The Reaction of Singlet Oxygen with α- and β-Pinenes |
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Authors: | Charles W Jefford Andr F Boschung Robert M Moriarty Christian G Rimbault Mostyn H Laffer |
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Institution: | Charles W. Jefford,André F. Boschung,Robert M. Moriarty,Christian G. Rimbault,Mostyn H. Laffer |
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Abstract: | The reaction of photogenerated singlet oxygen with α- and β-pinenes has been carefully re-examined. α-Pinene almost exclusively (99.3% yield) furnishes trans-3-hydroperoxy-pin2(10)-ene. However, detectable amounts of the three other possible products are also found, viz., cis-3-hydroperoxypin-2 (10)-ene (?0.8%), and cis- and trans-2-hydroperoxypin-3 (4)-ene (?0.04%). β-Pinene gives 99.9% of 10-hydroperoxypin-2 (3)-ene and a trace (?0.01%) of norpinan-2-one. Rates of reaction and product composition are treated by modal analysis and reflect the operation of steric and stereoelectronic factors in a reactant-like transition state. |
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