<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands"^^ . "This work is concerned with the synthesis, chemical reactivity, and characterization of new binuclear boron compounds containing bridging guanidinate ligands. The guanidine-borane adducts H3B·hppH and H3B·N(H)C(NMe2)2, accessed by a base exchange reaction between H3B·NMe3 and the guanidine derivative hppH or N(H)C(NMe2)2, were targeted as precursors in thermal and catalytic dehydrogenations. The reaction mechanism for these experiments was elucidated by means of quantum chemical (DFT) calculations on the model H3B·N(H)C(NH2)2. In contrast to H3B·hppH, the thermal dehydrogenation of H3B·N(H)C(NMe2)2 is accompanied by decomposition, leading to methylimino borane oligomers, [HBNMe]n. The decomposition pathway was studied and understood with the aid of quantum chemical calculations. Faster dehydrogenation could be initiated by addition of a catalyst. The dehydrogenation of H3B·hppH in presence of a catalyst leads to the binuclear B(III) hydride [H2B(hpp)]2, containing two guanidinate (hpp)Ligands. Further (reductive) catalytic dehydrogenation of [H2B(hpp)]2 gave the double-base stabilized diborane(4) [HB(hpp)]2, featuring direct B-B bonding. Besides, [HB(hpp)]2 undergoes an oxidative addition reaction with HX (X = Cl- or I-), respectively which afforded [H3B2(hpp)2]X, representing a stable B2H5+ analogues. Quantum chemical (DFT) calculations were carried out to analyse the bond properties in the cationic binuclear B(III) hydride [H3B2(hpp)2]+. The reaction between BCl3 and hppH lead to [Cl2B2(hpp)3]BCl4 containing three guanidinate (hpp) ligands, which suggests that this reaction has a much more difficult mechanism than the H3B·NMe3/hppH reaction. B2Cl2(NMe2)2 reacts with hppH to yield [{(Me2(H)N)B(hpp)}2]Cl2, featuring the first representative of two B(II) cations with direct B-B bonding. Further reactions between [{(Me2(H)N)B(hpp)}2]Cl2 and AgOTf or Li[B(C6F5)4] yielded new salts with weakly coordinating anions. Additionally, thermal decomposition of [{(Me2(H)N)B(hpp)}2]X2 (X = Cl-, OTf- and [B(C6F5)4]-) was investigated on the basis of NMR experiments."^^ . "2009" . . . . . . . . "Oxana"^^ . "Ciobanu"^^ . "Oxana Ciobanu"^^ . . . . . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands (PDF)"^^ . . . "Synthesis_and_Characterization_of_New_Binuclear_Boron_Compounds_with_Bridging_Guanidinate_Ligands.pdf"^^ . . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands (Other)"^^ . . . . . . "indexcodes.txt"^^ . . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands (Other)"^^ . . . . . . "lightbox.jpg"^^ . . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands (Other)"^^ . . . . . . "preview.jpg"^^ . . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands (Other)"^^ . . . . . . "medium.jpg"^^ . . . "Synthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands (Other)"^^ . . . . . . "small.jpg"^^ . . "HTML Summary of #10119 \n\nSynthesis and Characterization of New Binuclear Boron Compounds with Bridging Guanidinate Ligands\n\n" . "text/html" . . . "540 Chemie"@de . "540 Chemistry and allied sciences"@en . .