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Part I. Photosensitized Isomerization. Part II. Photosensitized Dimerization


Turro, Nicholas John (1963) Part I. Photosensitized Isomerization. Part II. Photosensitized Dimerization. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/Y47D-AH86.


NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document. cis[...]trans isomerization of the piperylenes (1,3-pentadienes), the 1,2-dichloroethylenes, and the 2-pentenes occurs in the presence of photosensitizers, mainly carbonyl compounds. The results form a coherent pattern if it is assumed that the key step is transfer of triplet excitation, which occurs on every collision between carbonyl triplets and a second molecule provided that transfer is exothermic. Endothermic transfers may occur but only with reduced efficiency. Butadiene, cyclopentadiene, and cyclohexadiene are dimerized by irradiation in the presence of various photosensitizers. The relative yields of butadiene dimers are dependent upon the photosensitizer employed; however, the relative yields of cyclic diene dimers shows no corresponding dependence. The results are consistent with the assumption that energy transfer to the two conformers of butadiene produces two stereoisomeric, non-interconvertible triplets.

Item Type:Thesis (Dissertation (Ph.D.))
Subject Keywords:(Chemistry)
Degree Grantor:California Institute of Technology
Division:Chemistry and Chemical Engineering
Major Option:Chemistry
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hammond, George Simms
Thesis Committee:
  • Unknown, Unknown
Defense Date:1 January 1963
Additional Information:Title varies in the 1963 Caltech commencement program: Energy Transfer in Organic Photochemistry. I. Photosensitized cis-trans Isomerization. II. Photosensitized Dimerization of Conjugated Dienes
Record Number:CaltechETD:etd-07162004-111757
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:2898
Deposited By: Imported from ETD-db
Deposited On:20 Jul 2004
Last Modified:04 Jan 2024 22:18

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PDF (Turro,JR_nj_1963.pdf) - Final Version
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