(2,2,6,6-tetramethylpiperidinyl)MgCl*LiCl; (2,2,6,6-tetramethylpiperidine)2Zn·2MgCl2·2LiCl; oxygen; manganese (II) chloride in tetrahydrofuran T=20°C; P=760.051 Torr; 1 h;

sodium ethanolate in ethanol

1: N2H4 / ethanol 2: NaOEt / ethanol View Scheme

(i) nBuLi, THF, (ii) /BRN= 1900390/, (iii) aq. HCl; Multistep reaction;