Role of the macrocyclic polyether in the synthesis of N-alkylcarbamate esters from primary amines, CO2 and alkyl halides in the presence of crown-ethers.

Aresta, Michele; Quaranta, Eugenio

doi:10.1016/s0040-4020(01)92239-2

Cited by 146 publications

(84 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Absorption bands at 3439 cm −1 were attributed to N _ H stretch vibration of carbamate (R _ NHCOO − , R: alkyl) 16), 17) . Absorption bands at 1628 cm −1 and 1563 cm −1 and 1488 cm −1 were assigned to NH3 + deformation, C=O stretch and "NCOO" skeletal vibration of alkylammonium carbamate, respectively 18) . Therefore, CO2 is adsorbed on aminosilane-modified SBA-15 through formation of alkylammonium carbamate (Eq.…”

Section: Adsorption-desorption Propertiesmentioning

confidence: 99%

Adsorption of Carbon Dioxide on Aminosilane-modified Mesoporous Silica

Hiyoshi

Yogo

Yashima

2005

J. Jpn. Petrol. Inst.

View full text Add to dashboard Cite

Aminosilane-modified mesoporous silica was prepared by grafting various aminosilanes on mesoporous silica, SBA-15, and the applicability as a novel adsorbent for CO2 capture and separation from flue gases was examined. Pore walls of SBA-15 were modified uniformly with aminosilanes by grafting and relatively high surface area and uniform pore size were retained. Adsorption capacities of CO2 in the presence of water were compared with those in the absence of water by a flow method. Adsorption capacities of aminosilane-modified SBA-15 were comparable in the presence and absence of water vapor. In particular, the adsorption capacity of (3-trimethoxysilylpropyl)diethylenetriamine SBA-15 reached 1.2 mmol g −1 in the presence of water vapor at 333 K, which is comparable to the adsorption capacity of zeolite Na-Y in the absence of water vapor. In addition, these adsorbents were completely regenerated by heating to 423 K in a He flow.

show abstract

Section: Adsorption-desorption Propertiesmentioning

confidence: 99%

Adsorption of Carbon Dioxide on Aminosilane-modified Mesoporous Silica

Hiyoshi

Yogo

Yashima

2005

J. Jpn. Petrol. Inst.

View full text Add to dashboard Cite

show abstract

“…N-cyclohexyl-NA,NA,NB,NB-tetramethylguanidine etc.) or additives such as crown ethers 6 are required to stabilize carbamate anion generated during amine and CO 2 reaction. This difficulty was partly overcome by using tetraethylammonium hydrogen carbonates (TEAHC), 7 and a combination of potassium carbonate and onium salts 8 as catalysts for the synthesis of carbamates from alkyl halides and amines.…”

mentioning

confidence: 99%

Untitled

2001

View full text Add to dashboard Cite

show abstract

“…Both mono-and dimeric N-alkyl substituted carbamic acids have also been detected in solution [12,18,19]. At 293 K, under N 2 , the partial decomposition of the (BnNH 3 )O 2 CNHBn salt, suspended in THF, was followed by IR [18].…”

Section: Reaction With Aminesmentioning

confidence: 98%

Interaction of CO2 with Electron-Rich Moieties

Aresta¹,

Dibenedetto

Quaranta

2016

Reaction Mechanisms in Carbon Dioxide Conversion

Self Cite

View full text Add to dashboard Cite

In this chapter the direct, non-metal-mediated interaction of carbon dioxide with electron-rich elemental or molecular species is discussed. Anionic species such as H À , OH À , and R 3 C À and covalent species such as amines have been taken into consideration, in view of their relevance to systems of potential or real industrial interest. Reaction with the Hydride IonHydrides can be categorized in various classes according to the nature of the bond that links the metal and hydrogen. The following categories can usually be found in the literature: ionic hydrides (hydrides with group 1 and 2 elements), covalent hydrides, polymeric hydrides, metallic hydrides, borderline hydrides, and transition metal complex hydrides. Here the reaction of ionic hydrides with carbon dioxide (CO 2 ) is considered. Transition metal hydrides with the formula L n M-H are discussed in Chap. 4, where the interaction of CO 2 with analogous E-X systems (where E and X are different elements) is discussed.Group 1 and group 2 hydrides are ionic, insoluble in aprotic solvents, and not usable in protic solvents such as water and alcohols because they promptly react with H 2 evolution:The ionic hydrides are thermally very stable and have quite high melting temperatures. Depending on the element, they can melt without (CaH 2 ) or with (LiH, NaH, and others) decomposition. NaH decomposes above 573 K, whereas LiH and CaH 2 are stable up to 900 K.Therefore, the reaction of ionic hydrides with CO 2 mostly implies a heterogeneous, biphasic system in which pressurized CO 2 reacts at a temperature of~473 K with the MH (M ¼ Li, H, K, Rb) or MH 2 (Ca, Ba, Sr) species to afford the relevant formate:

show abstract

Role of the macrocyclic polyether in the synthesis of N-alkylcarbamate esters from primary amines, CO2 and alkyl halides in the presence of crown-ethers.

Cited by 146 publications

References 39 publications

Adsorption of Carbon Dioxide on Aminosilane-modified Mesoporous Silica

Adsorption of Carbon Dioxide on Aminosilane-modified Mesoporous Silica

Untitled

Interaction of CO2 with Electron-Rich Moieties

Contact Info

Product

Resources

About