Aldol Condensation and Esterification over Ti-Substituted *BEA Zeolite: Mechanisms and Effects of Pore Hydrophobicity

ACS Catalysis ◽  
2022 ◽  
pp. 1481-1496
Author(s):  
Zhongyao Zhang ◽  
Claudia E. Berdugo-Díaz ◽  
Daniel T. Bregante ◽  
Hongbo Zhang ◽  
David W. Flaherty
Keyword(s):  
Aldol Condensation ◽  
Bea Zeolite

Characterization of Chemical Impurities in Glutaraldehyde

1975 ◽  
Vol 33 ◽  
pp. 620-621
Author(s):  
B. J. Grenon ◽  
A. J. Tousimis
Keyword(s):  
Glutaric Acid ◽  
Spectroscopic Analysis ◽  
Aldol Condensation ◽  
Condensation Product ◽  
Amorphous Solid ◽  
Water Soluble ◽  
Impurity Component ◽  
Chemical Impurities ◽  
Soluble Liquid

Ever since the introduction of glutaraldehyde as a fixative in electron microscopy of biological specimens, the identification of impurities and consequently their effects on biologic ultrastructure have been under investigation. Several reports postulate that the impurities of glutaraldehyde, used as a fixative, are glutaric acid, glutaraldehyde polymer, acrolein and glutaraldoxime.Analysis of commercially available biological or technical grade glutaraldehyde revealed two major impurity components, none of which has been reported. The first compound is a colorless, water-soluble liquid with a boiling point of 42°C at 16 mm. Utilizing Nuclear Magnetic Resonance (NMR) spectroscopic analysis, this compound has been identified to be — dihydro-2-ethoxy 2H-pyran. This impurity component of the glutaraldehyde biological or technical grades has an UV absorption peak at 235nm. The second compound is a white amorphous solid which is insoluble in water and has a melting point of 80-82°C. Initial chemical analysis indicates that this compound is an aldol condensation product(s) of glutaraldehyde.

Synthesis of Mintlactone via Cross-Aldol Condensation Between 3-Methylcyclohexanone and Ethyl Pyruvate Using Ferric Chloride Hexahydrate as Catalyst

2013 ◽  
Vol 30 (9) ◽  
pp. 1005
Author(s):  
Xiong CHEN ◽  
Jinyun LIU ◽  
Yabai LI ◽  
Jianfu LIU ◽  
Huawu YANG
Keyword(s):  
Ferric Chloride ◽  
Aldol Condensation ◽  
Ethyl Pyruvate ◽  
Chloride Hexahydrate ◽  
Ferric Chloride Hexahydrate

Unexpected isolation of a cyclohexenone derivative

2019 ◽  
Vol 74 (11-12) ◽  
pp. 819-824
Author(s):  
Jürgen Voss ◽  
Rüdiger Röske ◽  
Gunnar Ehrlich ◽  
Gunadi Adiwidjaja
Keyword(s):  
Structure Determination ◽  
Aldol Condensation ◽  
Knoevenagel Reaction ◽  
X Ray

AbstractKnoevenagel reaction of pivaloylacetone with formaldehyde and subsequent aldol condensation ends up with 3-methyl-4,6-dipivaloylcyclohex-2-enone. The structure of the product is proved by an X-ray structure determination.

Ultrafast surfactant-templating of *BEA zeolite: An efficient catalyst for the cracking of polyethylene pyrolysis vapours

2021 ◽  
Vol 412 ◽  
pp. 128566
Author(s):  
Umer Khalil ◽  
Zhendong Liu ◽  
Ce Peng ◽  
Naomichi Hikichi ◽  
Toru Wakihara ◽  
...  
Keyword(s):  
Efficient Catalyst ◽  
Bea Zeolite ◽  
Surfactant Templating

A copper-impregnated BEA zeolite for adsorption and oxidation of aromatic species during vehicle cold starts

2021 ◽  
Vol 287 ◽  
pp. 119951
Author(s):  
Eunhee Jang ◽  
Layoung Choi ◽  
Jinseong Kim ◽  
Yanghwan Jeong ◽  
Hionsuck Baik ◽  
...  
Keyword(s):  
Bea Zeolite ◽  
Aromatic Species ◽  
Cold Starts

scholarly journals Nonanal Sensor Fabrication Using Aldol Condensation Reaction Inside Alkali-Resistant Porous Glass

2021 ◽  
pp. 1-1
Author(s):  
Masato Tsujiguchi ◽  
Takashi Aitoku ◽  
Hironori Takase ◽  
Yasuko Yamada Maru
Keyword(s):  
Porous Glass ◽  
Aldol Condensation ◽  
Condensation Reaction ◽  
Sensor Fabrication

An efficient click synthesis of chalcones derivatized with two 1-(2-quinolon-4-yl)-1,2,3-triazoles

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohammed B. Alshammari ◽  
Ashraf A. Aly ◽  
Alan B. Brown ◽  
Md Afroz Bakht ◽  
Ahmed M. Shawky ◽  
...  
Keyword(s):  
Aldol Condensation ◽  
Aldol Reaction ◽  
Click Synthesis

Abstract Chalcones derivatized with 1-(2-quinolonyl)-1,2,3-triazoles were synthesized by reaction of 4-azido-2-quinolones with 1-phenyl-3-(4-propargyloxyphenyl)prop-2-en-1-one, or by aldol reaction of 4-{[1-(2-oxo-1,2-dihydroquinolin-4-yl)-1H-1,2,3-triazol-4-yl]methoxy}benzaldehydes with acetophenone. Whereas, chalcones bearing two 1-(2-quinolonyl)-1,2,3-triazoles were synthesized by reaction of 1,3-bis(4-propargyloxyphenyl)prop-2-en-1-one with 4-azido-2-quinolones, or by aldol condensation between 4-{4-[(4-acetylphenoxy)methyl]-1H-1,2,3-triazol-1-yl}quinolin-2(1H)-ones and 4-{[1-(2-oxo-1,2-dihydroquinolin-4-yl)-1H-1,2,3-triazol-4-yl]methoxy}benzaldehydes.

Transition metal-free approach to azafluoranthene scaffolds by aldol condensation/[1+2+3] annulation tandem reaction of isocyanoacetates with 8-(alkynyl)-1-naphthaldehydes

2021 ◽  
Author(s):  
Penghui Dong ◽  
Kashif Majeed ◽  
lingna Wang ◽  
Zijian Guo ◽  
Fengtao Zhou ◽  
...  
Keyword(s):  
Transition Metal ◽  
Aldol Condensation ◽  
Domino Reaction ◽  
Tandem Reaction ◽  
Metal Free ◽  
Successive Formation ◽  
General Synthesis

A transition metal-free aldol condensation/[1+2+3] annulation reaction of isocyanoacetates with 8-(alkynyl)-1-naphthaldehydes has been developed for the general synthesis of azafluoranthenes. This domino reaction enables successive formation of three new bonds...

Development of New Iron Catalysts for the Tandem Isomerization—Aldol Condensation of Allylic Alcohols.

ChemInform ◽  
2003 ◽  
Vol 34 (49) ◽  
Author(s):  
Ramalinga Uma ◽  
Nicolas Gouault ◽  
Christophe Crevisy ◽  
Rene Gree
Keyword(s):  
Aldol Condensation ◽  
Iron Catalysts ◽  
Allylic Alcohols
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