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- W2022298083 endingPage "69" @default.
- W2022298083 startingPage "58" @default.
- W2022298083 abstract "Abstract The reduction of RBHal 2 (Hal=F, Cl, Br) with Na/K alloy gives the tetraboranes B 4 R 4 , B 4 H 2 R 4 or their mixtures, depending on temperature, reaction time and solvent. We describe here B 4 t Bu 4 , B 4 (CH 2 t Bu) 4 , B 4 H 2 t Bu 4 , B 4 H 2 (CH 2 t Bu) 4 and B 4 H 2 (CMe 2 Et) 4 . B 4 t Bu 2 (CH 2 t Bu) 2 is formed by reducing the diborane Cl–B( t Bu)–B(CH 2 t Bu)–Cl with Li. The conversion of B 4 H 2 t Bu 4 into B 4 H 4 t Bu 4 proceeds in three steps: (i) reduction (→[B 4 H 2 t Bu 4 ] 2− ); (ii) first protonation (→[B 4 H 3 t Bu 4 ] − ), and (iii) second protonation (→B 4 H 4 t Bu 4 ). The hypercloso -species B 4 R 4 have tetrahedral structures. The two opposite edges of a B 4 tetrahedron of the closo -B 4 H 2 R 4 are bridged by H atoms ( D 2 d ). The nido -species have a bicyclobutane-type B 4 skeleton; three of the four outside edges are bridged by H atoms; two terminal ligands are bound to one of the B atoms: H in exo - and t Bu in endo -position ( C 1 ). Structural evidence is based on low-temperature NMR spectra, ab initio geometries, and IGLO(DZ) calculations of the 11 B NMR shifts. Dynamical behavior of bridging H atoms is indicated by the NMR spectra at higher temperature." @default.
- W2022298083 created "2016-06-24" @default.
- W2022298083 creator A5011835456 @default.
- W2022298083 creator A5023112608 @default.
- W2022298083 creator A5033031295 @default.
- W2022298083 creator A5042832842 @default.
- W2022298083 creator A5069655958 @default.
- W2022298083 creator A5090462293 @default.
- W2022298083 date "1999-06-01" @default.
- W2022298083 modified "2023-10-16" @default.
- W2022298083 title "Novel tetraalkyltetraboranes of the type B4R4, B4H2R4 and B4H4R4" @default.
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