Imidazole→imidazolidine. Preparation by reduction of [Os(H)(CO)(PPh3)2(PyaiR)]+/0 with NaBH4 and characterisation of the products (PyaiR=1-alkyl-2-{3′-(pyridylazo)}imidazole) - Mondal, T.K.; Mathur, T.; Slawin, A.M.Z.; Woollins, J.D.; Sinha, C. (Journal of Organometallic Chemistry, 2007)