Jörg Magull's research while affiliated with Georg-August-Universität Göttingen and other places

... A wide variety of metallasiloxanes have been synthesized and characterized in the literature. [1][2][3][4][5][6][7][8] Metallasiloxanes can be derived from monosilanols, 9,10 silanediols, disiloxanediols, [11][12][13][14][15][16][17][18][19][20][21][22][23][24] silanetriols and silsesquioxanetriols. [25][26][27][28] Molecules of these compounds differ in their structures and the nature of the used metal ion. Among this class of compounds, polyhedral metallasiloxanes rst synthesized in our group hold a specic place. ...

... In contrast, the corresponding alkynyl esters and alkynyl ketones resulted in selective addition to the alkyne triple bond. The cycloaddition of gem-difluorosubstituted NH-azomethine ylides with α,α,α-trifluoroacetophenones has been reported to form 4-fluorooxazolidines [143]. The optimized procedure involved stirring a mixture of the imine 223c, with an excess of trifluoroacetophenone (3o), CBr2F2, Pb filings and tetrabutylammonium bromide, and resulted in isolation of the fluoro-oxazolines 238 after chromatography on silica (Scheme 67, Table 31). ...

... Hydrogenation over Pd/C cleanly furnished a 1:6 mixture of sitosterol epoxides 7a and 7b. Deoxygenation of the saturated epoxides with AlI 3 [13] proceeded rapidly to furnish a good yield of β-sitosteryl [16] furnished exclusively alkene [20], corresponding to the monoepoxide of the Z-isomer of crinosterol [21]. Hydrogenation, followed by deoxygenation of the epoxide as before, furnished campesterol acetate (5). ...

... [7] Even with less acidic amines they undergo a dehydrocoupling reaction to afford the mono-aminated aluminum hydride. [8] Furthermore, they are capable of reducing CO 2 by forming the formate-bridged aluminum hydride dimer. The reduction of the phosphorus ylide Ph 3 P=CH 2 to Ph 2 PMe under formation of the phenyl substituted hydride ( Dipp Nacnac)Al(H)Ph was also reported. ...

... For similar related 1,2,4-diazaphospholide complexes, see: Schmidpeter & Willhalm (1984); Cui et al. (2000); Ding et al. (2001); Kumar et al. (2004Kumar et al. ( , 2005; Zheng et al. (2006); ; Pi et al. (2008Pi et al. ( , 2009. ...

... However, rather than the expected A, the Ge 2 Ru compound [L(Cl)Ge] 2 Ru(CO) 3 (3, vide infra) was isolated in a low yield, irrespective of the stoichiometry. [16] 3893 To understand this reaction in detail, we monitored the reaction of 1 with Ru 3 (CO) 12 in a molar ratio of 3:1 in C 6 D 6 through 1 H NMR spectroscopy at different temperatures. As shown in Figure 1, no appreciable reaction occurred at room temperature (even after 12 h). ...

... Apart from their catalytic functions in enzymes, transition metal clusters also exhibit extremely attractive magnetic properties compared to mononuclear transition metal systems [8,9]. The simplest metallic clusters, known as binuclear complexes, have been the subject of extensively researched and have been carried out in the development of for their potential in developing catalysts and magnetic materials in which the two transition metals interact through antiferromagnetic/ferromagnetic coupling [10][11][12]. Molecules containing Cr-Cr bonded moieties have long attracted the interest of theorists and experimental scientists, primarily because they possess a variety of metal-metal bonds [13][14][15][16]. The simplest molecule containing a Cr-Cr bond is the Cr2 complex which has an exceptionally short bond ...

... Cage metallasilsesquioxanes (CLMSs) [1][2][3][4][5][6][7][8][9] are among objects for the study of principles of interaction of metal ion(s) and organoelement ligands. In the case of CLMSs, silsesquioxane ligands successfully play a role of structural matrix for the formation of high nuclear (e.g., Bi12 [10], Cu9Na6 [11,12], Cu10Cs6 [13], Fe6Na8 [14], Cu16 [15], Mn8Na14 [16] and Cu24 [17]) products. CLMSs have been thoroughly studied as active (pre)catalysts [18][19][20][21][22][23][24], as objects with specific magnetic (spin glass) properties [25,26] as well as pre-products for functional materials and nanoparticles [27][28][29][30][31][32][33][34]. ...

... However, the coordination of two molecules of PMe 3 seems to stabilize the coordination core, as we were able to isolate compounds of the type [ 2 ], wherein the latter case reduction to Mo V is observed under formation of disulfide. 62 Since dimerization, in this case, includes M−S bond formation and breaking, the authors suggest that the tungsten compound resists reduction and dimerization due to the high stability of W−S bonds. ...

... 63 Although the introduction of substituents is synthetically feasible, substituted systems are rather scarce and those known in the literature have been only poorly described. 62 Herein, we utilized a series of S,N-bidentate ligands to probe the influence of electron donation and moderate steric bulk provided by the ligand framework on the OAT reaction rates: a weakly donating pyrimidine-2-thiolate (PymS), a more strongly donating pyridine-2-thiolate (PyS), a similarly strongly donating 4-methylpyridine-2-thiolate (4-MePyS) with a methyl group in a position with little steric influence, a more strongly donating 6-methylpyridine-2-thiolate (6-MePyS) with a methyl group close to the coordinating nitrogen atom, and eventually the best donor 6-tertbutylpyridine-2-thiolate (6-tBuPyS) bearing a sterically demanding substituent next to the coordinating nitrogen atom. ...