Benzylchlorocarbenes generated photolytically from diazirines in EtOH afford chlorostyrenes and acetals, whose distributions are sensitive to the reaction temperature. In the past few years several research groups have studied the chemistry of carbenes in rigid matrix at low temperature. l-4 In the
Kinetics of intramolecular and intermolecular reactions of benzylchlorocarbene
โ Scribed by Michael T.H. Liu; Robert G. Chapman; Roland Bonneau
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 284 KB
- Volume
- 63
- Category
- Article
- ISSN
- 1010-6030
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โฆ Synopsis
Photolysis of 3-chloro-3-benzyldiaiirine in tetramethylethylene gives E-and Z-fi-chlorostyrenes and cyclopropans. Relative rate studies show that the styrenes to cyclopropane ratio increases with increasing diazirine concentration_ This permits the determination of the ratio k,/ki= 8 where kD is the rate constant for the reaction of carbene with diazirine and ki is the rate constant for the 1,Zhydrogen atom shift of carbene. Laser Aash uhotolvsis
๐ SIMILAR VOLUMES
## Abstract PausonโKhand reactions of functionalized allenes with different alkynes give cyclopentenones with generally high regioโ and stereoselectivities. The allenes react through their external double bonds, giving cyclopentenones with exocyclic double bond at their ฮฒ positions and predominantl