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43
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85037060689
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Depending on the catalyst, since 0.50 μmol typically weighs less than 1 mg, for accurate measurement it is sometimes necessary to weigh out a larger sample of catalyst and make a standard solution
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Depending on the catalyst, since 0.50 μmol typically weighs less than 1 mg, for accurate measurement it is sometimes necessary to weigh out a larger sample of catalyst and make a standard solution.
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44
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85037078899
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Varian CP-3380 gas chromatograph equipped with fame ionization detector and a Cyclodex B 236M capillary column (50 m × 0.25 μM, DF = 0.25 μM)
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Varian CP-3380 gas chromatograph equipped with fame ionization detector and a Cyclodex B 236M capillary column (50 m × 0.25 μM, DF = 0.25 μM).
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45
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85037130184
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GC factors: GC factors were calculated to correct the fact that different compounds have different FID sensitivities. In the case of styrene, calibrations curves were constructed with respect to the standard 1,2,4-trichlorobenzene (tcb) so exact yields and turnover numbers are available for epoxidation of this olefn. Factor = (μmol compound/μmol tcb) × (peak area tcb/peak area compound). Styrene oxide (sox): Fsox = 3.25 and iodobenzene (PhI): FPhI = 2.91. Calculation of μmol of styrene oxide (sox) or iodosobenzene (PhI) is as follows: μmolA = μmol tcb × (peak area A/peak area tcb) × FA (A = sox or PhI). GC retention time: 24.59 min for the (R) styrene oxide and 25.34 min for the (S) styrene oxide
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GC factors: GC factors were calculated to correct the fact that different compounds have different FID sensitivities. In the case of styrene, calibrations curves were constructed with respect to the standard 1,2,4-trichlorobenzene (tcb) so exact yields and turnover numbers are available for epoxidation of this olefn. Factor = (μmol compound/μmol tcb) × (peak area tcb/peak area compound). Styrene oxide (sox): Fsox = 3.25 and iodobenzene (PhI): FPhI = 2.91. Calculation of μmol of styrene oxide (sox) or iodosobenzene (PhI) is as follows: μmolA = μmol tcb × (peak area A/peak area tcb) × FA (A = sox or PhI). GC retention time: 24.59 min for the (R) styrene oxide and 25.34 min for the (S) styrene oxide.
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a) Rose E, Kossanyi A, Quelquejeu M, Bernard N, Soleilhavoup M, Duwavran F and Lecas A. J. Am. Chem. Soc. 1996; 118: 1567-1568.
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71
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The frst observation is the similar chemical shifts for the αβαβC2 and αβαβC3 porphyrin protons (Table 1). However for the αβαβC1 porphyrin, the chemical shifts of the H4' and H8' deserve comments. Indeed, the H4' protons resonate at a downfeld chemical shift of 8.36 ppm and are deshielded by 1.00 ppm with respect to the corresponding protons in αβαβC2 and αβαβC3. This can be explained by an anisotropy effect of the amido group directly linked to the naphthyl residue whereas in the other cases the naphthyl moiety is linked to a methylene group. For the signal of the H8' proton at 6.00 ppm, the effect of the anisotropy of the macrocycle shields it by a value of 2.11 ppm. The shieldings Δ8 for the two other porphyrins are 1.43 ppm for αβαβC2 and 1.22 ppm for αβαβC3
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The frst observation is the similar chemical shifts for the αβαβC2 and αβαβC3 porphyrin protons (Table 1). However for the αβαβC1 porphyrin, the chemical shifts of the H4' and H8' deserve comments. Indeed, the H4' protons resonate at a downfeld chemical shift of 8.36 ppm and are deshielded by 1.00 ppm with respect to the corresponding protons in αβαβC2 and αβαβC3. This can be explained by an anisotropy effect of the amido group directly linked to the naphthyl residue whereas in the other cases the naphthyl moiety is linked to a methylene group. For the signal of the H8' proton at 6.00 ppm, the effect of the anisotropy of the macrocycle shields it by a value of 2.11 ppm. The shieldings Δ8 for the two other porphyrins are 1.43 ppm for αβαβC2 and 1.22 ppm for αβαβC3.
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Epoxidation of limonene was also tested but the ee again are too low to be exploited: 16% ee of the 1,2-limonene epoxide and 32% for the 8,9-limonene epoxide, the ratio of the two epoxides 1.2/8.9 is 2.8/1
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Epoxidation of limonene was also tested but the ee again are too low to be exploited: 16% ee of the 1,2-limonene epoxide and 32% for the 8,9-limonene epoxide, the ratio of the two epoxides 1.2/8.9 is 2.8/1.
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Shel-Nutt, J.A.8
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