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Volumn 29, Issue 8, 1990, Pages 927-929

A 1,6‐Diphospha‐1,2,4,5‐hexatetraene, Synthesis and Ring Closure Reactions to Cyclobutenes

Author keywords

[No Author keywords available]

Indexed keywords

EID: 33748517668 PISSN: 05700833 EISSN: 15213773 Source Type: Journal
DOI: 10.1002/anie.199009271 Document Type: Article

Times cited : (47)

References (18)

3
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- Butterworths, London
- (1981) Silicon in Organic Synthesis , pp. 142-152
- Colvin, E.¹

4
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- Aus der Chemie der Carbenoide und anderer thermolabiler Organolithium-Verbindungen
- See. e.g.
- (1972) Angewandte Chemie , vol.84 , pp. 557
- Köbrich, G.¹

6
- 84990085404
- −3. Further details of the crystal structure investigation are available on request from the Fachinformationszentrum Karlsruhe, Gesellschaft für wissenschaftlich‐technische Information mbH, D‐7514 Eggenstein‐Leopoldshafen 2 (FRG), on quoting the depository number CSD‐54659, the names of the authors, and the journal citation.

7
- 84990121130
- max = 210 nm (Ig ε = 4.71), 250 (4.46), 296 (4.64), 305 (4.61), 367 (3.91).

10
- 84990121136
- The phosphaallenes Aryl – P = C = CHR absorb at 220 nm, the molar extinctions ε = 20000–25000 are about half that of 4.

12
- 15444346556
- Chirale Butadiene, 6. Behinderte Rotation an penta- und hexasubstituierten Butadienen – Stützeffekte
- (1975) Chemische Berichte , vol.108 , pp. 3497
- Bödecker, H.‐O.¹ Jonas, V.² Kolb, B.³ Mannschreck, A.⁴ Köbrich, G.⁵

13
- 67650608155
- Partielle Racematspaltung eines atropisomeren Butadiens
- (1974) Angewandte Chemie , vol.86 , pp. 775
- Rösner, M.¹ Köbrich, G.²

15
- 84982071217
- Chiral Butadienes, 91)Preparative Enrichment of Enantiomeric 2,3,4,5-Tetrabromo-2,4-hexadienes by Liquid Chromatography
- (1981) Chemische Berichte , vol.114 , pp. 2365
- Becher, G.¹ Mannschreck, A.²

17
- 84990093256
- max = 230 nm (lg ε = 4.40), 289 (4.51), 306 (4.42), 360(sh, 3.97).

18
- 84990168889
- Thus, the fact that all NMR signals appear only singly in 5, despite the unsymmetrical structure, cannot be explained in terms of a rapid ring‐opening 5 → 4 and renewed conrotatory ring closure. The mechanism required from the (Formula Presented.) NMR data, rapid degenerated rearrangement (a)–with exclusion of a synchronous inversion at the phosphorus atoms–is still unclear.

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