Magnetic isotopic effect and mechanisms of chemical reactions. Photolysis of dimethylphenylsilyl phenyl ketone and of its carbon analog in micelles

Journal Article · Wed Apr 09 23:00:00 EST 1986 · J. Gen. Chem. USSR (Engl. Transl.); (United States)

OSTI ID:5885932

Step, E N; Tarasov, V F; Buchachenko, A L

In the photolysis of cumyl phenyl ketone in micelles, for which photodecomposition occurs with the formation of a triplet geminal radical pair (Norrish type-I breakdown), with high efficiency the separation of carbon isotopes, induced by the magnetic isotopic effect, occurs for the original ketone. The isotopic composition of dimethylphenylsilyl phenyl ketone, either with respect to carbon or with respect to silicon, does not change in photolysis, i.e., in the primary act of the photolysis the separation of isotopes does not occur. It follows that the primary act of the photolysis of the ketone is not the formation of a radical pair, but is probably isomerization into a carbene.

• Research Organization: Institute of Chemical Physics, Moscow, USSR
• OSTI ID: 5885932
• Journal Information: J. Gen. Chem. USSR (Engl. Transl.); (United States), Journal Name: J. Gen. Chem. USSR (Engl. Transl.); (United States) Vol. 55:10; ISSN JGCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
400500 -- Photochemistry
640302 -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ANGULAR MOMENTUM
CARBON 12
CARBON 13
CARBON ISOTOPES
CATALYTIC EFFECTS
CHEMICAL REACTIONS
COMPLEXES
DECOMPOSITION
DIPOLE MOMENTS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HALOGENATED ALIPHATIC HYDROCARBONS
HYPERFINE STRUCTURE
IODINATED ALIPHATIC HYDROCARBONS
ISOMERIZATION
ISOTOPE EFFECTS
ISOTOPE RATIO
ISOTOPE SEPARATION
ISOTOPES
ISOTOPIC EXCHANGE
KETONES
LIGHT NUCLEI
MAGNETIC DIPOLE MOMENTS
MAGNETIC MOMENTS
METHYL IODIDE
NUCLEI
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC IODINE COMPOUNDS
OXIDATION
PARTICLE PROPERTIES
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RECOMBINATION
REDUCTION
SEPARATION PROCESSES
SILICON 29
SILICON COMPLEXES
SILICON ISOTOPES
SPECTRAL SHIFT
SPIN
STABLE ISOTOPES