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Journal of Chemistry
/
2013
/
Article
/
Tab 2
/
Research Article
High-Speed Reduction of Triarylpyrylium Salts Using Zn(BH
4
)
2
/SiO
2
as an Efficient and Regiospecific Reducing Reagent
Table 2
Reaction of pyrylium salts with Zn(BH
4
)
2
/SiO
2
.
Entry
Substrate
Product
Yield (%)
Time ( min)
1
98
5
2
85
3
3
92
3
4
97
Imm.
5
79
Imm.
6
92
Imm.
7
89
Imm.
8
90
Imm.
9
82
Imm.
Imm: immediately (1 min).