Eine neue Klasse von Tantal(v)‐dithiolat‐Komplexen: Synthese und Charakterisierung von [Ta(η⁵‐C₅Me₄R)(SCHCHS)₂] (R=Me, Et) und [Ta(η⁵‐C₅Me₅)(SCH₂CH₂S)₂]

Abstract

Tabelle 2. Aktivierungsparameter und Spannungsverlust fiir die intramolekulare [4 + 2]-Cycloreversion van Basketen und seinen Homologen. Verb. logA [a] E, [a] AG" (130°C) A&, [kcal/mol] [kcal/mol] [a] [kcal/mol] 1 13.2 [I] 29.7 [I] 29.8 [b] I13 -(30+26+5) = 52 3 12.8f0.5 [2] 35.3f 1.0 [2] 35.6f0.1 74-(26+5+6) = 3 7 7 12.0f0.6 25.9f0.4 28.2f0.1 [b] 81-(20+5) = 5 6 10

Cleavage of a carbon-sulfur bond in [Nb(SCH2CH2S)3]-leading to formation of a sulfide and tpdt ligand in [NbS(SCH2CH2S)(SCH2CH2SCH2CH2S)]-

“…Structure of the complex anion in 2b, [NbS(SCH2CH2S)-(tpdt)]', showing the 50% probability thermal ellipsoids and the atom labeling scheme. Selected bond distances (A) and angles (deg): Nb-S(l) = 2.455 (3), Nb-S(2) = 2.740 (4), Nb-S(3) = 2.436 (4), Nb-S(4) = 2.467 (4), Nb-S(5) = 2.484 (3), Nb-S(6) = 2.192 (3), S(l)-Nb-S(2) = 78.0 (1), S(2)-Nb-S(3) = 78.5 (1), S(4)-Nb-S(5) = 80.4 (1), S-(2)-Nb-S(6) = 162.8 (1).…”