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Formation of methylpropargyl radicals from tetramethylcyclobutadiene radical cations: an esr study
Institution:1. Department of Computer Science and Engineering (AIML), Gokaraju Rangaraju Institute of Engineering and Technology, Hyderabad, Telangana, India;2. Department of Computer Science and Engineering, Neil Gogte Institute of Technology, Hyderabad, Telangana, India;3. Department of Fashion Technology, National Institute of Fashion Technology, New Delhi, India
Abstract:Exposure of dilute solutions of CH3CCCH3 in CC12FCC1F2 and related solvents to ionizing radiation at 77 K produced the radical cation (CH3CCCH3)+. On annealing, these were initiallycpnverted into the corresponding dimer cation, c-C4(CH3)4+, which subsequently decomposed to give the propargyl radical
></figure>. This novel result is supported by studies using CH<sub>3</sub>CCCD<sub>3</sub> which gave, finally, the radicals <figure class=></figure> and <figure class=></figure> in a ratio of approximately 9:1. The absence of the radicals <figure class=></figure> and <figure class=></figure> indicates that the cyclobutadiene ring is strongly distorted (D<sub>2h</sub>) and that the initial dimers do not undergo equilibration via symmetrical dimers under our experimental conditions. These results are compared to liquid-phase data for <em>c</em>-C<sub>4</sub>(CH<sub>3</sub>)<sub>4</sub><sup>+</sup> radicals and explanations for the differences in behaviour are proposed.</td>
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