Intramolecular hydrogen abstraction of the vibrationally excited triplet state of simple alkenes

1975 ◽  
pp. 896
Author(s):  
Yoshihisa Inoue ◽  
Setsuo Takamuku ◽  
Hiroshi Sakurai
Keyword(s):  
Triplet State ◽  
Hydrogen Abstraction ◽  
Excited Triplet State ◽  
Vibrationally Excited ◽  
Excited Triplet ◽  
Intramolecular Hydrogen

Study of Chemically Induced Dynamic Nuclear Polarization of Aliphatic Aldehydes in D2O and other Solvents

1975 ◽  
Vol 53 (17) ◽  
pp. 2548-2557 ◽  
Author(s):  
Holger E. Chen ◽  
Michael Cocivera ◽  
Shiv P. Vaish
Keyword(s):  
Triplet State ◽  
Dynamic Nuclear Polarization ◽  
Nuclear Polarization ◽  
Hydrogen Abstraction ◽  
The Other ◽  
Excited Triplet State ◽  
Relative Importance ◽  
Aliphatic Aldehydes ◽  
Excited Triplet ◽  
Chemically Induced

The chemically induced dynamic nuclear polarization arising from irradiation of aliphatic aldehydes in D2O and various other solvents is reported. The aldehydes included acetaldehyde, propionaldehyde, isobutyraldehyde, and pivalaldehyde, and the solvents were benzene, acetonitrile, cyclohexane, methylcyclohexane, perfluoromethylcyclohexane, D2O, and D2O/acetonitrile. For propionaldehyde, the variation of c.i.d.n.p. with solvent can be explained by a variation of the relative importance of α-cleavage vs. hydrogen abstraction which occur via an excited triplet state. In addition, when D2O is the solvent, the c.i.d.n.p. provides information about secondary radical reactions not observed in the other solvents. For the other aldehydes, the nature of the solvent does not seem to affect the relative importance of α-cleavage vs. hydrogen abstraction. Acetaldehyde undergoes hydrogen abstraction whereas isobutyraldehyde and pivalaldehyde undgero α-cleavage via an excited triplet state.

Hydrogen Abstraction of Ketoprofen in the Excited Triplet State with Indole and Methylindoles

2019 ◽  
Vol 123 (44) ◽  
pp. 9388-9394 ◽  
Author(s):  
Wataru Kashihara ◽  
Mana Inoue ◽  
Shunsuke Tanabe ◽  
Shoma Miyata ◽  
Kohei Sakai ◽  
...  
Keyword(s):  
Triplet State ◽  
Hydrogen Abstraction ◽  
Excited Triplet State ◽  
Excited Triplet

Mercury photosensitization of 1-hexene and cis-2-octene vapor. Intramolecular hydrogen abstraction of vibrationally excited π,π* triplet state

1976 ◽  
Vol 54 (20) ◽  
pp. 3117-3124 ◽  
Author(s):  
Yoshihisa Inoue ◽  
Setsuo Takamuku ◽  
Hiroshi Sakurai
Keyword(s):  
Transition State ◽  
Bond Cleavage ◽  
Hydrogen Abstraction ◽  
Minor Importance ◽  
Type Ii ◽  
Subsequent Reaction ◽  
Vibrationally Excited ◽  
Excited Triplet ◽  
Intramolecular Hydrogen ◽  
Membered Transition State

Upon mercury photosensitization, the vibrationally excited triplet of the simple alkenes 1-hexene and cis-2-octene undergoes an olefinic type II reaction consisting of an intramolecular 1,5-hydrogen abstraction via a six-membered transition state and subsequent reaction of the resulting biradical, in sharp contrast to the well established allylic C—C and C—H bond cleavage of alkenes without a γ-hydrogen. The cis–trans photoisomerization of cis-2-octene and other intramolecular hydrogen abstractions of minor importance occurring through unfavorable transition states were also observed. The mercury photosensitization of various cyclic and acyclic alkenes so far reported are comparatively discussed.

Aromaticity Reversal in the Lowest Excited Triplet State of Archetypical Möbius Heteroannulenic Systems

2016 ◽  
Vol 128 (22) ◽  
pp. 6597-6601 ◽  
Author(s):  
Juwon Oh ◽  
Young Mo Sung ◽  
Woojae Kim ◽  
Shigeki Mori ◽  
Atsuhiro Osuka ◽  
...  
Keyword(s):  
Triplet State ◽  
Excited Triplet State ◽  
Excited Triplet

scholarly journals TRANSIENT RAMAN SPECTRA OF ALL-TRANS- AND 9-CIS-RETINAL IN THE EXCITED TRIPLET STATE

1984 ◽  
Vol 13 (4) ◽  
pp. 549-550 ◽  
Author(s):  
Hiro-o Hamaguchi ◽  
Hiromi Okamoto ◽  
Mitsuo Tasumi
Keyword(s):  
Triplet State ◽  
Raman Spectra ◽  
Excited Triplet State ◽  
Excited Triplet
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