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The exo diastereoisomer of 5 was independently synthesized from 2 by catalytic reduction with Pd-C in EtOAc, following a procedure reported in ref 11n.
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For the propionic aldehyde photocycloaddition to furan an exo/ endo ratio of 82:1 was determined: Fiege, M. University of Cologne, unpublished results.
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more..
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84
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1542679130
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note
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One reviewer remarked that the endo/exo ratios (described, for example, in eq 3) do not vary in the same order as A values, which are often used to quantify the steric demand of a specific group. This is definitely true, and other contributions also have to be considered, e.g., spin dilution effects by the (conjugated or notconjugated) substituent. For cyclic monoalkenes, we have shown that steric effects are truly decisive (ref 7b-e), and A values are useful parameters to correlate with stereoselectivities. In our opinion, A values are, however, not applicable for description of steric interactions in biradicals such as F′. The cyano group (A value ca. 1.0) is expected to interact much stronger in the pseudoperpendicular conformation F′ than does a methyl group (A value 7.5).
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