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Titolo:
STRUCTURES OF STERICALLY OVERCROWDED OR CHARGE-PERTURBED MOLECULES .28. [(H3C)(3)SI]C-3-C-C-C[SI(CH3)(3)](3) - A PI-SYSTEM CONCEALED BY A HYDROCARBON VEIL
Autore:
BOCK H; MEURET J; RUPPERT K;
Indirizzi:
UNIV FRANKFURT,INST INORGAN CHEM,NIEDERURSELER HANG W-6000 FRANKFURT 50 GERMANY
Titolo Testata:
Journal of organometallic chemistry
fascicolo: 1-2, volume: 462, anno: 1993,
pagine: 31 - 37
SICI:
0022-328X(1993)462:1-2<31:SOSOOC>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
RAY CRYSTAL-STRUCTURE; GAS-PHASE REACTIONS; LONG SI-SI; TRIS(TRIMETHYLSILYL)SILYL DERIVATIVES; SILICON-COMPOUNDS; RADICAL IONS; CHEMISTRY; OXIDATION; MODELS; BONDS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
67
Recensione:
Indirizzi per estratti:
Citazione:
H. Bock et al., "STRUCTURES OF STERICALLY OVERCROWDED OR CHARGE-PERTURBED MOLECULES .28. [(H3C)(3)SI]C-3-C-C-C[SI(CH3)(3)](3) - A PI-SYSTEM CONCEALED BY A HYDROCARBON VEIL", Journal of organometallic chemistry, 462(1-2), 1993, pp. 31-37

Abstract

The kinetically shielded di(tris(trimethylsilyl)methyl)acetylene crystallizes in the triclinic space group P (1) over bar with 1 molecule per unit cell in rather dense lattice packing. Its staggered skeletal conformation of close to D-3d symmetry represents a sterically advantageous cogwheel gearing of the inner methyl groups of the half-shells ofboth substituents. The shortest nonbonded C...C distances of 400 pm between them equal the sum of the van der Waals radii of two H3C groups. A space-filling representation of the molecular structure shows the acetylenic pi-system to be almost completely covered by the peripheralHC skin, in keeping with its unusual unreactivity, e.g. towards catalytic hydrogenation. The spatial and electronic effects of the bulky substituents are discussed in terms of structural comparisons with chemically related compounds such as [(H3C)(3)Si]Si-3-Si[Si(CH3)(3)](3), [(H3C)(3)C]Si-3-Si[C(CH3)(3)](3) or [(H3C)(3)Si]C-3-C6H4-C[Si(CH3)(3)](3), which also adopt staggered conformations of their sterically congested [(H3C)(3)X]Y-3-half shells along substituent axes of C-3-symmetry at different distances Y...Y.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 14:33:00