✦ LIBER ✦

Substituent effects on the fluxional rearrangements and isomerization of indenyl silanes and stannanes

✍ Scribed by M.N. Andrews; P.E. Rakita; G.A. Taylor

Publisher: Elsevier Science
Year: 1973
Tongue: French
Weight: 156 KB
Volume: 14
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(01)96256-2

No coin nor oath required. For personal study only.

✦ Synopsis

Recent studies have shown that the monohqto indenyl compounds (I) of a number of main group and transition series metals exhibit dynanic intramolecular (fluxional) rearrangements.' In the case of the indenylsilanes (Ia) a kinetically slower hydrogen migration occurs, giving rise to non-fluxional positional isomers. 2 Fran the relatively low activation energies for the migrations and the demonstrated intramolecularity of the reactions, it has been proposed that the rearrangements proceed through transition states and/or intermediates which involve little if any charge separation during the migration process. 3 The transition state for rearrange-

📜 SIMILAR VOLUMES

The Effects of Substituents on the Degen

The Effects of Substituents on the Degenerate Cope Rearrangement of Semibullvalenes and Barbaralanes

✍ Lloyd M. Jackman; Errol Fernandes; Markus Heubes; Helmut Quast 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 726 KB

The activation parameters [∆G (200 K), ∆H , and ∆S ] for compounds, together with those for related compounds previously reported in the literature, show that conjugating the degenerate Cope rearrangements of barbaralane (1a) and several semibullvalenes (3a, 7a, 8a), and for those of a subsituents (

The effects of methoxyl and phenyl subst

The effects of methoxyl and phenyl substituents on the thermal rearrangements of vinylcyclopropane

✍ John M. Simpson; Herman G. Richey Jr. 📂 Article 📅 1973 🏛 Elsevier Science 🌐 French ⚖ 228 KB

ChemInform Abstract: The Effects of Subs

ChemInform Abstract: The Effects of Substituents on the Degenerate Cope Rearrangement of Semibullvalenes and Barbaralanes.

✍ L. M. JACKMAN; E. FERNANDES; M. HEUBES; H. QUAST 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 32 KB 👁 2 views

Substituent and solvent effects on elect

Substituent and solvent effects on electronic absorption spectra and thermal isomerization of push-pull-substituted cis-azobenzenes

✍ Shunsuke Kobayashi; Hiroshi Yokoyama; Hirotake Kamei 📂 Article 📅 1987 🏛 Elsevier Science 🌐 English ⚖ 496 KB

The electronic absorption spectra of push-pull-substituted cis-azobenzenes were measured using a newly devised spectroscopic method. The solvent effect on the absorption spectra of cis-4-anilino-4'nitroazobenzene is interpreted in terms of a structural change involving the N-N-C angle. The results s

Substituent Effects on Di-π-methane and

Substituent Effects on Di-π-methane and Aza-di-π-methane Rearrangements of Dibenzo[f,h]quinoxalinobarrelenes.

✍ Sheng-Yunn Lin; Hsing-Pang Hsieh; Rama Krishna Peddinti; Chun-Chen Liao 📂 Article 📅 2004 🏛 John Wiley and Sons ⚖ 100 KB 👁 1 views

## Abstract For Abstract see ChemInform Abstract in Full Text.

Influence of the size of upper and lower

Influence of the size of upper and lower rim substituents on the fluxional and complexation behaviour of calix[5]arenes

✍ George Ferguson; Anna Notti; Sebastiano Pappalardo; Melchiorre F. Parisi; Anthon 📂 Article 📅 1998 🏛 Elsevier Science 🌐 French ⚖ 271 KB

A comparative study on a series of penta-O-alkylated p-H-calix[5]arenes lb-e and p-tertbutylcalix[5]arenes lg-m shows that the former are inherently mobile and adopt in solution non-cone conformations. The 1,2-alternate conformation for penta-O-benzyl ether lc was proven by single-crystal X-ray anal