Symmetrical N,N'-disubstituted ureas have been synthesized and characterized. Among them, the branched dialkylureas prepared are highly soluble in organic media. Moreover, the solutions obtained are very viscous in heptane, if the branched alkyl groups are not too bulky (i.e. a methyl group on the alpha carbon, or an ethyl group on the beta carbon). Due to the strong, bifurcated hydrogen bonds between
Organometallic Lewis Acids, Part LXII. Chiral Carbonyl-Cyclopentadienyl-Triphenylphosphine-Iron and -Ruthenium Complexes with Tertiary Nitriles [Cp<i>M</i>(CO)(PPh<sub>3</sub>)(N≡C-C<i>R</i><sup>1</sup><i>R</i><sup>2</sup><i>R</i><sup>3</sup>)]<sup>+</sup>BF<sub>4</sub><sup>-</sup>(<i>M</i>= Fe, Ru)
作者:Christopher U. Missling、Karlheinz Sünkel、Heinz Langhals、Wolfgang Beck
DOI:10.1002/zaac.201700235
日期:2017.11.2
acetonitrile, primary and secondary nitriles, using alkylbromides and sodium amide in liquidammonia. By reaction of the in situ formed organometallic Lewis acids [CpM(CO)(PPh3)](+) (M = Fe, Ru) with the novel tertiary nitriles, the complexes [CpM(CO)(PPh3)(NC C-(CRRR3)-R-1-R-2]BF4 were obtained. A di-iron complex was formed with 1,6-dicyanohexane.