Recent chemistry of benzocyclobutenes
β Scribed by Goverdhan Mehta; Sambasivarao Kotha
- Book ID
- 108371028
- Publisher
- Elsevier Science
- Year
- 2001
- Tongue
- French
- Weight
- 683 KB
- Volume
- 57
- Category
- Article
- ISSN
- 0040-4020
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π SIMILAR VOLUMES
The preferred nature of the "allowed" conrotatory electrocyclic ring openings of cyclobutenes has been extensively documented by both theory and
## Abstract Addition of dichlorocarbene to cyclopentadiene yields chlorobenzene. The addition of dichlorocarbene to cycloheptatriene yields 8,8βdichloroβbicyclo [5.1.0] octadieneβ2,4 (II). When (II) is heated at 140Β° a rearrangement to 1βchlorobenzocyclobutene (III) occurs with evolution of HCl. Re
## Photolysis of bensocyclobutene (1) in pentane solution at 254 nm yields l,l-dihydropentalene (2) and 1,5-dihydropentalene (3) as the major isomeric products; formation of 2 and 3 ys consistent with a --"prebenzvalene" -carbene rearrangement mechanism.