Abstract
The matrix isolation technique, combined with infrared spectroscopy and twin jet codeposition, has been used to characterize intermediates and stable “late” products formed during the ozonolysis of (Z)-3-methyl-2-pentene (MP). While twin jet deposition led to minimal product formation, annealing to 35K produced a number of product bands. Based on isotopic labeling and theoretical calculations, product bands have been assigned to the primary ozonide and also tentatively to the secondary ozonide of MP. Indirect evidence for formation of one or both possible Criegee intermediates in this system is presented. While neither possible Criegee intermediate for this system was observed, the evidence overall clearly supports the mechanism first proposed by Criegee for the ozonolysis of alkenes. UV irradiation led to product arising from O atom addition to MP, while merged jet codeposition led to a number of stable products for this system.
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