1.1
Reagents:
Tetrabutylammonium perchlorate
Solvents:
Acetonitrile
2.1
Reagents:
Tributylphosphine
Solvents:
Tetrahydrofuran
;
30 min, rt
2.2
3 h, rt
2.3
Reagents:
Acetic acid
Solvents:
Water
;
15 min, rt