Acid-Catalyzed Condensation Reaction of Phenylsilanetriol: Unexpected Formation of cis,trans-1,3,5-Trihydroxy-1,3,5-triphenylcyclotrisiloxane as the Main Product and Its Isolation

2014 ◽  
Vol 33 (22) ◽  
pp. 6278-6281 ◽  
Author(s):  
Fujio Yagihashi ◽  
Masayasu Igarashi ◽  
Yumiko Nakajima ◽  
Wataru Ando ◽  
Kazuhiko Sato ◽  
...  
Keyword(s):  
Main Product ◽  
Condensation Reaction ◽  
Unexpected Formation ◽  
Acid Catalyzed

Sulfamic Acid Catalyzed One-Pot Synthesis of Polyhydroquinolines via the Hantzsch Four Component Condensation Reaction

2009 ◽  
Vol 39 (3) ◽  
pp. 161-164 ◽  
Author(s):  
Naser Foroughifar ◽  
Akbar Mobinikhaledi ◽  
Mohammad Ali Bodaghi Fard ◽  
Hassan Moghanian ◽  
Sattar Ebrahimi
Keyword(s):  
Condensation Reaction ◽  
Sulfamic Acid ◽  
One Pot ◽  
One Pot Synthesis ◽  
Acid Catalyzed

Efficient Copper-Catalyzed Synthesis of Substituted Pyrazoles at Room Temperature

Synlett ◽  
2018 ◽  
Vol 29 (20) ◽  
pp. 2689-2692 ◽  
Author(s):  
Haifeng Wang ◽  
Xiangli Sun ◽  
Shuangling Zhang ◽  
Guanglu Liu ◽  
Chunjie Wang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Catalytic System ◽  
Efficient Method ◽  
Room Temperature ◽  
Copper Catalyst ◽  
Condensation Reaction ◽  
Reaction Conditions ◽  
Short Reaction Time ◽  
Acid Catalyzed ◽  
Substituted Pyrazoles

An efficient method for the synthesis of pyrazoles through a copper-catalyzed condensation reaction has been developed. The new catalytic system not only maintained a broad substrate scope but was also active under acid-free reaction conditions, overcoming the conventional requirement for an acid-catalyzed system. Furthermore, the copper catalyst enabled this reaction to be performed at room temperature and in a short reaction time.

scholarly journals A novel antioxidant: 6,6'-(butane-1,1-diyl)bis(4-methylbenzene-1,2-diol)

2018 ◽  
Vol 69 (3) ◽  
pp. 269 ◽  
Author(s):  
T. M. Olajide ◽  
H. Pasdar ◽  
X. C. Weng
Keyword(s):  
Radical Scavenging Activity ◽  
Condensation Reaction ◽  
Radical Scavenging ◽  
Deep Frying ◽  
Scavenging Activity ◽  
Dpph Radical ◽  
Dpph Radical Scavenging Activity ◽  
Relative Ease ◽  
Acid Catalyzed ◽  
Dpph Radical Scavenging

A novel compound, 6,6'-(butane-1,1-diyl)bis(4-methylbenzene-1,2-diol) (BMB), was synthesized through an acid-catalyzed condensation reaction between 4-methylcatechol (HPC) and butyraldehyde. When evaluated by the Rancimat and deep frying methods, BMB exhibited a stronger antioxidant activity than TBHQ. Its DPPH radical scavenging activity was also fairly higher than TBHQ, but lower compared to its mother phenol, HPC, due to its relative ease of binding DPPH•. BMB had the strongest scavenging ability of the 4-methylcatechol analogues reported to date. It could be used effectively to retard lipid peroxidation in both moderate and high temperature food preparations.

Indole-3-methanol is the main product of the oxidation of indole-3-acetic acid catalyzed by two cytosolic basic isoperoxidases from Lupinus

Planta ◽  
1990 ◽  
Vol 181 (3) ◽  
pp. 448-450 ◽  
Author(s):  
A. Ros Barceló ◽  
M. A. Pedreño ◽  
M. A. Ferrer ◽  
F. Sabater ◽  
R. Muñoz
Keyword(s):  
Acetic Acid ◽  
Main Product ◽  
Acid Catalyzed ◽  
Indole 3 Acetic Acid

scholarly journals ACID CATALYSIS OF THE FORMALDEHYDE CONDENSATION REACTION FOR SENSITIVE HISTOCHEMICAL DEMONSTRATION OF TRYPTAMINES AND 3-METHOXYLATED PHENYLETHYLAMINES

1970 ◽  
Vol 18 (11) ◽  
pp. 794-802 ◽  
Author(s):  
ANDERS BJÖRKLUND ◽  
ULF STENEVI
Keyword(s):  
Acid Catalysis ◽  
Condensation Reaction ◽  
Fluorescence Yield ◽  
Histochemical Demonstration ◽  
Formaldehyde Treatment ◽  
Hcl Gas ◽  
Fluorescent Products ◽  
Acid Catalyzed ◽  
Gaseous Formaldehyde ◽  
Related Compounds

Hydrochloric acid catalyzes the formation of fluorophores in the histochemical condensation reaction between gaseous formaldehyde and certain phenylethylamines and indolylethylamines. Thus, when the formaldehyde reaction is carried out in the presence of minute amounts of HCl gas, 3-methoxy-4-hydroxyphenylethylamine, 3,4-dimethoxyphenylalanine and tryptamine displayed a fluorescence yield approximately 20-200 times higher than that obtained after standard formaldehyde treatment in normal air ( i.e., the conditions of the Falck-Hillarp method). This fluorescence intensity was nearly twice as high as that obtained from noradrenaline and dopamine under the standard conditions. The results indicate that the acid catalyzes the first step of the histochemical reaction, i.e., the Pictet-Spengler condensation reaction. In this step low fluorescent tetrahydroisoquinolines and tetrahydro-β-carbolines are formed, which are subsequently dehydrogenated to strongly fluorescent products. Low reactive aromatic amines and amino acids, such as phenylalanine, tyrosine, amphetamine and melatonin, gave no or only very low visible fluorescence after this treatment. Thus, the acid-catalyzed histochemical formaldehyde reaction described in this paper exhibits a good specificity for indolylethylamines and 3-hydroxylated or 3-methoxylated phenylethylamines and will also allow the distinction between these structurally related compounds on the basis of their reactivity in the condensation reaction.

scholarly journals Acid-catalyzed silanol condensation reaction mechanism in a chemical amplification negative resist system.

1990 ◽  
Vol 3 (3) ◽  
pp. 385-388
Author(s):  
Hiroshi Shiraishi ◽  
Emiko Fukuma ◽  
Nobuaki Hayashi ◽  
Takumi Ueno ◽  
Keiko Tadano ◽  
...  
Keyword(s):  
Reaction Mechanism ◽  
Condensation Reaction ◽  
Chemical Amplification ◽  
Acid Catalyzed

Insolubilization mechanism of a chemical amplification negative-resist system utilizing an acid-catalyzed silanol condensation reaction

1991 ◽  
Vol 3 (4) ◽  
pp. 621-625 ◽  
Author(s):  
Hiroshi Shiraishi ◽  
Emiko Fukuma ◽  
Nobuaki Hayashi ◽  
Keiko Tadano ◽  
Takumi Ueno
Keyword(s):  
Condensation Reaction ◽  
Chemical Amplification ◽  
Acid Catalyzed
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