Reactivity and mechanisms of hydridic hydrogen of B-H in ammonia borane towards acetic acids: the ammonia B-monoacyloxy boranes

2021 ◽  
Author(s):  
Huizhen Li ◽  
Yunhui Li ◽  
Jiaxin Kang ◽  
Lin Fan ◽  
Qiuyu Yang ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Ammonia Borane ◽  
Acid Base ◽  
Chloro Derivatives ◽  
Acetic Acids

The non-classical acid-base neutralization reactions of ammonia borane (NH3•BH3, AB) with acetic acids are moderate, affected by the strengths of acetic acid and its chloro derivatives, the concentrations and ratios...

Fluorinated tricyclic neuroleptics with prolonged action: 8-Methoxy, 8-ethoxy, 8-ethylthio and 8-hydroxy derivatives of 3-fluoro-10-(4-methylpiperazino)-10,11-dihydrodibenzo[b,f]thiepin

1982 ◽  
Vol 47 (5) ◽  
pp. 1382-1391 ◽  
Author(s):  
Jiří Jílek ◽  
Josef Pomykáček ◽  
Jiřina Metyšová ◽  
Miroslav Protiva
Keyword(s):  
Acetic Acid ◽  
Polyphosphoric Acid ◽  
Prolonged Action ◽  
Substitution Reactions ◽  
Methoxy Derivative ◽  
Chloro Derivatives ◽  
Boron Tribromide ◽  
Derivatives Of ◽  
Central Depressant ◽  
Boiling Toluene

Acids IIa-c were prepared by reactions of (4-fluoro-2-iodophenyl)acetic acid with 4-methoxythiophenol, 4-ethoxythiophenol and 4-(ethylthio)thiophenol and cyclized with polyphosphoric acid in boiling toluene to dibenzo[b,f]thiepin-10(11H)-ones IIIa-c. Reduction with sodium borohydride afforded the alcohols IVa-c which were treated with hydrogen chloride and gave the chloro derivatives Va-c. Substitution reactions with 1-methylpiperazine resulted in the title compounds Ia-c out of which the methoxy derivative Ia was transformed by demethylation with boron tribromide to the phenol Id. Compounds Ia-d are very potent neuroleptics exhibiting a clear prolongation of the central depressant and some prolongation of the cataleptic activity.

Solvent effect on acid–base clustering between acetic acid and pyridine

1998 ◽  
pp. 95-100 ◽  
Author(s):  
Yoshikatsu Akiyama ◽  
Akihiro Wakisaka ◽  
Fujio Mizukami ◽  
Kengo Sakaguchi
Keyword(s):  
Acetic Acid ◽  
Solvent Effect ◽  
Acid Base

scholarly journals Computational notes on the electronic properties of carboxylic acid

2020 ◽  
Vol 9 (2) ◽  
pp. 1079-1082
Keyword(s):  
Acetic Acid ◽  
Carboxylic Acid ◽  
Electronic Properties ◽  
Carboxylic Acids ◽  
Normal Mode ◽  
Normal Modes ◽  
Carboxyl Groups ◽  
Vibrational Characteristics ◽  
Vibrational Features ◽  
Acetic Acids

The present work describing the electronic properties and vibrational characteristics of carboxylic acids. Acetic acid is chosen as model molecules then optimized at B3LYP/6-31g(d,p) level of theory. The vibrational frequencies were calculated at the same level of theory. Band assignments which were calculated as 18 normal modes were assigned as one compare the normal mode coordinates with original one. Band assignments were described indicating the directions of normal modes in terms the vibrating atoms of the acetic acids. It could be concluded that DFT could be a useful tool for elucidation both the structural and vibrational features of carboxylic acids and then further utilized for assignment of the structures contains carboxyl groups which are known as most reactive structures in chemistry, biology and environment.

scholarly journals SYNTHESIS OF ESTERS OF HALOGENOACETIC ACIDS

2020 ◽  
Vol 2020 (3) ◽  
pp. 38-43
Keyword(s):  
Acetic Acid ◽  
Acid Catalyst ◽  
Primary Amines ◽  
Primary Alcohols ◽  
Sulfuric Acid Catalyst ◽  
Nucleophilic Exchange ◽  
Pmr Spectra ◽  
High Yields ◽  
Esterification Reactions ◽  
Acetic Acids

Amidoalkylating reagents containing a phthalimide group are used in the synthesis of hard-to-reach primary amines and complex heterocyclic compounds. These types of amidoalkylating compounds are suitable reagents for nucleophilic substituted reactions in acidic media due to their resistance to acids. Result of reactions of amidoalkylating reagents-N-hydroxyethylphthalimide and N-hydroxymethylphthalimide with aliphatic carbonic acids can also produce new bactericidal and fungicidal esters. In this study, halogen acids reacted with N-hydroxymethylphthalimide monochloric acetic acid, monobromic acetic acid, monoiodic acetic acid, trifluoric acetic acid and trichloroacetic acid, as well as, N-b-hydroxyethylphthaleidyl monohydric acid. As a result of the reactions, new phthalimidomethyl and phthalimidoethyl esters of haloacetic acids were synthesized. The physical properties of crystalline esters have been determined. The structure of these compounds were confirmed by the analysis of their IR and PMR spectra. The esterification reactions of halogenated acetic acids were carried out in a benzene solvent and a sulfuric acid catalyst with primary alcohols, N-hydroxymethylphthalimide and N-β- beta hydroxyethylphthalimide,. It was found that in a benzene solvent, which increases the rate of bimolecular nucleophilic exchange in primary alcohols, phthalimidoethyl esters of halogen acid are formed in high yields, and phthalimidomethyl esters are formed in low yields. It was shown that the reaction of esterification of halogen acids with N-hydroxymethylphthalimide proceeds with monomolecular nucleophilic exchange.

scholarly journals Forms of potassium and sodium in some species of grasses and herbage

2013 ◽  
Vol 35 (1) ◽  
pp. 87-99 ◽  
Author(s):  
Grzegorz Nowak ◽  
Henryk Panak
Keyword(s):  
Acetic Acid ◽  
Dactylis Glomerata ◽  
Mineral Fertilizer ◽  
Taraxacum Officinale ◽  
Poa Annua ◽  
Major Influence ◽  
Festuca Rubra ◽  
Distilled Water ◽  
Pot Culture ◽  
Acetic Acids

The forms of occurence of potassium and sodium were studied in the grasses <i>Dactylis glomerata</i> L., <i>Poa annua</i> L., <i>Festuca rubra</i> L. and dendelion (<i>Taraxacum officinale</i> Web.) treated with increasing mineral fertilizer doses, magnesium and microelements, under conditions of pot culture. The plants took up potassium in amounts greatly exceeding their requirement, and sodium in very small amounts. Mineral NPK doses increased in the tested plants both the content of potassium and sodium forms soluble in trichloroacetic and acetic acids and water. Magnesium and microelements had no major influence on the content of these potassium forms, but they increased the concentration of analogous forms of sodium in <i>Taraxacum officinale</i> and did not influence their accumulation in the grasses. Potassium and sodium compounds were completely extracted from the plants with trichloroacetic, whereas acetic acid extracted 88-95 percent of potassium and 66-74 percent of sodium. Distilled water extracted 70-77 and 28-33 percent of potassium and sodium, respectively.

scholarly journals Zirconia catalysed acetic acid ketonisation for pre-treatment of biomass fast pyrolysis vapours

2018 ◽  
Vol 8 (4) ◽  
pp. 1134-1141 ◽  
Author(s):  
Hessam Jahangiri ◽  
Amin Osatiashtiani ◽  
James A. Bennett ◽  
Mark A. Isaacs ◽  
Sai Gu ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Lewis Acid ◽  
Fast Pyrolysis ◽  
Acid Sites ◽  
Active Species ◽  
Acid Base ◽  
Lewis Acid Sites ◽  
Base Pairs ◽  
Pre Treatment ◽  
Biomass Fast Pyrolysis

Weak Lewis acid sites (and/or resulting acid–base pairs) on monoclinic ZrO2 are identified as the active species responsible for acetic acid ketonisation to acetone.

Suzuki–Miyaura Cross-Couplings under Acidic Conditions

Synthesis ◽  
2019 ◽  
Vol 52 (06) ◽  
pp. 882-892
Author(s):  
Lucas Pruschinski ◽  
Ana-Luiza Lücke ◽  
Tyll Freese ◽  
Sean-Ray Kahnert ◽  
Sebastian Mummel ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Reaction Time ◽  
Sodium Carbonate ◽  
Acid Water ◽  
Reaction Parameters ◽  
Acid Base ◽  
Acetic Acid Water ◽  
Acidic Conditions ◽  
Carbonate Reaction

Suzuki–Miyaura reactions with Pd(PPh3)4 have been carried out using lithium N-phenylsydnone-4-carboxylate as additive, which gave best yields at pH 5.7 in a mixture of acetic acid, water, and sodium carbonate. Reaction parameters such as the Pd source, the solvent, reaction time and temperature, acid, base and carboxylate have been varied and some representative examples of the Suzuki–Miyaura reaction have been examined.

EFFECTS OF HERBICIDE RATES AND TIME OF APPLICATION ON THE CONTROL OF TANSY RAGWORT IN PASTURES

1976 ◽  
Vol 56 (3) ◽  
pp. 605-610 ◽  
Author(s):  
W. N. BLACK
Keyword(s):  
Acetic Acid ◽  
Propionic Acid ◽  
Active Ingredient ◽  
White Clover ◽  
Senecio Jacobaea ◽  
Time Of Application ◽  
Trifolium Repens L ◽  
Dichlorophenoxy Acetic Acid ◽  
Acetic Acids ◽  
Tansy Ragwort

The ester of 2,4-D [(2,4-dichlorophenoxy) acetic acid] at 1.1 kg active ingredient (a.i.)/ha failed to control tansy ragwort (Senecio jacobaea L.) in the late-rosette, bud, and flowering stages of development. Sprays of 2,4-D ester at 2.2 kg/ha were more effective than when applied at 1.1 kg/ha, but repeated treatments were necessary for optimum tansy ragwort control. Comparative dosage levels of the esters of 2,4-D and of 2,4-DB [4-(2,4-dichlorophenoxy) butyric acid] showed 2,4-D giving better control of tansy ragwort when applied at equivalent rates. Control of relatively immature tansy ragwort plants with 2,4-D was not significantly different at the 1.1, 2.2, and 4.5 kg/ha levels, but injury to grasses and white clover (Trifolium repens L.) increased at the higher rates. The ester of 2,4-DB at 2.2 and 4.5 kg/ha effectively controlled seedling and early-rosette tansy ragwort plants only. The quantity of water applied as a spray was critical since the frond-type leaves which fold over one another prevented thorough wetting of the entire foliage with spray volumes under 275 liters/ha. Data obtained over a 4-yr period showed that CMPP (±) 2-[(4-chloro-1-tolyl) oxy) propionic acid], CP 1815 (chlorinated benzoic and cresoxy-acetic acids), 2,3,6-TBA (dimethylamine salt of 2,3,6-trichlorobenzoic acid), 2,4-D acid [weedone 638, emulsifiable concentrate-(2,4-dichlorophenoxy) acetic acid], and fenoprop [2-(2,4,5-trichlorophenoxy) propionic acid] were as effective as the ester of 2,4-D for tansy ragwort control but caused more injury to components of the sward.

(Acylaryloxy)acetic acid diuretics. 1. (2-Alkyl- and 2,2-dialkyl-1-oxo-5-indanyloxy)acetic acids

1977 ◽  
Vol 20 (11) ◽  
pp. 1400-1408 ◽  
Author(s):  
Otto W. Woltersdorf ◽  
S. Jane DeSolms ◽  
Everett M. Schultz ◽  
Edward J. Cragoe
Keyword(s):  
Acetic Acid ◽  
Acetic Acids
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