%0 Journal Article %1 Wang.2013 %A Wang, Dongren %A Unold, Joerg %A Bubrin, Martina %A Elser, Iris %A Frey, Wolfgang %A Kaim, Wolfgang %A Xu, Guangjuan %A Buchmeiser, Michael R. %D 2013 %J European Journal of Inorganic Chemistry %K carbene carbene;ruthenium catalyst complex complex;mol complex;polymn crystal metathesis opening photocatalyst photochem prepn ring ruthenium structure triazene %N 31 %P 5462--5468 %R 10.1002/ejic.201301048 %T Ruthenium-triazene complexes as latent catalysts for UV-induced ROMP %V 2013 %X Three novel ruthenium(II) complexes, Grubbs' catalyst analogs, bearing triazene group, RuX2(IMesH2)N,N-diethyl-N'-(2-benzylidene)triazene (IMesH2 = 1,3-dimesitylimidazolin-2-ylidene; 2-4; X = Cl, CF3CO2, C6F5CO2) are prepd. and tested as photo-induced ring-opening metathetic polymn. of cycloalkenes. Single-crystal x-ray structure anal. of compds. 2-4 revealed that the triazene ligand exists in the trans form and that the aryl-connected nitrogen atom of the triazene binds to the ruthenium atom to form a five-membered chelate ring. Compds. 2-4 were applied to the UV-induced ring-opening metathesis polymn. (ROMP) of cis-cyclooctene (5) and dicyclopentadiene (6). Whereas all three precatalysts show pronounced thermal latency in the presence of 5 or 6, only compd. 2 displays significant photo-ROMP activity. The photoreactivity of precatalysts 2-4, which decreases with increasing electron-withdrawing character and with decreasing pKa of the X groups, is discussed and correlated with the x-ray data of 2-4, with low-temp. 1H NMR measurements as well as with cyclovoltammetric measurements. on SciFinder(R)

@article{Wang.2013, abstract = {Three novel ruthenium(II) complexes, Grubbs' catalyst analogs, bearing triazene group, [RuX2(IMesH2)N,N-diethyl-N'-(2-benzylidene)triazene] (IMesH2 = 1,3-dimesitylimidazolin-2-ylidene; 2-4; X = Cl, CF3CO2, C6F5CO2) are prepd. and tested as photo-induced ring-opening metathetic polymn. of cycloalkenes. Single-crystal x-ray structure anal. of compds. 2-4 revealed that the triazene ligand exists in the trans form and that the aryl-connected nitrogen atom of the triazene binds to the ruthenium atom to form a five-membered chelate ring. Compds. 2-4 were applied to the UV-induced ring-opening metathesis polymn. (ROMP) of cis-cyclooctene (5) and dicyclopentadiene (6). Whereas all three precatalysts show pronounced thermal latency in the presence of 5 or 6, only compd. 2 displays significant photo-ROMP activity. The photoreactivity of precatalysts 2-4, which decreases with increasing electron-withdrawing character and with decreasing pKa of the X groups, is discussed and correlated with the x-ray data of 2-4, with low-temp. 1H NMR measurements as well as with cyclovoltammetric measurements. [on SciFinder(R)]}, added-at = {2019-07-15T13:41:23.000+0200}, author = {Wang, Dongren and Unold, Joerg and Bubrin, Martina and Elser, Iris and Frey, Wolfgang and Kaim, Wolfgang and Xu, Guangjuan and Buchmeiser, Michael R.}, biburl = {https://puma.ub.uni-stuttgart.de/bibtex/26f537615479a34e54e6be3d9fe678bda/b_schwederski}, doi = {10.1002/ejic.201301048}, interhash = {1b4b008cb80b6da302fac44caec3edfa}, intrahash = {6f537615479a34e54e6be3d9fe678bda}, issn = {1434-1948}, journal = {European Journal of Inorganic Chemistry}, keywords = {carbene carbene;ruthenium catalyst complex complex;mol complex;polymn crystal metathesis opening photocatalyst photochem prepn ring ruthenium structure triazene}, number = 31, pages = {5462--5468}, timestamp = {2019-07-15T11:42:10.000+0200}, title = {Ruthenium-triazene complexes as latent catalysts for UV-induced ROMP}, volume = 2013, year = 2013 }