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more..
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geometries of CPD-IVb, CPD-IIIb, CPD-VIIb, and CPD-VIIIb were made by changing all the signs of the Cartesian coordinates of the geometries of CPD-IVa, CPD-IIIa, CPD-VIIa, and CPD-VIIIa. The energies of CPD-IVb, CPD-IIIb, CPD-VIIb, and CPD-VIIIb are the same as those of CPD-IVa, CPD-IIIa, CPD-VIIa, and CPD-VIIIa
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The geometries of CPD-IVb, CPD-IIIb, CPD-VIIb, and CPD-VIIIb were made by changing all the signs of the Cartesian coordinates of the geometries of CPD-IVa, CPD-IIIa, CPD-VIIa, and CPD-VIIIa. The energies of CPD-IVb, CPD-IIIb, CPD-VIIb, and CPD-VIIIb are the same as those of CPD-IVa, CPD-IIIa, CPD-VIIa, and CPD-VIIIa.
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39
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CHT has a geometric isomer, bicyclo4.1.0hepta-2, 4-diene norcaradiene, NCD. NCD has a puckered conformation, which is apparently suitable for the intramolecular hydrogen shift. However, NCD cannot be a reactant for the hydrogen shift, because the cyclopropyl ring in NCD precludes the hydrogen-bridged TS structure. Cycloadditions between CHT and NCD were calculated and are less stable than the ratedetermining step VIIa, b in Figure 8. A series of isomerizations of methyl-NCDs were observed. They would involve intermediates of cycloadducts of two methyl-CHTs
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CHT has a geometric isomer, bicyclo[4.1.0]hepta-2, 4-diene (norcaradiene, NCD). NCD has a puckered conformation, which is apparently suitable for the intramolecular hydrogen shift. However, NCD cannot be a reactant for the hydrogen shift, because the cyclopropyl ring in NCD precludes the hydrogen-bridged TS structure. Cycloadditions between CHT and NCD were calculated and are less stable than the ratedetermining step VIIa, b in Figure 8. A series of isomerizations of methyl-NCDs were observed. They would involve intermediates of cycloadducts of two methyl-CHTs.
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