- Copper (II) as catalyst for intramolecular cyclization and oxidation of (1,4-phenylene)bisguanidines to benzodiimidazole-diylidenes
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A synthetically useful approach of catalytic intramolecular cyclization and oxidation of 2′,2′-(1,4-phenylene)bis(1,3-dialkyl)guanidines (Alkyl = isopropyl 1 or cyclohexyl 2) catalyzed by copper acetate in acetonitrile under air was studied by on line mon
- Anti?olo, Antonio,Carrillo-Hermosilla, Fernando,Daniliuc, Constantin G.,Mesias-Salazar, Angela,Nachtigall, Fabiane M.,Rojas, René S.,Santos, Leonardo S.,Trofymchuk, Oleksandra S.
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Read Online
- Heterobimetallic dianionic guanidinate complexes of lanthanide and lithium: Highly efficient precatalysts for catalytic addition of amines to carbodiimides to synthesize guanidines
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A series of heterobimetallic dianionic guanidinate complexes of lanthanide and lithium, [Li(THF)(DME)]3Ln[μ- η2η1(iPrN)2C(NC 6H4p-R)]3 [R=Cl, Ln=Nd (I), Y (II), La (III); R=H, Ln=Nd (IV)] were synthesized and fully characterized. These complexes were found to be highly efficient precatalysts for the addition of various primary and secondary amines, and aromatic and aliphatic diamines to carbodiimides to give the corresponding monoguanidine and biguanidine derivatives under mild condition (at 25-60 °C), which provides an efficient way for the synthesis of biguanidines compounds. The activity depends on the central metals and ligands: La>Nd>Y for the metals and [(iPrN) 2C(NC6H4p-Cl)]2->[( iPrN)2C(NC6H5)]2- for the ligands were observed.
- Zhang, Xingmin,Wang, Chuanyong,Qian, Cunwei,Han, Fubin,Xu, Fan,Shen, Qi
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experimental part
p. 8790 - 8799
(2011/12/02)
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- Highly atom efficient guanylation of both aromatic and secondary amines catalyzed by simple lanthanide amides
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(Chemical Equation Presented) It is demonstrated that the cyclopentadienyl-free simple lanthanide amides [(Me3Si) 2N]3Ln(μ-Cl)Li(THF)3 (Ln = La, Sm, Eu, Y, Yb) and Ln[N(SiMe3)2]3 (Ln = Y, Yb) are highly efficient catalysts for the guanylation of both aromatic and secondary amines with a high activity under mild conditions. It is found that these catalysts are compatible with a wide range of solvents and substrates.
- Li, Qinghai,Wang, Shaowu,Zhou, Shuangliu,Yang, Gaosheng,Zhu, Xiancui,Liu, Yuyu
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p. 6763 - 6767
(2008/02/11)
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