143097-25-0Relevant academic research and scientific papers
Synthesis and characterization of bis(amidate) rare-earth metal amides and their application in catalytic addition of amines to carbodiimides
Cheng, Hao,Xiao, Yang,Lu, Chengrong,Zhao, Bei,Wang, Yaorong,Yao, Yingming
, p. 7667 - 7671 (2015)
Two new bis(amidate) lanthanide amides {LLn[N(SiMe3)2]·THF}2 (H2L = N,N′-(cyclohexane-1,2-diyl)-bis(4-tert-butylbenzamide); Ln = Sm(4), Yb(5)), which were prepared by the treatment of the bridged amide proligand H2L with Ln[N(SiMe3)2]3 in tetrahydrofuran, had been characterized by single-crystal X-ray diffraction and elemental analyses. Both complexes 4 and 5 and the three known isomorphs {LRE[N(SiMe3)2]·THF}2 (RE = La(1), Nd(2), Y(3)) were successfully employed in the addition of amines to carbodiimides for the first time and were found to be efficient catalysts in the transformation at 60°C under solvent-free conditions. The Nd-based catalyst 2 showed the highest reactivity and provided various guanidines with good functional group tolerance in high to excellent yields.
Titanacarborane mediated C-N bond forming/breaking reactions
Shen, Hao,Xie, Zuowei
scheme or table, p. 1652 - 1657 (2009/10/11)
Constrained-geometry titanacarboranes [σ:η1:η5-(OCH2)(R2NCH2)C2B9H9]Ti(NR2) (R = Me, Et) are synthesized via an unexpected reaction of [Me3NH][μ-7,8-CH2OCH2-7,8-C2B9H10] with Ti(NR2)4 (R = Me, Et), involving a C-O bond cleavage and C-N bond formation. These complexes can be readily converted to new amide species or alkoxide by reacting with amines or esters, respectively. Insertion of a series of unsaturated molecules into the Ti-N bond of the aforementioned complexes results in the formation of various half-sandwich titanacarboranes. [σ:η1:η5-(OCH2)(Me2NCH2)C2B9H9]Ti(NMe2) is also able to efficiently catalyze the hydroamination of carbodiimides and the transamination of guanidines. These results are summarized in this brief account.
Cyclic guanidines; IV. Intramolecular nucleophilic aromatic substitution of hydrogen in (3-nitrophenyl)guanidines
Esser,Pook
, p. 596 - 601 (2007/10/02)
Cyclization of substituted (3-nitrophenyl)guanidines is achieved in basic medium by nucleophilic displacement of hydrogen. The reaction offers a new route to benzimidazoles as well as to tricyclic imidazo-, pyrimido- and diazepino-benzimidazoles with unco
