CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
artículos
Título:
Tungstophosphoric acid/zirconia composites prepared by the sol-gel method: An efficient and recyclable green catalyst for the one-pot synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes
Autor/es:
TOA S. RIVERA; ALEXIS SOSA; GUSTAVO P. ROMANELLI; MIRTA N. BLANCO; LUIS R. PIZZIO
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2012
ISSN:
0926-860X
Resumen:
Samples of zirconia modified with different contents of tungstophosphoric acid (TPA) were synthesized
from zirconium propoxide via sol?gel reactions using polyethylene glycol as template and were characterized
by different physicochemical techniques (BET, XRD, FT-IR, and 31P MAS-NMR). The SBET of the
solids decreases and the microporosity increases with the increase of the TPA content. According to FT-IR
and 31P MAS-NMR studies, the main species present in the samples is [PW12O40]3− anion, which was partially
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
solids decreases and the microporosity increases with the increase of the TPA content. According to FT-IR
and 31P MAS-NMR studies, the main species present in the samples is [PW12O40]3− anion, which was partially
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
31P MAS-NMR). The SBET of the
solids decreases and the microporosity increases with the increase of the TPA content. According to FT-IR
and 31P MAS-NMR studies, the main species present in the samples is [PW12O40]3− anion, which was partially
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
31P MAS-NMR studies, the main species present in the samples is [PW12O40]3− anion, which was partially
transformed into [P2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
2W21O71]6− and [PW11O39]7− anions during the synthesis and drying steps. The
XRD patterns of the modified samples exhibit neither the characteristic peaks of TPA nor those attributed
to its decomposition products.
Aryl-14H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.
H-dibenzo[a,j]xanthenes have been synthesized by a one-pot condensation of 2-naphthol and
aryl aldehydes, catalyzed by tungstophosphoric acid/zirconia composites in a solvent-free medium using
conventional heating. The present approach offers the advantages of clean reaction, simple methodology,
short reaction time, and high yield. The reaction work-up is very simple and the catalyst can be
easily separated from the reaction mixture and reused several times in subsequent reactions without
appreciable loss of the catalytic activity.