Solvolytic reactions of Lewis acids in dichloroacetic acid and the nature of the solvolysed products

1978 ◽  
Vol 31 (5) ◽  
pp. 967
Author(s):  
KC Malhotra ◽  
G Mehrotra ◽  
VP Mahajan ◽  
SC Chaudhry
Keyword(s):  
Molecular Weight ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Dichloroacetic Acid ◽  
Antimony Pentachloride ◽  
Titanium Zirconium ◽  
Aluminium Trichloride ◽  
Acid Character

Tetrachlorides of tin, titanium, zirconium, thorium and silicon form compounds of composition SnCl2(CHCl2COO)2, Ti(CHCl2COO)4, Zr(CHCl2COO)4, Th(CHCl2COO)4 and Si2O(CHCl2COO)6 when refluxed with excess of dichloroacetic acid. From i.r., molecular weight and conductance studies, their structures have been elucidated. Their Lewis acid character is established by isolating and characterizing their adducts with organic tertiary bases. Antimony pentachloride, aluminium trichloride and iron(III) trichloride form compounds of composition SbCl2(CHCl2COO)3, Al(CHCl2COO)3 and FeCl(CHCl2COO)2 when refluxed with excess of the solvent and these have been characterized by i.r. studies.

Complexes of acetic anhydride and Lewis acids and bases

1974 ◽  
Vol 27 (7) ◽  
pp. 1413 ◽  
Author(s):  
KC Malhotra ◽  
DS Katoch
Keyword(s):  
Molecular Weight ◽  
Acetic Anhydride ◽  
Lewis Acids ◽  
Molar Conductance ◽  
Spectral Studies ◽  
Antimony Pentachloride ◽  
Donor Acceptor ◽  
Acids And Bases ◽  
Lewis Acids And Bases

Acetic anhydride forms compounds of 1 : 1 composition with trihalides of boron, aluminium, with antimony pentachloride, and with the trioxides of sulphur and selenium, of 1 : 2 composition with tetrahalides of tin and titanium. From molar conductance, molecular weight determinations and i.r. spectral studies, these are found to be simple donor-acceptor complexes. However, in the case of antimony pentachloride and aluminium tribromide, the presence of acetylium ion is indicated.A number of bases also form 1 : 1 compounds with acetic anhydride. From molar conductance and i.r. spectral studies, their structures have also been elucidated.

Bonding between electron-deficient atoms: strong Lewis-acid character preserved in X–Y–X (X = B, Al; Y = Be, Mg) bridges

2020 ◽  
Vol 44 (27) ◽  
pp. 11870-11878
Author(s):  
Maxime Ferrer ◽  
M. Merced Montero-Campillo ◽  
Otilia Mó ◽  
Manuel Yáñez ◽  
Ibon Alkorta ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Lewis Acids ◽  
Covalent Bonds ◽  
Strong Lewis Acid ◽  
Acid Character

Beryllium bis(diazaborolyl) derivatives and their Mg and Al-containing analogues are stable compounds stabilized through covalent bonds between electron-deficient atoms, and behave as good Lewis acids.

Lewis Acid-Promoted Suzuki Reaction using Palladium Chloride Anchored on a Polymer as a Catalyst

2008 ◽  
Vol 61 (8) ◽  
pp. 610 ◽  
Author(s):  
Guozhi Fan ◽  
Hanjun Zhang ◽  
Siqing Cheng ◽  
Zhandong Ren ◽  
Zhijun Hu ◽  
...  
Keyword(s):  
Catalytic Activity ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Heterogeneous Catalysts ◽  
Suzuki Reaction ◽  
Cross Coupling ◽  
Palladium Chloride ◽  
Coupling Reactions ◽  
Cross Coupling Reactions ◽  
Recoverable Catalyst

Palladium chloride anchored on polystyrene modified by 5-amino-1,10-phenanthroline was prepared and used as an efficient recoverable catalyst for Suzuki cross-coupling reactions. The heterogeneous catalysts can be easily separated from the reaction mixture and reused for five cycles without significant Pd leaching and loss of catalytic activity. Rate enhancement in the Suzuki reaction by Lewis acids was also studied.

Synthesis of pyrrolo[1,2-a]naphthyridines by Lewis acid mediated cycloisomerization

2017 ◽  
Vol 15 (15) ◽  
pp. 3216-3231 ◽  
Author(s):  
Anika Flader ◽  
Silvio Parpart ◽  
Peter Ehlers ◽  
Peter Langer
Keyword(s):  
Lewis Acid ◽  
Lewis Acids

Functionalized pyrrolo[1,2-a]naphthyridines were synthesized by application of PtCl2 and Bi(OTf)3 as simple Lewis acids in a cycloisomerization reaction.

Metathetical Degradation and Depolymerization of Unsaturated Polymers

1997 ◽  
Vol 70 (3) ◽  
pp. 519-529 ◽  
Author(s):  
J. C. Marmo ◽  
K. B. Wagener
Keyword(s):  
Molecular Weight ◽  
Transition Metal ◽  
Catalytic System ◽  
Lewis Acid ◽  
Catalyst System ◽  
Metal Catalysts ◽  
Transition Metal Catalysts ◽  
Side Reactions

Abstract The employment of transition metal catalysts has been a viable route in the degradation and depolymerization of unsaturated polymers. Initially, unsaturated polymers were degraded with a catalytic system containing a transition metal and a Lewis acid cocatalyst (WCl6/SnBu4). Degradation chemistry was effective in reducing the molecular weight of the polymer, however, the classical catalyst system induces side reactions which generates ill-defined products. These side reactions were obviated by using a preformed alkylidene without a Lewis acid cocatalyst, and perfectly difunctional telechelics were synthesized.

Merging gold catalysis, organocatalytic oxidation, and Lewis acid catalysis for chemodivergent synthesis of functionalized oxazoles from N-propargylamides

2017 ◽  
Vol 53 (75) ◽  
pp. 10366-10369 ◽  
Author(s):  
Shaoyu Mai ◽  
Changqing Rao ◽  
Ming Chen ◽  
Jihu Su ◽  
Jiangfeng Du ◽  
...  
Keyword(s):  
Transition Metal ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Acid Catalysis ◽  
Gold Catalysis ◽  
One Pot ◽  
Catalytic Systems ◽  
One Pot Synthesis ◽  
The One ◽  
Cationic Gold

Novel catalytic systems consisting of cationic gold complexes, N-hydroxyphthalimide (NHPI), and transition-metal-based Lewis acids have been developed for the one-pot synthesis of functionalized oxazoles.

Synthesis of a bifunctional boron-Lewis acid and studies on host-guest chemistry using pyridine and TMPD

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jens Rudlof ◽  
Beate Neumann ◽  
Hans-Georg Stammler ◽  
Norbert W. Mitzel
Keyword(s):  
Solid State ◽  
Lewis Acid ◽  
Lewis Acids ◽  
Structure Elucidation ◽  
Decomposition Product ◽  
Functional Distance ◽  
Solid State Structures ◽  
Guest Chemistry

Abstract Based on the previously described bifunctional Lewis acid with a functional distance of the boron functions of 4.918(2) Å, the development of a further bifunctional, boron-containing Lewis acid with a wider functional distance is demonstrated. Again, a stannylated precursor was used and the Lewis-acidic boron functions were introduced by means of tin-boron exchange. The general suitability of this class of compounds for the formation of host-guest-complexes is demonstrated by NMR experiments and by solid-state structures using pyridine and TMPD (N 1,N 1,N 4,N 4-tetramethylbenzene-1,4-diamine) as Lewis basic guests. The influence of traces of moisture on the boron-containing, bifunctional Lewis acids was investigated by the structure elucidation of a decomposition product.

scholarly journals Arenium cation or radical cation? An insight into the cyclodehydrogenation reaction of 2-substituted binaphthyls mediated by Lewis acids

RSC Advances ◽  
2020 ◽  
Vol 10 (37) ◽  
pp. 21974-21985
Author(s):  
Patricia Camargo Solórzano ◽  
María T. Baumgartner ◽  
Marcelo Puiatti ◽  
Liliana B. Jimenez
Keyword(s):  
Radical Cation ◽  
Lewis Acid ◽  
Reaction Mechanisms ◽  
Lewis Acids ◽  
Acid Synthesis ◽  
Theoretical Studies ◽  
Insight Into

Cyclodehydrogenation reactions of 2-substituted binaphthyls induced by a Lewis acid. Synthesis and theoretical studies of the reaction mechanisms.

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