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1H NMR spectrum of the alkylzirconium species 2a and 2b, only resonances for the major isomer were readily discernible. The configuration of the major isomer could not be assigned.
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38
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85039581579
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note
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The reaction of the mixture of 2a and 2b with TMSOTf as the Lewis acid gave a 29% yield of a 5:1 mixture of labeled phenylcyclopropanes 3a:3b.
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39
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85039570984
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note
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13
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41
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85039570739
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note
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Because of deuterium coupling, it was not possible to use line shape simulations to estimate the amount of 4.
-
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42
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85039575058
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note
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The regiochemistry of insertion of styrene is shown as having the Ph α to Ti. If the titanacycle had formed with the alternative regiochemistry with Ph β to titanium, the observed stereochemistry of the cyclopropane would also have required retention of configuration at the carbon bonded to titanium.
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