Photochemistry of the matrix-isolated α,β-unsaturated aldehydes acrolein, methacrolein and crotonaldehyde at 4.2 K
作者:Duncan E. Johnstone、John R. Sodeau
DOI:10.1039/ft9928800409
日期:——
The UV photolysis of the α,β-unsaturated aldehydes acrolein, methacrolein and crotonaldehyde in argon matrices at λ > 300 nm has shown a major photochemical deactivation pathway to be conformational isomerism to the thermodynamically less stable s-cis form. This type of isomerization may account for the rapid internal conversion observed in the gas phase. Matrix-isolated crotonaldehyde undergoes further
所述的紫外光解α,β不饱和醛的丙烯醛,甲基丙烯醛和在氩气矩阵巴豆醛λ > 300nm的已呈主要光化学失活途径是象异构成热力学不太稳定的小号-顺式形式。这种类型的异构化可以解释在气相中观察到的快速内部转化。如在类似的气相光解中所观察到的,基质分离的巴豆醛进一步异构化为乙烯酮和烯醇-巴豆醛。此外,检测到另一H-抽象产物(ν OH =3674厘米-1),这可能是由光解得到的小号-顺-crotonaldehyde。在较短的激发波长(λ > 230 nm)下,丙烯醛和甲基丙烯醛分别异构化为甲基-烯酮和二甲基烯酮。