Stable Carbonium Ions. LXIV: Protonated Carbonic Acid (Trihydroxycarbonium Ion) and Protonated Alkyl (Aryl) Carbonates and Hydrogen Carbonates, and Their Cleavage to Protonated Carbonic Acid and Carbonium Ions. The Possible Role of Protonated Carbonic Acid in Biological Carboxylation Processes

2003 ◽  
pp. 355-360
Author(s):  
George A. Olah ◽  
Anthony M. White
Keyword(s):  
Carbonic Acid ◽  
Alkyl Aryl ◽  
Carbonium Ions ◽  
Hydrogen Carbonates

Metal-Metal Cooperative Bond Activation by Heterobimetallic Alkyl, Aryl, and Acetylide PtII/CuI Complexes

2020 ◽  
Author(s):  
Shubham Deolka ◽  
Orestes Rivada Wheelaghan ◽  
Sandra Aristizábal ◽  
Robert Fayzullin ◽  
Shrinwantu Pal ◽  
...  
Keyword(s):  
Alkyl Group ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Terminal Alkyne ◽  
Alkyl Aryl ◽  
Metal Metal ◽  
The Stability ◽  
Selective Formation ◽  
Organoplatinum Compounds

We report selective formation of heterobimetallic PtII/CuI complexes that demonstrate how facile bond activation processes can be achieved by altering reactivity of common organoplatinum compounds through their interaction with another metal center. The interaction of the Cu center with Pt center and with a Pt-bound alkyl group increases the stability of PtMe2 towards undesired rollover cyclometalation. The presence of the CuI center also enables facile transmetalation from electron-deficient tetraarylborate [B(ArF)4]- anion and mild C-H bond cleavage of a terminal alkyne, which was not observed in the absence of an electrophilic Cu center. The DFT study indicates that the role of Cu center acts as a binding site for alkyne substrate, while activating its terminal C-H bond.

Methylenimmonium ion and the role of resonance and inductive stabilization in carbonium ions

1973 ◽  
Vol 95 (2) ◽  
pp. 458-463 ◽  
Author(s):  
Peter A. Kollman ◽  
William F. Trager ◽  
Steve. Rothenberg ◽  
James E. Williams
Keyword(s):  
Carbonium Ions

A novel role of zeolite NaY in the thermal reaction of alkyl aryl selenoxides in its supercages

2003 ◽  
pp. 498-499 ◽  
Author(s):  
Wanxuan Zhang ◽  
Haitao Yu ◽  
Yu Gao ◽  
Jiben Meng ◽  
Teruo Matsuura
Keyword(s):  
Thermal Reaction ◽  
Alkyl Aryl ◽  
Zeolite Nay

Stable carbonium ions. LXXXI. Alkyl(aryl)halocarbonium ions and haloarylcarbonium ions

1969 ◽  
Vol 91 (11) ◽  
pp. 2955-2961 ◽  
Author(s):  
George A. Olah ◽  
Melvin B. Comisarow
Keyword(s):  
Alkyl Aryl ◽  
Carbonium Ions

scholarly journals A Method for Quantifying the Role of Carbonate Acid, Sulfuric Acid and Nitric Acid in Carbonate Weathering After Modifying the Effect of Evaporite in Qingjiang Karst Catchment

2021 ◽  
Author(s):  
Xinhui He ◽  
Hong Zhou ◽  
Junwei Wan ◽  
Heng Zhao ◽  
Shiyi He
Keyword(s):  
Sulfuric Acid ◽  
Nitric Acid ◽  
Carbonate Rock ◽  
Carbonic Acid ◽  
Hydrodynamic Condition ◽  
Hydrochemical Modeling ◽  
Carbonate Weathering ◽  
Karst Catchment ◽  
The Impact

Abstract Qingjiang river is the second largest tributary of the Yangtze River in Hubei province, it’s also a typical karst catchment. Eighty-two important groundwater samples were collected during high and low water period of 2019. The results show that: (1) The major hydrochemistry types are Ca+Mg-HCO3 and Ca-HCO3, indicate that carbonate weathering is the main source of groundwater chemistry; (2) The results of inverse hydrochemical modeling show that there are two kinds of groundwater-carbonate rock interactions. One is co-dissolution of calcite and dolomite, the other is dedolomitization, and thereinto, dedolomitization is widespread in dolomite aquifers. Furthermore, gypsum has a tendency to dissolve in each aquifer, and the common ion effect of Ca2+ caused by gypsum dissolution promotes dedolomitization. The modeling results suggest that major elements have a good traceability effect on the material source of groundwater. (3) The chemical weathering of carbonate rock is mainly affected by carbonic acid, sulfuric acid and nitric acid. After modifying the impact of evaporite and atmospheric input, the calculations show that the contribution of carbonic acid involved in carbonate weathering is 70.9% (high water period) and 70.0% (low water period). Through statistics of karst springs discharge and contribution of acid involved in carbonate weathering, the two are in a positive relationship. The result can reflect the laws of sulfuric acid and nitric acid under the hydrodynamic condition in different seasons. Therefore, the carbonate weathering should be carefully evaluated in karst areas which have abundant groundwater and the role of groundwater in carbonate weathering is worthy of further study.

Metal-Metal Cooperative Bond Activation by Heterobimetallic Alkyl, Aryl, and Acetylide PtII/CuI Complexes

2020 ◽  
Author(s):  
Shubham Deolka ◽  
Orestes Rivada Wheelaghan ◽  
Sandra Aristizábal ◽  
Robert Fayzullin ◽  
Shrinwantu Pal ◽  
...  
Keyword(s):  
Alkyl Group ◽  
Bond Activation ◽  
Bond Cleavage ◽  
Terminal Alkyne ◽  
Alkyl Aryl ◽  
Metal Metal ◽  
The Stability ◽  
Selective Formation ◽  
Organoplatinum Compounds

We report selective formation of heterobimetallic PtII/CuI complexes that demonstrate how facile bond activation processes can be achieved by altering reactivity of common organoplatinum compounds through their interaction with another metal center. The interaction of the Cu center with Pt center and with a Pt-bound alkyl group increases the stability of PtMe2 towards undesired rollover cyclometalation. The presence of the CuI center also enables facile transmetalation from electron-deficient tetraarylborate [B(ArF)4]- anion and mild C-H bond cleavage of a terminal alkyne, which was not observed in the absence of an electrophilic Cu center. The DFT study indicates that the role of Cu center acts as a binding site for alkyne substrate, while activating its terminal C-H bond.

Role of the Metal, Ligand, and Alkyl/Aryl Group in the Hydrolysis Reactions of Group 10 Organometallic Cations [(L)M(R)]+

2013 ◽  
Vol 32 (23) ◽  
pp. 6931-6944 ◽  
Author(s):  
Matthew J. Woolley ◽  
George N. Khairallah ◽  
Gabriel da Silva ◽  
Paul S. Donnelly ◽  
Brian F. Yates ◽  
...  
Keyword(s):  
Alkyl Aryl ◽  
Aryl Group ◽  
Group 10 ◽  
Organometallic Cations ◽  
Metal Ligand ◽  
Hydrolysis Reactions
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