Citation
Bush, Warren Van Ness (1958) A Study of the Boron Trifluoride Complexes of Some Carotenoid Hydrocarbons and the Products of their Hydrolytic and Alcoholytic Cleavage. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/N1HM-3215. https://resolver.caltech.edu/CaltechETD:etd-10072004-100851
Abstract
Formation of a deeply-colored [alpha]-carotene - boron trifluoride complex, by means of boron trifluoride etherate, and subsequent hydrolysis of the complex result mainly in the formation of 4-hydroxy-[alpha]-carotene, indicating that, under the conditions applied, only the [beta]-ionone end of the complex is reactive; ethanolysis gave the corresponding ethoxy derivative. The structures of these two compounds and some of the other reaction products were clarified. On this basis the structure of the BF3-complex has also been established, and a mechanism for its hydrolysis and alcoholysis was postulated. The length of the resonating system within the proposed complex is consistent with the observed deep blue color. Lycopene and [gamma]-carotene were studied along similar lines. The observed formation of 5,6-dihydroxy-5,6-dihydrolycopene by hydrolysis of the lycopene complex can be explained by means of a structure and a hydrolysis mechanism both similar to those of the [alpha]-carotene complex. The formation of 4-hydroxy-[gamma]-carotene by hydrolysis of the [gamma]-carotene complex is in accordance with an analogous structure and hydrolysis mechanism. The [beta]-ionone end of the [gamma]-carotene complex appears to be more reactive than the [psi]-ionone end. The cis-trans isomerization of 4-hydroxy-, 4-keto-, and 4-ethoxy-[alpha]-carotene as well as 5,6-dihydroxy-5,6-dihydrolycopene was studied.
Item Type: | Thesis (Dissertation (Ph.D.)) |
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Subject Keywords: | (Chemistry and Chemical Engineering) |
Degree Grantor: | California Institute of Technology |
Division: | Chemistry and Chemical Engineering |
Major Option: | Chemistry |
Minor Option: | Chemical Engineering |
Thesis Availability: | Public (worldwide access) |
Research Advisor(s): |
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Thesis Committee: |
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Defense Date: | 1 January 1958 |
Record Number: | CaltechETD:etd-10072004-100851 |
Persistent URL: | https://resolver.caltech.edu/CaltechETD:etd-10072004-100851 |
DOI: | 10.7907/N1HM-3215 |
Default Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. |
ID Code: | 3964 |
Collection: | CaltechTHESIS |
Deposited By: | Imported from ETD-db |
Deposited On: | 07 Oct 2004 |
Last Modified: | 13 Oct 2023 23:46 |
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