13406-98-9Relevant articles and documents
Kinetics and mechanisms of gas phase elimination of ethyl 1-piperidine carboxylate, ethyl pipecolinate, and (revisited) ethyl 1-methyl pipecolinate
Rosas, Felix,Monsalve, Angiebelk,Tosta, Maria,Herize, Armando,Dominguez, Rosa M.,Brusco, Doris,Chuchani, Gabriel
, p. 383 - 389 (2005)
The kinetics of the gas-phase elimination of the title compounds has been determined in a static reaction system over the temperature range of 340-420°C and pressure range of 45-96 Torr. The reactions proved to be homogeneous, unimolecular, and obey a first-order rate law. The estimated rate coefficients are represented by the following Arrhenius expressions: Ethyl 1-piperidine carboxylate log k1 (S-1) = (12.61 ± 0.11) - (191.1 ± 1.4) kJ mol-1 (2.303 RT)-1, r = 0.9999 Ethyl pipecolinate log k1 (S-1) = (12.87 ± 0.16) - (204.3 ± 2.1) kJ mol-1 (2.303 RT)-1, r = 0.9998 Ethyl 1-methyl pipecolinate log k1 (S-1) = (13.34 ± 0.32) - (209.4 ± 4.0) kJmol-1 (2.303 RT) -1, r = 0.9992 The first step of decomposition of these esters is the formation of the corresponding carboxylic acids and ethylene. The acid intermediate undergoes a very fast decarboxylation process. The mechanism of this elimination reactions is suggested on the basis of the kinetic and thermodynamic parameters.
Renewable energy storage: Via efficient reversible hydrogenation of piperidine captured CO2
Lu, Mi,Zhang, Jianghao,Yao, Yao,Sun, Junming,Wang, Yong,Lin, Hongfei
, p. 4292 - 4298 (2018/10/02)
The storage of renewable energy is the major hurdle during the transition of fossil resources to renewables. A possible solution is to convert renewable electricity to chemical energy carriers such as hydrogen for storage. Herein, a highly efficient formate-piperidine-adduct (FPA) based hydrogen storage system was developed. This system has shown rapid reaction kinetics of both hydrogenation of piperidine-captured CO2 and dehydrogenation of the FPA over a carbon-supported palladium nano-catalyst under mild operating conditions. Moreover, the FPA solution based hydrogen storage system is advantageous owing to the generation of high-purity hydrogen, which is free of carbon monoxide and ammonia. In situ ATR-FTIR characterization was performed in order to provide insight into the reaction mechanisms involved. By integrating this breakthrough hydrogen storage system with renewable hydrogen and polymer electrolyte membrane fuel cells (PEMFC), in-demand cost-effective rechargeable hydrogen batteries could be realized for renewable energy storage.
Highly efficient and selective formation of hydrogencarbonate in CO 2 absorption process using piperidine and piperazine derivatives
Shin, Man Sub,Park, Yoon Kook,Nam, Sung Chan,Hwang, Kwang-Jin
experimental part, p. 142 - 144 (2012/03/10)
This investigation demonstrated that bicarbonate ions were selectively formed over carbamate in a CO2 absorption process using piperidine and piperazine derivatives based on 13CNMR. Piperidines with methyl or hydroxymethyl substituent at 2 position (PiP-Me and PiP-MeOH) and 2,5-dimethylpiperazine (DM-PiZ) generated the bicarbonate ions as main adducts in reaction with CO2. The absorptions of CO2 by those aqueous amines (PiP-Me and DM-PiZ) were faster than those of MEA (2-aminoethanol).
Mild and convenient synthesis of organic carbamates from amines and carbon dioxide using tetraethylammonium superoxide
Singh, Krishna Nand
, p. 2651 - 2654 (2008/02/12)
A safe and simple method of preparing organic carbamates has been achieved from amines and carbon dioxide using tetraethylammonium superoxide generated in situ. Copyright Taylor & Francis Group, LLC.
Cyclic hydroxamic acids as metalloproteinase inhibitors
-
, (2008/06/13)
The present application de gibes novel cyclic hydroxamic acids of formula I: or pharmaceutically acceptable salt forms thereof, wherein ring B is a 5-7 membered cyclic system containing from 0-2 heteroatoms selected from O, N, NRa, and S(O)p, and 0-1 carbonyl groups and the other variables are defined in the present specification, which are useful as metalloprotease inhibitors.
Phenylureas. Part 1. Mechanism of the basic hydrolysis of phenylureas
Laudien,Mitzner
, p. 2226 - 2229 (2007/10/03)
The mechanism of the hydrolytic decomposition of phenylureas in basic media in the pH range 12 to 14 is investigated. In this pH range a levelling of the rate-pH curve is observed as well as a change of the substituent influence on the hydrolysis rate. These experimental findings suggest the formation of an unreactive side product of the phenylurea in a parasitic side equilibrium at sufficiently high pH. The urea dissociates at the aryl-NH group to give its conjugate base. For the hydrolytic decomposition of phenylureas an addition-elimination mechanism is proposed as has been established for the alkaline hydrolysis of carboxylic acid esters and amides.
