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)
%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
}