Efficient and clean synthesis of N-alkyl carbamates by transcarboxylation and O-alkylation coupled reactions using a DBU–CO2 zwitterionic carbamic complex in aprotic polar media

Pérez, Eliseo García; Silva, Michele Odnicki da; Costa, Vanessa C.; Rodrigues-Filho, Ubirajara P.; Franco, Douglas Wagner

doi:10.1016/s0040-4039(02)00697-4

Cited by 128 publications

(54 citation statements)

References 11 publications

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“…We showed 19 that the reaction between amidines and CO 2 (equation 5), which has been widely published in the literature, [20][21][22][23][24][25][26][27][28] is incorrect. Amidines have been reported to react with CO 2 to form a zwitterionic adduct but the literature studies were performed in the presence of at least some water.…”

Section: Development Of New Catalysts For Co 2 Insertion Reactionsmentioning

confidence: 99%

New Tools for CO2 Fixation by Homogeneous Catalysis - Final Technical Report

Jessop¹

2006

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Section: Development Of New Catalysts For Co 2 Insertion Reactionsmentioning

confidence: 99%

New Tools for CO2 Fixation by Homogeneous Catalysis - Final Technical Report

Jessop¹

2006

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“…As we know, amidine groups have reversible reaction with CO 2 in the presence of water forming the intermediate compound carbonate [19][20][21][22][23]. The intermediate compound can be delivered from the high potential energy side to the low potential energy side.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of CO2 Facilitated Transport Channels in Block Copolymer through Supramolecular Assembly

Wang

Shang

et al. 2014

Polymers

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Abstract:In this paper, the molecule 12-amidine dodecanoic acid (M) with ending groups of carboxyl and amidine groups respectively was designed and synthesized as CO 2 -responsive guest molecules. The block copolymer polystyrene-b-polyethylene oxide (PS-b-PEO) was chosen as the host polymer to fabricate a composite membrane through H-bonding assembly with guest molecule M. We attempted to tune the phase separation structure of the annealed film by varying the amount of M added, and investigated the nanostructures via transmission electron microscope (TEM), fourier transform infrared (FT-IR) etc. As a result, a reverse worm-like morphology in TEM image of bright PS phase in dark PEO/M matrix was observed for PS-b-PEO/M1 membrane in which the molar ratio of EO unit to M was 1:1. The following gas permeation measurement indicated that the gas flux of the annealed membranes dramatically increased due to the forming of ordered phase separation structure. As we expected, the obtained composite membrane PS-b-PEO/M1 with EO:M mole ratio of 1:1 presented an evident selectivity for moist CO 2 permeance, which is identical with our initial proposal that the guest molecule M in the membranes will play the key role for CO 2 facilitated transportation since the amidine groups of M could react reversibly with CO 2 molecules in membranes. This work provides a supramolecular approach to fabricating CO 2 facilitated transport membranes.

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“…There have been numerous reports about interactions between CO 2 and tertiary amines [42][43][44][45]. The catalytic utilization in chemical fixation of CO 2 was intensively investigated as well [46][47][48][49][50][51][52]. Therefore, in this work we report a green process for CO 2 fixation by employing the functionalized ion exchange resins, one kind of polystyryl supported tertiary amines, as effective catalysts under mild reaction conditions without any organic solvents and co-catalysts.…”

Section: Introductionmentioning

confidence: 99%