trans Opening of Monomer Double Bonds in Anionic Polymerization of Methyl Acrylate Initiated by Lithium Aluminum Hydride

Yoshino, Tsuneo; Shinomiya, Masayasu; Komiyama, Jiro

doi:10.1021/ja01080a047

Cited by 44 publications

(9 citation statements)

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“…Thus, two‐dimensional (2D) NMR techniques are required to resolve the signals. Various 2D NMR14–16 experiments, especially HSQC and TOCSY experiments, have been used to assign the microstructure of the polymers17–24 in terms of compositional and configurational sequences.…”

Section: Introductionmentioning

confidence: 99%

Phase 1 trial of everolimus and gefitinib in patients with advanced nonsmall‐cell lung cancer

Milton

Riely

Azzoli

et al. 2007

Cancer

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Copolymers of styrene and n‐butyl acrylate were prepared by atom transfer radical polymerization (ATRP) using CuBr/N,N,N′,N′,N″‐pentamethyl‐diethylenetriamine as catalyst and Methyl 2‐bromopropionate as initiator. The polydispersity of the copolymers is quite low (1.1–1.3). 13C {1H} NMR spectra of these copolymers show that the methylene and methine signals of the main chain are compositional sensitive and highly overlapped. Even the distortionless enhancement by polarization transfer (DEPT) was not able to assign the complex and overlapping signals. Assignments of the various resonance signals were done with the help of heteronuclear single quantum coherence (HSQC), total correlation spectroscopy (TOCSY), and heteronuclear multiple bond correlation (HMBC) experiments. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci, 2006

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Section: Introductionmentioning

confidence: 99%

Phase 1 trial of everolimus and gefitinib in patients with advanced nonsmall‐cell lung cancer

Milton

Riely

Azzoli

et al. 2007

Cancer

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“…6. 13C NMR spectra of the methylene carbon region of isotactic-rich (I) and random (R)poly(methy1 acry1ate)s in CDCl, at 55 "C; for explanation of numbers at peaks see lhb 3. enough for a quantitative analysis.…”

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Assignment of finely resolved ¹³C NMR spectra of polyacrylates

Kawamura¹,

Toshima²,

Matsuzaki³

1995

Macro Chemistry & Physics

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13C NMR spectra of poly(methy1 acrylate) (PMA), poly(ethy1 acrylate) (PEA), poly-(isopropyl acrylate) (PIPA), poly(buty1 acrylate) (PBA), and poly(isobuty1 acrylate) (PIBA) with various tacticities were determined. It was found that methine carbon resonances of PIPA split into triad sequences and those of PEA, PBA and PIBA show a mrn triad at high field. Methylene carbon spectra of polyacrylates were assigned in terms of hexad sequences using HECTOR (13C-lH COSY) spectra.

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“…, in calculating the population of each form, we adapt the values, Jt = 12,l and Jg = 3,2 Hz from trimethyl cis-hexahydrotrimesate obtained by YOSHINO et a1 14)…”

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A nuclear magnetic resonance study on the conformation and molecular interaction of polyelectrolyte model compound in alcohol/water mixtures

Miyamoto

Cantow

1973

Makromol. Chem.

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The conformation and molecular interaction of polyelectrolyte model compound (2,4-dimethylglutaric acid) in alcohol/water mixtures were investigated by using high resolution NMR spectroscopy.I t is shown that the local conformation of mesa-isomer in alcohol/water mixtures slightly changes with the mole fraction of ethanol. The difference in the chemical shifts of two methylene protons and the chemical shift of carboxyl protons are comparably dependent of the mole fraction of ethanol. These results, however, do not always mean that the change in the viscosity of poly(acry1ic acid) or poly(methacry1ic acid) in alcohol/water mixtures is due to the change of such local conformation as estimated by NMR. On the contrary, it is probably true that such change in the viscosity curve is mainly due to the long-range interaction between non-adjacent segments.It is also shown that the local conformation of mesa-isomer depends upon the use of the solvents, leading to the conclcsion that its local conformation varies with the solvent. ZUSAMMENFASSUNG:Konformation und molekulare Wechselwirkung der Modellverbindung eines Polyelektrolyten (2,4-Dimethylglutarsaure) in Alkohol/Wasser-Gemischen wurden mittels hochauflosender Kernresonanz untersucht.Es wurde gezeigt, daB sich die lokale Konformation der mesomeren 2,4-Dimethylglutarsaure in Alkohol/Wasser-Gemischen mit dem Molenbruch des dthanols leicht andert. Der Unterschied der chemischen Verschiebungen der beiden Methylenprotonen und die Verschiebung der Carboxylprotonen sind in vergleichbarem MaBe vom Molenbruch des dthanols abhangig. Diese Ergebnisse lassen jedoch nicht den SchluR zu, daB die Viskositatsanderungen van Polyacrylsaure oder Polymethacrylsaure in Alkohol/Wasser-Gemischen auf die durch die NMR-Daten belegten dnderungen lokaler Konformationen zuriickzufiihren sind. Tatsachlich diirfte der Gang der Viskositatskurve hauptsachlich auf die weitreichende Ketten-Wechselwirkung nicht benachbarter Segmente zuriickzufuhren sein.Es konnte gleichzeitig gezeigt werden, daB die lokale Konformation der mesomeren 2,4-Dimethylglutarsaure vom Losungsmittel abhangt. Dies legt den SchluR nahe, daB sich die lokale Konformation mit dem Losungsmittel andert.

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trans Opening of Monomer Double Bonds in Anionic Polymerization of Methyl Acrylate Initiated by Lithium Aluminum Hydride

Cited by 44 publications

References 0 publications

Phase 1 trial of everolimus and gefitinib in patients with advanced nonsmall‐cell lung cancer

Phase 1 trial of everolimus and gefitinib in patients with advanced nonsmall‐cell lung cancer

Assignment of finely resolved ¹³C NMR spectra of polyacrylates

A nuclear magnetic resonance study on the conformation and molecular interaction of polyelectrolyte model compound in alcohol/water mixtures

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trans Opening of Monomer Double Bonds in Anionic Polymerization of Methyl Acrylate Initiated by Lithium Aluminum Hydride

Cited by 44 publications

References 0 publications

Phase 1 trial of everolimus and gefitinib in patients with advanced nonsmall‐cell lung cancer

Phase 1 trial of everolimus and gefitinib in patients with advanced nonsmall‐cell lung cancer

Assignment of finely resolved 13C NMR spectra of polyacrylates

A nuclear magnetic resonance study on the conformation and molecular interaction of polyelectrolyte model compound in alcohol/water mixtures

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Product

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Assignment of finely resolved ¹³C NMR spectra of polyacrylates