Three chiral stable free radicals containing a hydroxymethyl group have been resolved by biocatalysis. By recrystallization and/or re-esterification each molecule was produced in very high enantiomeric purity. The resolved 1-oxyl-3-hydroxymethyl-2,2,5,5-tetramethylpyrrolidine alcohols were converted to methanethiosulfonate spin labels, 1-oxyl-3-methanesulfonylthiomethyl-2,2,5,5-tetramethylpyrrolidines. Enantiomeric purities have been determined by the F-19 NMR method of the respective Mosher esters. Absolute configurations were assigned by comparing the chemical shifts of the Mosher esters and also by comparing the specific rotations obtained with the same enzyme preparations. (C) 2004 Elsevier Ltd. All rights reserved.
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KTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, SwedenKTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, Sweden
Zhang, Yang
Zhang, Yang
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KTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, SwedenKTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, Sweden
Zhang, Yang
Xie, Sheng
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KTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, SwedenKTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, Sweden
Xie, Sheng
Yan, Mingdi
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KTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, Sweden
Univ Massachusetts, Dept Chem, 1 Univ Ave, Lowell, MA 01854 USAKTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, Sweden
Yan, Mingdi
Ramstrom, Olof
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KTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, SwedenKTH Royal Inst Technol, Dept Chem, Teknikringen 30, S-10044 Stockholm, Sweden
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Indian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, India
Kamal, A
Khanna, GBR
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Indian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, India
Khanna, GBR
Ramu, R
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Indian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, India
Ramu, R
Krishnaji, T
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Indian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, IndiaIndian Inst Chem Technol, Div Organ Chem, Biotransformat Lab, Hyderabad 500007, Andhra Pradesh, India