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26844579417
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note
-
In the reviewing process, a referee suggested use of a Co(III)-salen complex bearing electron-donating groups at C4(4′) and C5(5′) carbons. According to the suggestion, we examined the reaction of styrene and tert-butyl diazoacetate in the presence of complex i at room temperature and found that the reaction gave a 96:4 mixture of tert-butyl trans- and cis-2-phenylcyclopropane-1-carboxylate in 84%. The enantiomeric excess of the trans-isomer was 89%, which was inferior to that observed with complex (6-Br). (Chemical Equation Presented)
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-
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41
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0030600176
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a) Noguchi, Y.; Irie, R.; Fukuda, T.; Katsuki, T. Tetrahedron Lett. 1996, 37, 4533-4536.
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Noguchi, Y.1
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-
43
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0001087427
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Electronic effect of the substituent of the salen ligand on enantioselectivity in Mn-salen catalyzed epoxidation has been discussed: Jacobsen, E. N.; Zhang, W.; Güler, M. L. J. Am. Chem. Soc. 1991, 113 6703-6704.
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Jacobsen, E.N.1
Zhang, W.2
Güler, M.L.3
-
44
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26844495384
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note
-
The aldehyde was purchased from nacalai tesque and used after distillation.
-
-
-
-
45
-
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26844475164
-
-
note
-
2O by heating at 70°C under vacuum for 2 h.
-
-
-
-
46
-
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37049091832
-
-
The aldehyde was prepared from corresponding substituted phenols according to the literature procedure: Casiraghi, G.; Casnati, G.; Puglia, G.; Sartori, G.; Terenghi, G. J. Chem. Soc., Perkin Trans. 1 1980, 1862-1865.
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-
Casiraghi, G.1
Casnati, G.2
Puglia, G.3
Sartori, G.4
Terenghi, G.5
-
47
-
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26844506810
-
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note
-
1H NMR spectroscopic data with those of tert-butyl trans- and cis-2-phenylcyclopropane-1-carboxylates (reference 3b).
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