[2+2] Cycloadditions of Fluorinated Methylenecyclopropanes And the Thermolysis of 3,4 Dimethyl 1,1,2,2-Tetrafluorocyclobutane
[2+2] Cycloadditions of Fluorinated Methylenecyclopropanes And the Thermolysis of 3,4 Dimethyl 1,1,2,2-Tetrafluorocyclobutane
Daly, Daniel
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From these arguments, information about the structure of the activated complex leading to the below structure can be obtained.
rfr ".\ D> — <-.
f b J/ a % b The spatial arrangement of the olefins must be very similar to that expected in a non synchronous concerted pathway, where the distance between the potential bonding sites closely approximates the bond lengths in the cyclobutane product. This rationale also accounts for the steric retar- dation of [2+2] cycloaddition reactions and the absence of rearranged cyclopropylcarbinyl radicals. Note another possibility for the structure of the diradical inter- mediate is the transoid conformer shown below.
58 H >* < ir Rotation of this intermediate could be inhibited by the cyclopropyl protons and thus the inability of dif luoromethylenecyclopropane to dimerize would be due to this inhibition of rotation. However, if this is the preferred conformation of the diradical intermediate it is hard to rationalize the extremely different conditions for dimerization of the dichlorornethylenecyclopropane and methylenecyclopropane .
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