Esterification of 2,6-Pyridinedicarboxylic Acid with n-Butanol Catalyzed by Heteropoly Acid H3PW12O40 or Its Ce(III) Salt
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Journal of Molecular Catalysis A: Chemical
ISSN: 1381-1169
|
| Output data |
Year: 1995,
Volume: 102,
Number: 2,
Pages: 73-77
Pages count
: 5
DOI:
10.1016/1381-1169(95)90042-X
|
| Tags |
Cerium, Esterification, Heteropoly acid, Pyridinedicarboxylic acid, Tungsten |
| Authors |
Timofeeva M.N.
1
,
Maksimovskaya R.I.
1
,
Paukshtis E.A.
1
,
Kozhevnikov I.V.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis
|
|
The liquid-phase esterification of 2,6-pyridinedicarboxylic acid (PA) with n-BuOH is efficiently catalyzed by heteropoly acid H3PW12O40 as a homogeneous catalyst and by its insoluble acidic Ce(III) salt, Ce0.87H0.4PW12O40, as a heterogeneous catalyst, yielding 100% of PA dibutyl ester. The Ce(III) salt has a lower activity than H3PW12O40 but can be easily recovered and reused. Insoluble NH+4, K+ and Cs+ salts also exhibit moderate activities. The activity of the salts decreases in the series: Ce0.87H0.4PW12O40 ⪢ Cs2.5H0.5PW12O40 ∼ Cs3PW12O40 ∼ Cs2HPW12O40 ∼ (NH4)3PW12O40 > K3PW12O40.