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3): E-isomer 6b (more polar product), vinyl-H at δ = 6.36 (dt, J = 9.7, 2.7 Hz); Z-isomer 6c (less polar product), vinyl-H at δ = 5.74 (dt, J = 9.8, 2.1 Hz).
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2 = 0.172. The program SCHAKAL-92 was used for the graphical representation of the crystal structure. Further details of the crystal structure investigation may be obtained from the Fachinformationszentrum Karlsruhe, D-76344 Eggenstein-Leopoldshafen, on quoting the depository number CSD-405841.
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