The Number of Hydride Ions in AlH2Cl Available for Hydrogenolysis of 1,3-Dioxolanes

1971 ◽  
Vol 49 (12) ◽  
pp. 2166-2168 ◽  
Author(s):  
H. A. Davis ◽  
R. K. Brown
Keyword(s):  
Lewis Acid ◽  
Intermediate Compound ◽  
Acid Base ◽  
Base Complex ◽  
Hydride Ion ◽  
Hydride Ions ◽  
Similar Complex

2-Methyl-1,3-dioxolane (1) in ether is hydrogenolyzed completely to 2-ethoxyethanol by an equimolar proportion of AlH2Cl, whereas a 1/2 mol of AlH2Cl hydrogenolyzes 1 mol of 1 only to the extent of 50%. In the latter case, the intermediate compound 2-ethoxyethoxyhydridoaluminum chloride (C2H5OCH2CH2OAlHCl) formed with half of the 2-methyl-1,3-dioxolane, even though it contains a hydride ion, fails to react with the remainder of the dioxolane. This is believed due to the preference of C2H5OCH2CH2OAlHCl to form an internal Lewis acid-base complex rather than form a similar complex with 1, a step essential to facilitate the hydrogenolysis of 1.

Investigation of the Interaction, Rheological and Tribological Properties of Bis(pinacolato)diboron with Lithium Grease During Mechanical Aging

2021 ◽  
Author(s):  
Jia Ren ◽  
Kuiliang Gong ◽  
Gaiqing Zhao ◽  
Xinhu Wu ◽  
Xiaobo Wang
Keyword(s):  
Lewis Acid ◽  
Lewis Base ◽  
Mechanical Degradation ◽  
Fiber Structure ◽  
Acid Base ◽  
Lithium Grease ◽  
Base Complex ◽  
Structure Strength ◽  
Base Grease ◽  
Mechanical Aging

Abstract In this article, Lewis acid–base complex of lithium 12-hydroxystearate (LHS) with diboron compound is formed by the introduction of bis(pinacolato)diboron (B2Pin2) into lithium grease. The interaction between Lewis acid B2Pin2 and Lewis base RCO2− of LHS is characterized by various techniques. Moreover, the rheological and tribological behaviors of the base grease are evaluated at low and moderate temperature, and the results indicate that the addition of B2Pin2 noticeably enhanced the rheological, friction-reducing, and anti-wear (AW) properties of the base grease, which likely owing to the fact that the formation of Lewis acid–base complex is beneficial for improving the soap fiber structure strength, helping to prevent the mechanical degradation of the lithium grease during mechanical aging process.

IR Spectrum of CH3CN−BF3in Solid Neon:  Matrix Effects on the Structure of a Lewis Acid−Base Complex

2007 ◽  
Vol 111 (6) ◽  
pp. 1402-1407 ◽  
Author(s):  
Audrey A. Eigner ◽  
John A. Rohde ◽  
Christopher C. Knutson ◽  
James A. Phillips
Keyword(s):  
Lewis Acid ◽  
Ir Spectrum ◽  
Matrix Effects ◽  
Acid Base ◽  
Base Complex

Assembly of NHC-stabilized 2-hydrophosphasilenes from Si(iv) precursors: a Lewis acid–base complex

2016 ◽  
Vol 45 (48) ◽  
pp. 19290-19298 ◽  
Author(s):  
Debabrata Dhara ◽  
Debdeep Mandal ◽  
Avijit Maiti ◽  
Cem B. Yildiz ◽  
Pankaj Kalita ◽  
...  
Keyword(s):  
Lewis Acid ◽  
Acid Base ◽  
Base Complex

Reaction of an aryldichlorosilane with lithiumarylphosphide leads to 1,2-dihydro-2-chlorophosphasilane which yields NHC-stabilized 2-hydrophosphasilene upon NHC-assisted elimination of HCl.

Hollow fiber formation using Lewis acid : Base complex in the polymer solution

2001 ◽  
Vol 81 (4) ◽  
pp. 908-917 ◽  
Author(s):  
C. C. Pereira ◽  
J. N. M. Souza ◽  
R. Nobrega ◽  
C. P. Borges
Keyword(s):  
Polymer Solution ◽  
Lewis Acid ◽  
Hollow Fiber ◽  
Fiber Formation ◽  
Acid Base ◽  
Base Complex

scholarly journals Investigation of the Interaction, Rheological and Tribological Properties of Bis(pinacolato)diboron with Lithium Grease

2021 ◽  
Vol 69 (4) ◽  
Author(s):  
J. Ren ◽  
K. L. Gong ◽  
G. Q. Zhao ◽  
X. H. Wu ◽  
X. B. Wang
Keyword(s):  
Lewis Acid ◽  
Tribological Properties ◽  
Mechanical Stability ◽  
Lewis Base ◽  
Acid Base ◽  
Tribochemical Reaction ◽  
Lithium Grease ◽  
Base Complex ◽  
Lubrication Film ◽  
Base Grease

AbstractIn this article, Lewis acid–base complex of lithium 12-hydroxystearate (LHS) with diboron compound is formed by the introduction of bis(pinacolato)diboron (B2Pin2) into lithium grease. The interaction between Lewis acid B2Pin2 and Lewis base RCO2− of LHS is characterized by various techniques. Moreover, the rheological and tribological behaviors of the base grease are evaluated at low and moderate temperature. The results indicate that the addition of B2Pin2 can noticeably enhance the rheological property of the base grease because the formation of Lewis acid–base complex is beneficial for improving the soap fiber structure strength, and B2Pin2 could also help reduce the friction and wear of the grease during the sliding process, which likely owing to the boundary lubrication film generated by B2Pin2 adsorption on the rubbing surface and tribochemical reaction between borate esters and steel surfaces. The improvement of mechanical stability and tribological properties is beneficial to increasing the grease service life. Graphical Abstract

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