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Sung Keon Namgoong - One of the best experts on this subject based on the ideXlab platform.
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Trimethyl Borate magnesium halide complex induced one pot homologation reactions of isoquinoline with dialkyl tmp zincate
Tetrahedron Letters, 2012Co-Authors: Sung Keon NamgoongAbstract:Abstract Novel one-pot homologation reactions of isoquinoline with lithium dialkyl-TMP-zincate⋅2MgBrCl/Trimethyl Borate are described. 1-Alkylisoquinolines ( 2 , 3A , 4A, 5A , 6 , and 7 ) and 1-alkyl-3,4-dihydroisoquinolines ( 3B , 4B , and 5B ) are easily prepared under the presented reaction conditions. The role of the B(OMe) 3 /MgBrCl complex is examined in these homologation reactions. The specific reaction mechanisms, including 1,2-migration of the alkyl ligands from 1-isoquinolylzincates, are proposed. The migratory aptitudes of ligands of 1-isoquinolylzincates are also discussed.
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Trimethyl Borate/magnesium halide complex-induced one-pot homologation reactions of isoquinoline with dialkyl-TMP-zincate
Tetrahedron Letters, 2012Co-Authors: Sung Keon NamgoongAbstract:Abstract Novel one-pot homologation reactions of isoquinoline with lithium dialkyl-TMP-zincate⋅2MgBrCl/Trimethyl Borate are described. 1-Alkylisoquinolines ( 2 , 3A , 4A, 5A , 6 , and 7 ) and 1-alkyl-3,4-dihydroisoquinolines ( 3B , 4B , and 5B ) are easily prepared under the presented reaction conditions. The role of the B(OMe) 3 /MgBrCl complex is examined in these homologation reactions. The specific reaction mechanisms, including 1,2-migration of the alkyl ligands from 1-isoquinolylzincates, are proposed. The migratory aptitudes of ligands of 1-isoquinolylzincates are also discussed.
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Trimethyl Borate induced one pot homologation reactions of isoquinoline with di tert butyl tmp zincate
Tetrahedron Letters, 2011Co-Authors: Soo Jung Yoon, So Hyun Jang, Sung Keon NamgoongAbstract:Novel one-pot homologation reactions of isoquinoline and quinoline with di-tert-butyl-TMP zincate/Trimethyl Borate are described. 1-tert-Butyl-3,4-dihydroisoquinoline 1 and 1-tert-butylisoquinoline 2 are formed unexpectedly under the presented reaction conditions with relative ease. A reaction mechanism, including 1,2-migration of the tert-butyl group from 1-isoquinolylzincate, is proposed in detail. Migratory aptitudes of other ligands of isoquinolyl zincates are also discussed.
Hilkka I. Kenttämaa - One of the best experts on this subject based on the ideXlab platform.
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Comparison of Functional Group Selective Ion–Molecule Reactions of Trimethyl Borate in Different Ion Trap Mass Spectrometers
Journal of The American Society for Mass Spectrometry, 2011Co-Authors: Steve C. Habicht, Nelson R. Vinueza, Lucas M. Amundson, Hilkka I. KenttämaaAbstract:We report here a comparison of the use of diagnostic ion–molecule reactions for the identification of oxygen-containing functional groups in Fourier-transform ion cyclotron resonance (FTICR) and linear quadrupole ion trap (LQIT) mass spectrometers. The ultimate goal of this research is to be able to identify functionalities in previously unknown analytes by using many different types of mass spectrometers. Previous work has focused on the reactions of various boron reagents with protonated oxygen-containing analytes in FTICR mass spectrometers. By using a LQIT modified to allow the introduction of neutral reagents into the helium buffer gas, this methodology has been successfully implemented to this type of an ion trap instrument. The products obtained from the reactions of Trimethyl Borate (TMB) with various protonated analytes are compared for the two instruments. Finally, the ability to integrate these reactions into LC-MS experiments on the LQIT is demonstrated.
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comparison of functional group selective ion molecule reactions of Trimethyl Borate in different ion trap mass spectrometers
Journal of the American Society for Mass Spectrometry, 2011Co-Authors: Steve C. Habicht, Nelson R. Vinueza, Lucas M. Amundson, Hilkka I. KenttämaaAbstract:We report here a comparison of the use of diagnostic ion–molecule reactions for the identification of oxygen-containing functional groups in Fourier-transform ion cyclotron resonance (FTICR) and linear quadrupole ion trap (LQIT) mass spectrometers. The ultimate goal of this research is to be able to identify functionalities in previously unknown analytes by using many different types of mass spectrometers. Previous work has focused on the reactions of various boron reagents with protonated oxygen-containing analytes in FTICR mass spectrometers. By using a LQIT modified to allow the introduction of neutral reagents into the helium buffer gas, this methodology has been successfully implemented to this type of an ion trap instrument. The products obtained from the reactions of Trimethyl Borate (TMB) with various protonated analytes are compared for the two instruments. Finally, the ability to integrate these reactions into LC-MS experiments on the LQIT is demonstrated.
R J Burton - One of the best experts on this subject based on the ideXlab platform.
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vapour phase treatment of wood with Trimethyl Borate
The Chemistry of Wood Preservation, 2005Co-Authors: P Vinden, R J Burton, A J BergervoetAbstract:1 ABSTRACT Changes in the wood processing industry, including increasing raw material costs, fluctuations in market demand, higher interest rates and stock holding costs, are demanding more automation and a move to “on-demand” processing rather than production of stock for anticipated demand. A new generation of wood treatment technology is described involving vapour phase application of wood preservatives. The treatment of solid wood has been integrated into the kiln drying process, whereas the treatment of panel products is carried out at ambient temperature and at the board equilibrium moisture content.
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The modelling of the vapour boron treatment ofPinus radiata D. Don@@@Modell der Kesseldruck-Imprägnierung von Pinus radiata D. Don mit Trimethylborat: Part II: Model verification@@@II. Verifizierung des Modells
European Journal of Wood and Wood Products, 1997Co-Authors: J M Evans, R B Keey, John C. F. Walker, R J BurtonAbstract:The boric acid retention profile in a piece of timber which has been treated by the vapour boron process can be accurately predicted by a model which includes both convective and diffusive fluxes if the initial moisture content of the timber is known. The reaction rate between the adsorbed water and Trimethyl Borate is a strong function of the differential heat of adsorption. Therefore, the lower the moisture content (the higher the differential heat of adsorption) the slower the reaction rate and the better the penetration of boric acid. It was found that a binary diffusion representation was adequate and consequently more elaBorate diffusion models were not necessary.
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The modelling of the vapour boron treatment ofPinus radiata D. Don
European Journal of Wood and Wood Products, 1997Co-Authors: J M Evans, R B Keey, John C. F. Walker, R J BurtonAbstract:Two models of the vapour boron timber treatment process have been developed. The first model assumes that Trimethyl Borate and methanol penetrate timber boards by convective fluxes alone. The second model assumes that both convective and diffusive fluxes influence the flow patterns. Initial simulations of the process using these models show that a number of variables affect the boric acid retention profile. Of particular interest are timber moisture content, timber permeability, vessel occupancy, and rate of evaporation of preservative. The model variables of interest will be investigated in Part II of this paper.
J M Evans - One of the best experts on this subject based on the ideXlab platform.
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The modelling of the vapour boron treatment ofPinus radiata D. Don@@@Modell der Kesseldruck-Imprägnierung von Pinus radiata D. Don mit Trimethylborat: Part II: Model verification@@@II. Verifizierung des Modells
European Journal of Wood and Wood Products, 1997Co-Authors: J M Evans, R B Keey, John C. F. Walker, R J BurtonAbstract:The boric acid retention profile in a piece of timber which has been treated by the vapour boron process can be accurately predicted by a model which includes both convective and diffusive fluxes if the initial moisture content of the timber is known. The reaction rate between the adsorbed water and Trimethyl Borate is a strong function of the differential heat of adsorption. Therefore, the lower the moisture content (the higher the differential heat of adsorption) the slower the reaction rate and the better the penetration of boric acid. It was found that a binary diffusion representation was adequate and consequently more elaBorate diffusion models were not necessary.
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The modelling of the vapour boron treatment ofPinus radiata D. Don
European Journal of Wood and Wood Products, 1997Co-Authors: J M Evans, R B Keey, John C. F. Walker, R J BurtonAbstract:Two models of the vapour boron timber treatment process have been developed. The first model assumes that Trimethyl Borate and methanol penetrate timber boards by convective fluxes alone. The second model assumes that both convective and diffusive fluxes influence the flow patterns. Initial simulations of the process using these models show that a number of variables affect the boric acid retention profile. Of particular interest are timber moisture content, timber permeability, vessel occupancy, and rate of evaporation of preservative. The model variables of interest will be investigated in Part II of this paper.
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an innovative method for estimating the reaction rate for the hydrolysis of Trimethyl Borate
IPENZ Annual Conference 1995 Proceedings of: Innovative technology; Volume 2; Papers presented in the technical programme of the IPENZ Annual Conferen, 1995Co-Authors: J M Evans, R B KeeyAbstract:In the vapour boron treatment of timber, Trimethyl Borate reacts with water vapour and residual adsorbed water to form boric acid, which acts as a preservative. In modelling this timber preservation process, this reaction rate must be determined as well as physical parameters such as wood permeability. The hydrolysis of Trimethyl Borate is known to be very fast. To determine the rection rate, Trimethyl Borate and humid air are drawn through a transparent glass tube. Boric acid is deposited on the glass tube, and the point where this white buildup is greatest may be used to estimate the reaction rate. The reaction rate constant so measured, was 6.8 x 10-3 Pa-1 s-1 (standard deviation 0.7 x 10-3 Pa-1 s-1 ).
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The Modelling of Non-steady State Vapour Flow in Pinus Radiata D.Don
1993Co-Authors: Rm Allen, J M Evans, R B Keey, A J Bergervoet, Ba WoodsAbstract:A model of non-steady state vapour flow in Pinus radiata D. Don has been developed by coupling Darcy's equation and the vapour phase continuity equation. The model, verified by experimentation, accurately predicted the pressure rise in the centre of a test specimen. The model will be used in the design of a process for the Trimethyl Borate preservative treatment of timber.
Soo Jung Yoon - One of the best experts on this subject based on the ideXlab platform.
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Trimethyl Borate induced one pot homologation reactions of isoquinoline with di tert butyl tmp zincate
Tetrahedron Letters, 2011Co-Authors: Soo Jung Yoon, So Hyun Jang, Sung Keon NamgoongAbstract:Novel one-pot homologation reactions of isoquinoline and quinoline with di-tert-butyl-TMP zincate/Trimethyl Borate are described. 1-tert-Butyl-3,4-dihydroisoquinoline 1 and 1-tert-butylisoquinoline 2 are formed unexpectedly under the presented reaction conditions with relative ease. A reaction mechanism, including 1,2-migration of the tert-butyl group from 1-isoquinolylzincate, is proposed in detail. Migratory aptitudes of other ligands of isoquinolyl zincates are also discussed.
