| | 2 | Author
| Peter Paetzold, Klaus Delpy, Roland Boese | Requires cookie* | | | Title
| Cyclobutadien-homologe Diazadiboretidine als Liganden von Übergangsmetallen Cyclobutadiene-Homologous Diazadiboretidines as Ligands to Transition Metals  | | | | Abstract
| The sandwich type product CpCoL (lc) and the carbonyl species (OC^FeL (2c), (OC) 4 CrL (3e), (OC) 4 MOL (4b), and (OC) 4 WL (5b) were prepared with diazadiboretidines (RBNR') : (L) as tetra-hapto ligands (a—d: R = Me, Et, Pr. Bu; R' = /Bu; e: R = R' = /Pr). The ligand (/PrBN/Pr) 2 , prepared by a novel catalytic cyclodimerisation of /PrB=N/Pr, undergoes subse-quent cyclodimerisation to the eight-membered ring (/PrBN/'Pr) 4 at ambient temperature, where-as the corresponding cycloreversion occurs at 100 °C. The structure of the complexes (OC) x ML is discussed by means of IR and NMR data and the structures of crystalline 2c and 5d were determined by X-ray crystallography. | | | |
Reference
| Z. Naturforsch. 43b, 839—845 (1988); eingegangen am 3. März 1988 | | | |
Published
| 1988 | | | |
Keywords
| Iminoboranes, Iminoborane-Cyclodimers, Bis(iminoborane)-Metal Coordination Compounds | | | |
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| default:Reihe_B/43/ZNB-1988-43b-0839.pdf | | | | Identifier
| ZNB-1988-43b-0839 | | | | Volume
| 43 | |
| 3 | Author
| Z. Naturforsch | Requires cookie* | | | Title
| Ringerweiterungs-und -Verengungsreaktionen bei BN-Vier-und -Sechsringen | | | | Abstract
| Expansion and C o n tractio n R eactions w ith BN F our-and Six-M em bered Rings Peter Paetzold3 *, J u tta K iesgena, K arl K ra h éa, H ans-U lrich M eiera und R oland Boeseb By the addition o f im inoboranes R B = N R ' (l a -d) to the corresponding diazadiboretidines (R B N R ')2 (2 a -d), a ring expansion is observed, borazines (R B N R ')3 (3 a -d) being formed. The particular im inoborane iP rB =N /P r (la) can be added to the diazadiboretidines 2 c -g to give borazines B3N 3R2R'2/Pr2 with an unsymmetrical set o f ligands. From P hB =N rB u (lj) and (PhBNzBu), (2j), the Dewar borazine 3j' is formed, which crystallizes in the space group P 2,lc. The diazadiboretidines 2 b -i , the borazines 3 b -d ,f , and the Dewar borazine 3e' are split into the corresponding iminoboranes R B =N rB u at 5 0 0 -6 0 0 °C in the gas phase. The molten bo razines 3 b —d ,f and Dewar borazines 3e', j' are contracted to the corresponding diazadiboreti dines 2 b -f , j at 1 6 0 -3 2 0 °C. [Ligands R/R': zPr/zPr (a), Me/zBu (b), Et//Bu (c), Pr/?Bu (d), zPr/ ?Bu (e), Bu/rBu (f), /Bu/zBu (g), /Bu/rBu (h), zBu(M e3Si)N/zBu (i), Ph//Bu (j).] | | | |
Reference
| Z. Naturforsch. 46b, 853—8 (1991); eingegangen am 26. N ovem ber 1990 | | | |
Published
| 1991 | | | |
Keywords
| Iminoboranes, Diazadiboretidines, Borazines, Ring Expansion, Ring Contraction | | | |
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| default:Reihe_B/46/ZNB-1991-46b-0853.pdf | | | | Identifier
| ZNB-1991-46b-0853 | | | | Volume
| 46 | |
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