) and palmitate (ROPa) results in ‘instantaneous’ loss of carboxylate anions from electron adducts giving the retinylmethyl radical (R-, λmax= 395 nm, τk > 100 μ,s); the radical anions in these cases are too short-lived to be detected by nanosecond pulse radiolysis. The lifetimes of radical anions of ROH and ROMe are very sensitive to water and alcohols (e.g. kq= 107M-1 s-1 with methanol as quencher for ROH- in tetrahydrofuran). Based on these findings, the spectral dissimilarity of the one-electron reduction products from ROH and ROAc in alcohols and aqueous micelles becomes explainable in terms of fast formation of protonated radical anions (RH(OH), τ1/2, > 100 μs, λmax=370–375 nm) in the case of ROH and of retinylmethyl radical via loss of AcO- from radical anion in the case of ROAc. In tetrahydrofuran, the complexation of ROH- with cations such as Na+ and Bu4N+ affects the relative importance of its major decay modes, namely, protonation and dehydroxylation, the latter process being significantly enhanced by the presence of Na+." @default.
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- W2040301565 date "1988-01-01" @default.
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- W2040301565 title "TRANSIENT PHENOMENA IN THE PULSE RADIOLYSIS OF RETINYL POLYENES—7. RADICAL ANIONS OF VITAMIN A AND ITS DERIVATIVES" @default.
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- W2040301565 doi "https://doi.org/10.1111/j.1751-1097.1988.tb02697.x" @default.
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