The N-protected 1,10-diaza[2.2]metacyclo-and 1,10-diaza-the hypothesis that 7 is one of the most strained antihetera[2.2]metacyclophanes known. This is also evident from [2]metacyclo[2](2,6)-pyridinophanes 4 and 5 have been synthesized for the first time using high dilution conditions. the 1 H-NMR s
The synthesis and fluxional behavior of the first [2.1.2.1] metacyclophane
✍ Scribed by Reginald H. Mitchell; Yee Hing Lai
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- French
- Weight
- 205 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0040-4039
No coin nor oath required. For personal study only.
✦ Synopsis
is synthesised. Variable temperature 1Hmr and 13Cmr spectra indicate that4e is the most likely conformation and that at temperatures above 50°C the molecule is fluxional (AGATE = 15.4 kcal/mole).
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The condensation of dibromo-p-tolylstibane with 2,2%-dilithio-1,1%-binaphthyl 3, generated in situ from optically active 2,2%-dibromo-1,1%-binaphthyl (R)-(+)-2 by treatment with tert-butyllithium, afforded optically active (R)-( -)-7-p-tolyldinaphtho[2,1-b;1%,2%-d]stibole 1c, which is fluxional in t
The First 1,10-Diaza[2.2]metacyclophanes -Strained Medium Membered Heterocycles. -The title compounds are prepared using high dilution techniques. Compound (Ic) is one of the most strained antihetera[2.2]metacyclophanes known, as evidenced by NMR spectroscopy and quantum chemical calculations.