Time resolved spectroscopy of carbenepyridene ylides: Distinguishing carbenes from diazirine excited states |
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Authors: | M S Platz W R White D A Modarelli S Celebi |
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Institution: | 1. Department of Chemistry, The Ohio State University, 120 W. 18th Avenue, 43210, Columhus, OH, USA 2. Müh-Mim. Dakültesi, Cevre Müh. B?lümü, Dokuz Eylül Universitesi, Bornova, Izmer, Turkey
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Abstract: | The photochemistry of diazirines and diazo compounds is not as simple as nitrogen extrusion and carbene formation. The C-H
bonds adjacent to the diazo and diazirine moieties can migrate in the excited state and produce stable products without the
benefit of a relaxed carbene intermediate. Additionally, cyclobutyl substituted systems exhibit carbon migration. It is unfortunate
that the products of photochemical rearrangement of precursor excited states are identical to the products of thermal rearrangement
of carbenes. This has prevented accurate measurement of the yield and absolute reactivity of alkylcarbenes. That pyridine
reacts selectively with carbenes and not with the excited states of their nitrogenous precursors has allowed the separation
of these two pathways and an appreciation of their relative importance with structural variation. |
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