Tellurium as Six‐Electron Donor‐Synthesis and Structure of μ₃‐Te[Mn(CO)₂(η⁵‐C₅H₅)]₃

Abstract

the spectrum of the f3( 1 +4) linked disaccharide peracetate lop, however, 3-H appears at lower field (6=5.18) and 4-H at higher field (6 = 3.87), i. e. an acetyl group is located on C-3 in the lyxo building unit, and the interglycosidic bond is different from that in the B-A part of 2. In contrast, in the p(1-3) linked, acetylated derivative 88 3-H (6 = 4.16) and 4-H (6= 5.21) show only slight deviations in the chemical shifts compared to those of the B-A fragment of 2 . Hence, in mithramycin 1 there is a p(1-3) linkage between the D-arabino-(€3) and the D-lyxo-building unit (A).

The Interface of Main Group and Transition Metal Cluster Chemistry

“…3 8 The product is CO,(CO),(~~-S~CO(CO),) and has been characterized by X-ray analysis. Silicon, as a number of other main group atoms, poses certain synthetic problems since it has a strong tendency to bind to oxygen and interactions with carbonyl ligands may complicate desired metalcentered reactions.…”

“…Thus Ge,H6 reacts with Co,(CO), to give a complex formulated as Ge,Co,(CO),, of unknown structure which loses CO producing Co,(CO), 1(p4-GeCo(C0),),.134Reports of PR groups capping square faces of metal clusters are more numerous than those of germanium and can be accessed by a number of routes. The rhenium clusters Re6( CO)8 (p,-PMe), and Re (CO) , , ( p,-PMe)( p-PM ez)( p,-PRe( CO) 5 ) are obtained from the reaction of Re,Cl,(CO), ,{MePP(Me)PMe} with Re,(CO),, at 230-250°C.48…”

Synthese und Reaktivität von [{(CO)5Cr}3Pb]2−, einer ungesättigten Verbindung mit trigonal-planar koordiniertem Blei

“…B. L n M (CO) 4 Fe, E In, x 3; [1] L n M (CO) 4 Fe, E Sn, Pb, x 2; [2] L n M (CO) 5 Cr, E Sn, x 2; [3] L n M (CO) 5 Cr, E Sb, x 1; [4] L n M Cp(CO) 2 Mn, E Te, x 0 [5] ) sind im weitesten Sinne isoelektronische Analoga zu wohlbekannten Vier-Zentrensechs-p-Elektronen-Systemen wie NO 3 À und CO 3 2À . Geburtstag gewidmet Verbindungen A, die ein Hauptgruppenelement in trigonal planarer Umgebung an drei übergangsmetallorganische 16-Valenzelektronenbausteine L n M gebunden enthalten (z.…”

“…[3], 207 (1 mmol Beim Versuch, das (2Z,7Z)-9-Chlor-2,7-nonadienylcarbamat 1 der Lithiierung und einer anschlieûenden asymmetrischen Lithium-En-Reaktion zu unterwerfen, [3] entdeckten wir eine effiziente Neunringsynthese, die selbst in 0.15 m Lösung innerhalb von 2 h nahezu nebenproduktfrei verläuft. Die Umsetzung von 1 mit n-Butyllithium/(À)-Spartein 2 [5] in Toluol bei À 88 8C lieferte das (1R,2Z,7Z)-2,7-Cyclononadienylcarbamat 4 in 73 % Ausbeute und mit 88 % ee (e.r. [3] 1 wurde aus bekanntem cis,cis-Nona-2,7-dien-1,9-diol [4] aufgebaut (Schema 1).…”

Metal Telluride Clusters — From Small Molecules to Polyhedral Structures

“…Another example of the incorporation of Te 0 from 2 into a Lewis acid metal fragment was observed in the reaction of 2 with [(C 5 H 5 )Mn(CO) 2 (THF)], which gave [{(C 5 H 5 )Mn(CO) 2 } 3 (μ 3 ‐Te)] in 80% yield 25. This complex, which was first synthesized 1983 by Herberhold et al, possesses a trigonal‐planar Te center 26…”