919364-35-5Relevant academic research and scientific papers
Heteroacene Synthesis through C?S Cross-Coupling/5-endo-dig Cyclization
Oechsle, Peter,Fl?rke, Ulrich,Egold, Hans,Paradies, Jan
, p. 18559 - 18563 (2016)
Highly efficient, one-step synthesis of sulfur-containing heteroacenes was achieved through palladium-catalyzed C?S cross-coupling of bis-alkynes with thioacetate as hydrogen sulfide surrogate. Heteroacenes consisting of three, five, and seven fused aromatic rings were obtained in a single catalytic step by four-, six-, and eightfold C?S bond formation.
Two-photon photosensitized production of singlet oxygen: Sensitizers with phenylene-ethynylene-based chromophores
McIlroy, Sean P.,Clo, Emiliano,Nikolajsen, Lars,Frederiksen, Peter K.,Nielsen, Christian B.,Mikkelsen, Kurt V.,Gothelf, Kurt V.,Ogilby, Peter R.
, p. 1134 - 1146 (2007/10/03)
(Chemical Equation Presented) Singlet molecular oxygen (a 1Δg) has been produced and optically monitored in time-resolved experiments upon nonlinear two-photon excitation of photosensitizers that contain triple bonds as an integral part of the chromophore. Both experiments and ab initio computations indicate that the photophysical properties of alkyne-containing sensitizers are similar to those in the alkene-containing analogues. Most importantly, however, in comparison to the analogue that contains double bonds, the sensitizer containing alkyne moieties is more stable against singlet-oxygen-mediated photooxygenation reactions. This increased stability can be advantageous, particularly with respect to two-photon singlet oxygen imaging experiments in which data are collected over comparatively long time periods.
