174194-67-3Relevant academic research and scientific papers
Synthesis of cyclic diamino-substituted metal carbene complexes
Liu, Chung-Yuan,Chen, Der-Yi,Lee, Gene-Hsiang,Peng, Shie-Ming,Liu, Shiuh-Tzung
, p. 1055 - 1061 (1996)
A series of heterocyclic metal carbene complexes were prepared by the deoxygenation reaction of M(CO)6 (M = Cr, Mo, W) with RNH(CH2)nN=PPh3 (R = H, Et, Ph; n = 2, 3, 4) to form the corresponding isocyanide complex, which subsequently underwent intramolecular cyclization to give (CO)5M=CN(R)(CH2)nNH in good yields. None of the carbene complex reacted further with amine-phosphinimine RNH(CH2)nN=PPh3 to give the bis(carbene) complex. Deprotonation of the N-H of the carbene complex followed by the reaction of alkyl iodides provided the N-alkylated product. In the case of N-allyl-substituted complexes (CO)5M=CNR(CH2)2N(CH2CH=CH 2) (M = Cr, Mo, W), the carbon-carbon double bond underwent intramolecular ligand displacement of carbonyl ligand to yield the corresponding Π-coordinated complex. Unlike the group VI metal carbonyl complexes, treatment of ReBr(CO)5 with 2 molar equiv of Ph3P=N(CH2)2NH2 provided a bis(carbene) complex fac-(CO)3BrRe(=CNHCH2CH2NH)2. All complexes are characterized by both spectral and elemental analyses. Complexes (CO)5Mo=CNHCH2CH2CH2NH (18) andfac-(CO)3BrRe-(=CNHCH2CH2NH)2 (42) were further characterized by X-ray single-crystal analysis.
