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Abbreviations AIBN CTAB DIBAL-H DME DMSO ee ESR GC-MS HMPA LICA LiTMP m-CPBA MPLC NBSP NMP NOESY PTC TBTH TCNQ TEMPO TFA TLC TMEDA TUDO 2,2'-Azo bisisobutyronitrile Cetyl trimethylammonium bromide Diisobutylaluminium hydride 1,2-Dimethoxyethane Dimethyl sulfoxide Enantiomeric excess Electron spin resonance Gas chromatography-mass spectrum Hexamethylphosphoric acid triamide Lithium isopropylcyclohexylamide Lithium 2,2,6,6-tetramethylpiperidide meta-Chloroperbenzoic acid Medium pressure liquid chromatography para-Nitrobenzenesulphonyl peroxide N-methyl-2-pyrrolidinone Nuclear overhauser enhancement spectroscopy Phase transfer catalyst Tributyltin hydride 7,7,8,8-Tetracy ano-pa ra-quinodimethane 2,2,6,6-Tetramethyl-l-piperidinyloxy free radical Trifluoroacetic acid Thin layer chromatography N,N,N',N'-tetramethyl- 1,2-ethanediamine Thiourea dioxide XXV