252981-67-2Relevant articles and documents
Addition of Secondary and Primary Amines to the Allenylidene Ligand of [Ru(η5-C5H5)(C=C=CPh 2)(CO)(PiPr3)]BF4: Synthesis of Azoniabutadienyl, Aminoallenyl, and Azabutadienyl Derivatives of Ruthenium(II)
Bernad, D. Javier,Esteruelas, Miguel A.,López, Ana M.,Modrego, Javier,Carmen Puerta,Valerga, Pedro
, p. 4995 - 5003 (1999)
The allenylidene complex [Ru(η5-C5H5)(C=C=CPh 2)(CO)(PiPr3)]BF4 (1) reacts with diethylamine and piperidine to give the azoniabutadienyl derivatives [Ru(η5-C5H5){C(CH= CPh2)=NEt2}(CO)(PiPr3)]BF 4 (2) and [Ru(η5-C5H5){C(CH=CPh2)=NCH 2(CH2)3CH2}(CO)(PiPr 3)]BF4 (3), respectively. The molecular structure of 2 has been determined by X-ray crystallography. The geometry around the ruthenium center is close to octahedral with the cyclopentadienyl ligand occupying three sites of a face. The Ru-Cα bond length is 2.063(6) A?, whereas the Cα-N distance is 1.306(7) A?. Treatment of 2 and 3 with sodium methoxide produces the deprotonation of the CH=CPh2 fragment to afford the aminoallenyl derivatives Ru(η5-C5H5){C(NEt2)=C=CPh 2}(CO)(PiPr3) (4) and Ru(η5-C5H5){C(NCH2(CH 2)3CH2)=C= CPh2}(CO)(PiPr)3 (5). Complex 1 also reacts with n-propylamine and aniline. In this case, the reaction products are [Ru(η5-C5H5){C(CH=CPh2)=NH nPr}(CO)(PiPr3)]BF4 (6) and [Ru(η5-C5H5){C(CH=CPh 2)=NHPh}(CO)(PiPr3)]BF4 (7). Treatment of 6 and 7 with sodium methoxide produces the deprotonation of the nitrogen atom of the unsaturated η1-carbon ligand, to give the azabutadienyl compounds Ru(η5-C5H5){C(CH=CPh2)=N nPr}(CO)(PiPr3) (8) and Ru(η5-C5H5){C(CH=CPh 2)=NPh}(CO)(PiPr3) (9), respectively. The ellipticities of the Ru-Cα and Cα-N bonds of the model compounds [Ru(η5-C5H5){C(CH=CH2)=NH 2}(CO)(PH3)]+ (10), Ru(η5-C5H5){C(NH2)=C=CH 2}(CO)(PH3) (11), and Ru(η5-C5H5){C(CH=CH2)= NH}(CO)(PH3) (12) have been studied using the AIMPAC series of programs. The obtained values are 0.07 and 0.12 (10), 0.05 and 0.07 (11), and 0.07 and 0.10 (12), respectively.