Preparing methylamines

Kiyoura, Tadamitsu; Terada, K.

doi:10.1016/0144-2449(95)99135-a

Cited by 6 publications

(8 citation statements)

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“…In marked contrast, opposite changes in C c (runs 2 and 1) and C 0 (runs 2 and 5) result in incomplete l -sorbose conversion. From the data corresponding to runs 2, 6, and 7, an increase or decrease in C NaHCO 3 changes the pH of the reaction medium, which has an overall negative effect on the selectivity of the transformation of l -sorbose to 2-keto- l -gulonic acid …”

Section: Resultsmentioning

confidence: 99%

Platinum-Containing Hyper-Cross-Linked Polystyrene as a Modifier-Free Selective Catalyst for l-Sorbose Oxidation

et al. 2001

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Impregnation of hyper-cross-linked polystyrene (HPS) with tetrahydrofuran (THF) or methanol (ML) solutions containing platinic acid results in the formation of Pt(II) complexes within the nanocavities of HPS. Subsequent reduction of the complexes by H2 yields stable Pt nanoparticles with a mean diameter of 1.3 nm in THF and 1.4 nm in ML. The highest selectivity (98% at 100% conversion) measured during the catalytic oxidation of L-sorbose in water is obtained with the HPS-Pt-THF complex prior to H2 reduction. During an induction period of about 100 min, L-sorbose conversion is negligible while catalytic species develop in situ. The structure of the catalyst isolated after the induction period is analyzed by X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. Electron micrographs reveal a broad distribution of Pt nanoparticles, 71% of which measure less than or equal to 2.0 nm in diameter. These nanoparticles are most likely responsible for the high catalytic activity and selectivity observed. The formation of nanoparticles measuring up to 5.9 nm in diameter is attributed to the facilitated intercavity transport and aggregation of smaller nanoparticles in swollen HPS. The catalytic properties of these novel Pt nanoparticles are highly robust, remaining stable even after 15 repeated uses.

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Section: Resultsmentioning

confidence: 99%

Platinum-Containing Hyper-Cross-Linked Polystyrene as a Modifier-Free Selective Catalyst for l-Sorbose Oxidation

et al. 2001

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“…The single production processes are enhanced when the relevant Yukawa coupling constants of φff ( ′ ) are large. The cross sec-tions of these processes have been studied extensively [8,56,57,62], mainly for the MSSM or for the Type-II 2HDM.…”

Section: A Cross Sectionsmentioning

confidence: 99%

“…We note that in Ref. [62], the cross sections without including the decay of additional Higgs bosons have been studied in the MSSM, while in our paper we study the cross sections of the four-particle final-states by including the decays of additional Higgs bosons in the 2HDMs with four types of Yukawa interaction.…”

Section: B Contour Plotmentioning

confidence: 99%

“…[60,61] where Q = t and b. The discovery potential for additional Higgs bosons through single and pair production processes at linear collider are evaluated in the MSSM [62], which is useful in distinguishing the MSSM from the other models.…”

Section: Introductionmentioning

confidence: 99%

“…Cross sections of e + e − → tbH − process at the ILC √ s = 500 GeV and 1 TeV.for given masses of additional Higgs bosons and tan β with setting sin(β − α) = 1, and draw contour curves where the cross sections are 0.1 fb[62]…”

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confidence: 99%

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Complementarity in direct searches for additional Higgs bosons at the LHC and the International Linear Collider

2014

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We discuss complementarity of discovery reaches of heavier neutral Higgs bosons and charged Higgs bosons at the LHC and the International Linear Collider (ILC) in two Higgs doublet models (2HDMs). We perform a comprehensive analysis on their production and decay processes for all types of Yukawa interaction under the softly-broken discrete symmetry which is introduced to avoid flavour changing neutral currents, and we investigate parameter spaces of discovering additional Higgs bosons at the ILC beyond the LHC reach. We find that the 500 GeV run of the ILC with the integrated luminosity of 500 fb −1 shows an advantage for discovering the additional Higgs bosons in the region where the LHC cannot discover them with the integrated luminosity of 300 fb −1 . For the 1 TeV run of the ILC with the integrated luminosity of 1 ab −1 , production processes of an additional Higgs boson associated with the top quark can be useful as discovery channels in some parameter spaces where the LHC with the integrated luminosity of 3000 fb −1 cannot reach. It is emphasized that the complementary study at the LHC and the ILC is useful not only to survey additional Higgs bosons at the TeV scale, but also to discriminate types of Yukawa interaction in the 2HDM.

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Methylamines

Turcotte

Hayes

2001

Kirk-Othmer Encyclopedia of Chemical Technology

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Methylamines are derivatives of ammonia with one, two, or all three hydrogen atoms replaced by methyl groups. Amines with alkyl groups of 2‐6 carbons are known as aliphatic amines, and amines with still larger alkyl groups are known as fatty amines. Methylamines are soluble in various organic solvents. All have a strong fishy odor. Methylamines are toxic, colorless gases or compressed liquids. They are highly flammable. Methylamines can be prepared by a variety of methods. Commercial processes involve reaction of methanol with ammonia to form the corresponding mono‐, di‐, and tri‐methylamines. Methylamines are used as intermediates for the manufacture of solvents, agricultural chemicals, water treatment chemicals, pharmaceuticals, surfactants, rubber chemicals, and food/feed additives.

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Preparing methylamines

Cited by 6 publications

References 0 publications

Platinum-Containing Hyper-Cross-Linked Polystyrene as a Modifier-Free Selective Catalyst for l-Sorbose Oxidation

Platinum-Containing Hyper-Cross-Linked Polystyrene as a Modifier-Free Selective Catalyst for l-Sorbose Oxidation

Complementarity in direct searches for additional Higgs bosons at the LHC and the International Linear Collider

Methylamines

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