2,2′-Diphenyl-Δ3,3′-bi-3H-indole-1,1′-dioxide: Competitive demethylation and redox reactions
✍ Scribed by Paolo Bruni; Carla Conti; Giorgio Tosi
- Publisher
- Springer Vienna
- Year
- 1988
- Tongue
- English
- Weight
- 253 KB
- Volume
- 119
- Category
- Article
- ISSN
- 0026-9247
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To whom correspondence should be addressed. \*\* In the all purified samples of compound (I) the reported s presence of a small amount (ca. 0.5~) of 1-oxy-l'-hydroxy-2,2'-diphenyl-3,3'-bi-indole radical should not introduce any complication in our experiments.
In the title compound, C 29 H 23 NO 2 S, the bond angles around the S atom indicate a distorted tetrahedral configuration. The crystal structure is stabilized by weak C-HÁ Á ÁO and C-HÁ Á Á hydrogen bonds.
## Abstract An auto oxidation‐rearrangement product 4 was isolated from a high dilution reaction of ninhydrin with 3,4,5‐trimethoxyaniline in water. A general synthesis of this compound and its derivatives 4–6 was devised by oxidation of tetrahydroindeno[1,2‐__b__]indol‐10‐ones 1–3 with sodium peri