Absence of intersystem crossing in 1,4-didehydrobenzene | Zendy

William B. Lott | Zendy; Tom Evans | Zendy; Charles B. Grissom | Zendy

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Absence of intersystem crossing in 1,4-didehydrobenzene

Author(s) -

William B. Lott,

Tom Evans,

Charles B. Grissom

Publication year - 1994

Publication title -

journal of the chemical society. perkin transactions ii

Language(s) - English

Resource type - Journals

eISSN - 2050-8239

pISSN - 0300-9580

DOI - 10.1039/p29940002583

Subject(s) - intersystem crossing , enediyne , chemistry , thermal decomposition , singlet state , singlet fission , photochemistry , diradical , flux (metallurgy) , decomposition , triplet state , stereochemistry , atomic physics , physics , excited state , organic chemistry , molecule

The rate of singlet-to-triplet intersystem crossing in 1,4-didehydrobenzene (the biradical produced as a reactive intermediate in the thermal cycloaromatization of enediynes), cannot be increased by the application of an external magnetic field. The rate of product formation and the distribution of stable products of 2,3-di-n-propyl-1,4-didehydrobenzene thermolysis is unchanged at magnetic flux densities in the range 0–2000 G and at 66 000 G. Similarly, the rate of thermolysis of an unsymmetrical enediyne is insensitive to magnetic field flux in the same range. This finding precludes the modulation of enediyne reaction rates in pharmaceutical and synthetic pursuits

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