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25. General procedure for the iodination of alcohols using
KI/P2O5: To a mixture of alcohol (1.0 mmol) and KI (1.5
mmol, 0.25 g) in acetonitrile (5 mL), P2O5 (1.5 mmol, 0.23 g)
was added and the reaction stirred at room temperature for the
time specified in Table 2. After reaction completion (TLC or
GC), the reaction mixture was filtered and the residue washed
with ethyl acetate (3 × 8 mL). The combined organic layers
were washed with an aqueous solution of Na2S2O3 (10%, 10
mL), water (10 mL) and dried over Na2SO4. The solvent was
removed under reduced pressure to afford the corresponding
product. If necessary, further purification was performed by
column chromatography.
26. General procedure for the bromination of alcohols using
KBr/P2O5: To a mixture of alcohol (1 mmol) and KBr (1.5
mmol, 0.18 g) in acetonitrile (5 mL), P2O5 (1.5 mmol, 0.23 g)
was added and the reaction was stirred at room temperature
for the time specified in Table 3. After reaction completion
(TLC or GC), the reaction mixture was filtered and the
residue washed with ethyl acetate (3 × 8 mL). The combined
organic layers were washed with water (10 mL) and dried
over Na2SO4. The solvent was removed under reduced
pressure to afford the corresponding product. If necessary,
further
purification
was
performed
by column
chromatography.
22. (a) Kamal, A.; Ramesh, G.; Laxman, N. Synth. Commun.
2001, 31, 827. (b) Tajbakhsh, M.; Hosseinzadeh, R.; Lasemi,