التفاصيل البيبلوغرافية
| العنوان: |
Bulky guanidinate calcium and zinc complexes as catalysts for the intramolecular hydroamination. |
| المؤلفون: |
Barman, Milan Kr1 (AUTHOR), Baishya, Ashim1 (AUTHOR), Nembenna, Sharanappa1 (AUTHOR) snembenna@niser.ac.in |
| المصدر: |
Journal of Organometallic Chemistry. May2019, Vol. 887, p40-47. 8p. |
| مصطلحات موضوعية: |
*ZINC catalysts, *HYDROAMINATION, *NUCLEAR magnetic resonance spectroscopy, *CALCIUM, *SECONDARY amines, *CATALYTIC activity |
| مصطلحات جغرافية: |
CADIZ (Spain) |
| مستخلص: |
Abstract Mixed guanidinato-amido supported complexes of calcium, LCaN(SiMe 3) 2 ∙2THF (1) [L = {ArNC(N i Pr 2)NAr} (Ar = 2,6-Me 2 -C 6 H 3)] and zinc, LZnN(SiMe 3) 2 (2) & L1ZnN(SiMe 3) 2 (3) [L1 = {Ar'NC(N i Pr 2)NAr'} (Ar' = 2,6- i Pr 2 -C 6 H 3)] have been synthesized by salt metathesis method. Reaction between LH or L1H and two equivalents of KN(SiMe 3) 2 in THF and the resultant reaction mixture upon treatment with CaI 2 or ZnCl 2 led to the formation of heteroleptic calcium or zinc complexes. All three compounds (1 – 3) were characterized by multinuclear (1H, 13C, 29Si) magnetic resonance spectroscopy, elemental analysis and single crystal X-ray diffraction methods. Solid state structures confirm that all are monomeric species. Furthermore, we have shown the catalytic application of these complexes for intramolecular hydroamination of amino alkenes. Interestingly, compound 1 exhibits as an excellent pre-catalyst for intramolecular hydroamination of various primary amino alkenes in the absence of any additional activator (co-catalyst). However, both compounds 1 and 2 show very good catalytic activity of hydroamination of various secondary amines in the presence of co-catalyst. Graphical abstract Image 1 Highlights • Intramolecular hydroamination. • Guanidinate complexes of calcium and zinc metals. • Effective catalysts for hydroamination of amino alkenes. • X-ray structures of heteroleptic calcium and zinc complexes. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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