Dethiobiotin Synthetase: The Carbonylation of 7,8-Diaminononanoic Acid Proceeds Regiospecifically via the N7-Carbamate. [Erratum to document cited in CA123:137125]

Biochemistry ◽  
1995 ◽  
Vol 34 (48) ◽  
pp. 15880-15880 ◽  
Author(s):  
Katharine J. Gibson ◽  
George H. Lorimer ◽  
Alan R. Rendina ◽  
Wendy S. Taylor ◽  
Gerald Cohen ◽  
...  
Keyword(s):  
Acid Proceeds

scholarly journals The catalytic and radical mechanism for ethanol oxidation to acetic acid

2019 ◽  
Vol 55 (79) ◽  
pp. 11833-11836 ◽  
Author(s):  
Sotiria Mostrou ◽  
Andreas Nagl ◽  
Marco Ranocchiari ◽  
Karin Föttinger ◽  
Jeroen A. van Bokhoven
Keyword(s):  
Acetic Acid ◽  
Liquid Phase ◽  
Ethanol Oxidation ◽  
Acid Formation ◽  
Radical Mechanism ◽  
Acid Proceeds ◽  
Acetic Acid Formation

Liquid-phase ethanol oxidation to acetic acid proceeds in two steps: catalytic ethanol oxidation and non-catalytic acetaldehyde autoxidation. The balance between the two-steps coincides in the acetic acid formation and provides information for designing selective catalysts.

Kinetics and Mechanism of the Oxidation of Aliphatic Aldehydes by Benzyltrimethylammonium Chlorobromate

1999 ◽  
Vol 23 (5) ◽  
pp. 308-309
Author(s):  
Anupama Bohra ◽  
Pradeep K. Sharma ◽  
Kalyan K. Banerji
Keyword(s):  
Carboxylic Acid ◽  
Kinetics And Mechanism ◽  
Aliphatic Aldehydes ◽  
Acid Proceeds ◽  
Hydride Ion

Oxidation of aliphatic aldehydes by benzyltrimethylammonium chlorobromate to the corresponding carboxylic acid proceeds via the transfer of a hydride ion from the aldehyde hydrate to the oxidant.

scholarly journals Kinetics and mechanism of the Oxidative regeneration of Carbonyl Compounds from Phenylhydrazones by Tetramminecopper(2+) Bis (Permanganate)

2003 ◽  
Vol 2003 (4) ◽  
pp. 184-185
Author(s):  
Raghvendra Shukla ◽  
László Kótai ◽  
Pradeep K. Sharma ◽  
Kalyan K. Banerji
Keyword(s):  
Acetic Acid ◽  
Carbonyl Compounds ◽  
Kinetics And Mechanism ◽  
Aqueous Acetic Acid ◽  
Acid Proceeds ◽  
Oxidative Regeneration ◽  
Rate Determining Step ◽  
Activated Complex

The oxidation of aldo- and keto-phenylhydrazones by tetraamminecopper(2+) bis(permanganate) (TACP), in aqueous acetic acid, proceeds through a mechanism involving the formation of a cyclic activated complex, in the rate-determining step.

scholarly journals Catalytic Hydrogenation of Sorbic Acid using Pyrazolyl Palladium(II) and Nickel(II) Complexes as Precatalysts

2021 ◽  
Vol 74 ◽  
Author(s):  
Oluwasegun E. Olaoye ◽  
Olayinka Oyetunji ◽  
Banothile C.E. Makhubela ◽  
Apollinaire Muyaneza ◽  
Gopendra Kumar ◽  
...  
Keyword(s):  
Catalytic Hydrogenation ◽  
Sorbic Acid ◽  
Nickel Complexes ◽  
Experimental Conditions ◽  
Acid Proceeds ◽  
Hydrogenation Selectivity

ABSTRACT We have prepared several pyrazolyl palladium and nickel complexes ([(L1)PdCl2](1), [(L2) PdCl2](2), [(L3) PdCl2](3), [(L1) NiBr2](4), [(L2) NiBr2](5) and [(L3) NiBr2](6)) by reacting 3,5-dimethyMH-pyrazole (L1), 3,5-di-ferf-butyl-1ZÏ-pyrazole (L2) and 5-ferrocenyl-1Zf-pyrazole(L3) with [PdCl2(NCMe)2] or [NiBr2(DME)] to afford mononuclear palladium and nickel complexes, respectively. These complexes were then investigated as pre-catalysts in the hydrogenation of 2,4-hexadienoic acid (sorbic acid). The active catalysts from these complexes demonstrate significant activities under mild experimental conditions. Additionally, the active catalysts show that the hydrogenation of sorbic acid proceeds in a sequential manner, where the less hindered C=C bond (4-hexenoic acid) is preferentially reduced over the more hindered C=C bond (2-hexenoic acid). Keywords: Pyrazolyl catalysts, sorbic acid, hydrogenation, selectivity.

Acid-promoted hydride transfer from an NADH analogue to a Cr(iii)–superoxo complex via a proton-coupled hydrogen atom transfer

2021 ◽  
Author(s):  
Tarali Devi ◽  
Yong-Min Lee ◽  
Shunichi Fukuzumi ◽  
Wonwoo Nam
Keyword(s):  
Hydrogen Atom ◽  
Radical Cation ◽  
Hydride Transfer ◽  
Hydrogen Atom Transfer ◽  
Atom Transfer ◽  
Acid Proceeds

Acid-promoted hydride transfer from an NADH analogue to a Cr(iii)–superoxo complex in the presence of acid proceeds via the full formation of the NADH analogue radical cation, followed by the decay of the radical, and accompanied then by the formation of NAD+.

Dethiobiotin Synthetase: The Carbonylation of 7,8-Diaminononanoic Acid Proceeds Regiospecifically via the N7-Carbamate

Biochemistry ◽  
1995 ◽  
Vol 34 (35) ◽  
pp. 10976-10984 ◽  
Author(s):  
Katharine J. Gibson ◽  
George H. Lorimer ◽  
Alan R. Rendina ◽  
Wendy S. Taylor ◽  
Gerald Cohen ◽  
...  
Keyword(s):  
Acid Proceeds

scholarly journals The heat of formation of nitrogen iodide

1940 ◽  
Vol 174 (958) ◽  
pp. 425-432
Keyword(s):  
Heat Content ◽  
Heat Of Formation ◽  
Hydriodic Acid ◽  
The State ◽  
Free Ammonia ◽  
Reaction Products ◽  
Bomb Calorimeter ◽  
Acid Proceeds

The reaction chosen for the determination was the decomposition of nitrogen iodide in dilute hydriodic acid according to the equation (with excess hydriodic acid present) 2NH 3 .NI 3 + 5HI = 2NH 4 I + 3HI 3 . This reaction has the advantage that it is unnecessary to prepare the nitrogen iodide in the dry state, a difficulty met with in the method involving the detonation of the substance in some form of bomb calorimeter, quite apart from the complexity of the reaction products in that case. The reaction with hydriodic acid proceeds rapidly, and appears to be quantitative (Chattaway and Orton 1899). A difficulty was encountered when analyses were made of the final products, as it was found that the amount of ammonia obtained was greater than that corresponding to the composition NH 3 .NI 3 . Since the excess varied quite considerably from sample to sample, it was considered to be adsorbed or loosely combined ammonia, such as is frequently met with in compounds containing ammonia. The existence of higher ammines of NI 3 lends support to this view. To overcome the difficulty introduced by this excess of which the state of combination and heat content were unknown, and which it was not considered correct to treat as free ammonia, advantage was taken of the fact that the proportion of excess ammonia could be varied quite considerably. The experiments were considered in pairs, the effect of the excess ammonia being eliminated between them.

scholarly journals A Novel Approach to the Synthesis of 1,3,4-Thiadiazole-2-Amine Derivatives

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5159
Author(s):  
Tatiana S. Kokovina ◽  
Svyatoslav Y. Gadomsky ◽  
Alexei A. Terentiev ◽  
Nataliya A. Sanina
Keyword(s):  
Mass Spectrometry ◽  
Carboxylic Acid ◽  
New Method ◽  
One Pot ◽  
Acid Proceeds ◽  
Novel Approach

The main purpose of the study was the development of a new method for synthesis of 1,3,4-thiadiazol-2-amine derivatives in a one-pot manner using the reaction between a thiosemicarbazide and carboxylic acid without toxic additives such as POCl3 or SOCl2. The reaction was investigated in the presence of polyphosphate ester (PPE). It was found that, in the presence of PPE, the reaction between the thiosemicarbazide and carboxylic acid proceeds in one-pot through three steps with the formation of corresponding 2-amino-1,3,4-thiadiazole. Using the developed approach five, 2-amino-1,3,4-thiadiazoles were synthesized. The structures of all compounds were proven by mass spectrometry, IR, and NMR spectroscopies.

A study of hydrogenation of benzhydrols in the presence of catalytic amount of triflic acid

2000 ◽  
Vol 78 (9) ◽  
pp. 1242-1246 ◽  
Author(s):  
Christophe Waterlot ◽  
Daniel Couturier ◽  
Marc De Backer ◽  
Benoît Rigo
Keyword(s):  
Catalytic Reduction ◽  
Catalytic Amount ◽  
Ionic Hydrogenation ◽  
Triflic Acid ◽  
Acid Proceeds

The ionic hydrogenation of diarylcarbinols by triethylsilane, in the presence of catalytic amount of triflic acid proceeds via dibenzhydryl ethers. These ethers do not disproportionate to benzophenones and diphenylmethanes but are reduced by triethylsilane to diarylmethanes.Key words: catalytic reduction, benzhydrols, dibenzhydryl ethers, triethylsilane.

Sign in / Sign up

Export Citation Format

Share Document