20334-52-5Relevant articles and documents
Photochemistry of the Matrix-isolated α,β-Unsaturated Aldehydes Acrolein, Methacrolein and Crotonaldehyde at 4.2 K
Johnstone, Duncan E.,Sodeau, John R.
, p. 409 - 415 (2007/10/02)
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 isomerization to ethylketene and enol-crotonaldehyde, as observed in the analogous gas-phase photolysis.In addition, another H-abstraction product was detected (νOH = 3674 cm-1) which is probably derived from the photolysis of s-cis-crotonaldehyde.At shorter excitation wavelenths (λ > 230 nm) acrolein and methacrolein isomerize to methylketene and dimethylketene, respectively.
Copper(I) Chemical Ionization-Mass Spectroscopic Analysis of Esters and Ketones
Burnier, R. C.,Byrd, G. D.,Freiser, B. S.
, p. 1641 - 1650 (2007/10/02)
The present work lays the foundation for the understanding and evaluation of atomic metal ions as a new class of chemical ionization reagent ions.In particular, a thorough study of the gas phase ion chemistry of Cu(1+), generated by laser ionization from the pure metal, with a series of oxygenated compounds is reported.Definite patterns of reactivity for different classes of oxygenated compounds are observed which, together with an understanding of the reaction mechanisms, provide the basis for predicting the Cu(1+) chemical ionization mass spectra of new compounds with analogous functional groups.The chemistry of Cu(1+) is found to be dramatically different from that of Ti(1+) and Li(1+) reported earlier providing a significant indication of the flexibility and selectivity afforded by atomic metal reagent ions.
