The CIDNP observations indicated that photoreaction of methylfurans with chloranil resulted not only furylmethyl hydroxyphenyl ethers via radical pairs but induced furyl radical isomerization to the derivatives of cyc...The CIDNP observations indicated that photoreaction of methylfurans with chloranil resulted not only furylmethyl hydroxyphenyl ethers via radical pairs but induced furyl radical isomerization to the derivatives of cyclopropene,propadiene and pyran.展开更多
CIDNP techniques were applied to study the mechanism of photocycloadditions of 2-chloro-5-methoxybenzoquinone 1 with arylacetylenes 2-5 in benzene-d6 and acetonitrile-d6 respectively.
Photolysis of 4-acetyl-4-ethoxyformylcyclohexanone, 4-acetyl-4-phenylcyclohexanone and 1-acetyl-1-phenylcyclohexane in deuteriochloroform using a high pressure Hg-Xe lamp showed unusual polarizations. The results are ...Photolysis of 4-acetyl-4-ethoxyformylcyclohexanone, 4-acetyl-4-phenylcyclohexanone and 1-acetyl-1-phenylcyclohexane in deuteriochloroform using a high pressure Hg-Xe lamp showed unusual polarizations. The results are explained by the formation of a singlet exciplex of the ketone with deuteriochloroform and the photoaddition of deuteriochloroform to the ketone.展开更多
Chemically Induced Dynamic Nuclear Polarization (CIDNP) technique is applied to study the photochemical reactions of 1-acetylindole-2,3-dione (AID) with several hydrogen do- nors (1—13). These reactions take place by...Chemically Induced Dynamic Nuclear Polarization (CIDNP) technique is applied to study the photochemical reactions of 1-acetylindole-2,3-dione (AID) with several hydrogen do- nors (1—13). These reactions take place by direct hydrogen abstraction of triplet excited AID from the corresponding 1—13 to give neutral radical pair intermediates, which afford polarized starting materials by back hydrogen transfer and give polarized coupling products by radical pair recombination.展开更多
文摘The CIDNP observations indicated that photoreaction of methylfurans with chloranil resulted not only furylmethyl hydroxyphenyl ethers via radical pairs but induced furyl radical isomerization to the derivatives of cyclopropene,propadiene and pyran.
文摘The photochemical[2+2]cycloaddition reaction of carbonyl compunds and alkenes was studied by photochemical induced dynamic nuclear spin polarization.
基金Financial support from the National Natural Science Foundation of China (No: 29975002) is gratefully acknowledged.
文摘CIDNP techniques were applied to study the mechanism of photocycloadditions of 2-chloro-5-methoxybenzoquinone 1 with arylacetylenes 2-5 in benzene-d6 and acetonitrile-d6 respectively.
基金This work was supported by the National Natural Science Foundati on of China.
文摘Photolysis of 4-acetyl-4-ethoxyformylcyclohexanone, 4-acetyl-4-phenylcyclohexanone and 1-acetyl-1-phenylcyclohexane in deuteriochloroform using a high pressure Hg-Xe lamp showed unusual polarizations. The results are explained by the formation of a singlet exciplex of the ketone with deuteriochloroform and the photoaddition of deuteriochloroform to the ketone.
基金the National Natural Science Foundation of China(Grant No.29975002).
文摘Chemically Induced Dynamic Nuclear Polarization (CIDNP) technique is applied to study the photochemical reactions of 1-acetylindole-2,3-dione (AID) with several hydrogen do- nors (1—13). These reactions take place by direct hydrogen abstraction of triplet excited AID from the corresponding 1—13 to give neutral radical pair intermediates, which afford polarized starting materials by back hydrogen transfer and give polarized coupling products by radical pair recombination.
