Heterocyclic free radicals. Part 1. 4,5-Diazafluorene derivatives of Koelsch’s free radical: an EPR and metal-ion complexation study †

Stable Platinum(0) Catalysts for Catalytic Hydrosilylation of Styrene and Synthesis of [Pt(Ar‐bian)(η2‐alkene)] Complexes

“…[Pt(nbe) 3 ], [27] [Pd(p-MeO-C 6 H 4 -bian)(DMFU)], [24] phenyl-bian, [34] p-MeO-C 6 H 4 -bian, [34] p-Br-C 6 H 4 -bian, [34] p-NO 2 -C 6 H 4 -bian, [35] and m,m-(CF 3 ) 2 -C 6 H 3 -bian [35] were synthesized according to published procedures. 4.5-Diazafluoren-9-one [36] was synthesized according to the literature, but was additionally purified using column chromatography [silica, MeOH/dichloromethane (5:95)].…”

A ruthenium(II) allenylidene complex with a 4,5-diazafluorene functional group: A new building-block for organometallic molecular assemblies

“…This route follows the guideline previously established in the laboratory for this type of complex with the Ru(dppe) 2 system [31]. The actual propargylic alcohol 2 used to obtain the allenylidene complex bears a 4,5-diazafluorene group, and was readily obtained from 4,5-diazafluoren-9-one (1) and acetylene [47]. Further reaction of 2 with the 16 electron precursor [RuCl(dppe) 2 ]OTf (3) led to the deep red allenylidene complex 4 bearing the 4,5-diazafluorene terminal group (83%), fully characterized by means of IR, NMR, mass spectroscopies, and elemental analysis [48].…”

A new family of dinuclear Ru(II) polypyridyl complexes containing dibenzo-14-crown-4

“…BL 1 and BL 2 were prepared by the reaction of 4,5-diazafluoren-9-one [7] with cis-diaminodibenzo-14-crown-4 and trans-diaminodibenzo-14-crown-4 [8] in ethanol respectively. BL 3 formed by the condensation of 1,10-phenanthroline-5,6-dione [9] with tetraaminodibenzo-14-crown-4 [10] in methanol under nitrogen atmosphere 1 .…”