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+-impregnated silica gel.
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71
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2-alkene adduct is observed (see ref 9).
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note
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In several instances, we have identified the isomerization products, and found them to include the following: (Diagram Presented)
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75
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33749530168
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note
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2 and pentane at -26 °C.
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76
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33749507150
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note
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The pathways differ only in the timing of ring construction, cyclohexyl followed by pinching to the 5-3 in the 6-endo pathway, or beginning with the cyclopentane (5-exo path) and annulating the cyclopropane in step 2.
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77
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33749529243
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The biosynthetic pathway to the thujanes goes via a conceptually related 6-endo pathway; see ref 19b.
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P-P is 20 Hz, cf. ∼200 Hz for a trans coupling), that is, a PPN ligand array.
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3 addition displaces the nitrogen from the metal. Catalysts derived from this ligand do not form cyclopropane products.
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82
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33749533383
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note
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The Josiphos and Walphos ligands in the Solvias ligand kit were also screened and found to not provide any cyclopropane products.
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83
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33749533549
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note
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Yields at higher concentrations were compromised by the formation of tetrasubstituted alkene (see ref 33). This was especially problematic for 2.
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84
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33749519319
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Because the absolute stereochemistry of 2 was assigned by analogy to 20, we caution against any overinterpretation of the absolute assignment.
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We note that each of the substrates in Table 5 gives -ve rotations (MeOH, 546 nm), except for 2 which gives a +ve rotation.
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88
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33749525966
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note
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A change in priority due to N and branching inverts the Cahn-Ingold-Prelog designators.
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89
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33845557915
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