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Atomic coordinates for structures 4b and 6b have been deposited with the Cambridge Crystallographic Data Centre. The coordinates can be obtained on request from Cambridge Crystallographic Data Centre, 12 Union Road, Cambridge, CB21EZ, U K.
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37
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85037956593
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note
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Due to the formation of many by-products during the reaction this compound was isolated in very slightly impure form after column chromatography on silicagel. Nevertheless, pure form can be obtained after crystallization or trituration in diethyl ether. This was accomplished from the very small quantity isolated so yield obtained after this further purification is not representative and therefore is not given.
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