Über die Darstellung einiger p-substituierter Styrolderivate

Braun, Dietrich; Keppler, Hans‐Georg

doi:10.1007/bf00905720

Cited by 13 publications

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“…Preparation of the thiol 1: The monomer 1 was achieved by using modified procedures of Braun and Keppler, [25] Sieber and Ulbricht. [26] The thiol group was obtained using the Bunte salt method.…”

Section: Methodsmentioning

confidence: 99%

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

Bartz¹,

Terfort²,

Knoll³

et al. 2000

Chem. Eur. J.

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Gold-coated glass slides have be patterned by using self-assembled monolayers (SAM) of alkane thiols. Through the use of a special thiol terminated with a styrene monomer, microstructures of 5 to 10 microm width and 70 A height have been formed on the surface by graft polymerization of styrene. These patterned gold slides have then been used to template the precipitation of thin titania films from ethanolic solutions of titanium isopropoxide to create microstructured architectures in the film. Plasmon resonance spectra have established the presence of different steps in the process and have been used to follow the kinetics of the precipitation of titania on the surface. The structured TiO2 films have been characterized by scanning electron microscopy.

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Section: Methodsmentioning

confidence: 99%

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

Bartz¹,

Terfort²,

Knoll³

et al. 2000

Chem. Eur. J.

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“…If the chemoselective polymerization of each function proceeds well, the ideal linear polymer bearing another polymerizable function in each monomer unit can be obtained. However, it has been reported that the free-radical polymerization of 4-ethynylstyrene gives the insoluble polymeric product only in low yield, probably due to the serious cross-linking of the polymer …”

Section: Introductionmentioning

confidence: 99%

Anionic Polymerization of Monomers Containing Functional Groups. 13. Anionic Polymerizations of 2-, 3-, and 4-(3,3-Dimethyl-1-butynyl)styrenes, 2-, 3-, and 4-(1-Hexynyl)styrenes, and 4-(Phenylethynyl)styrene

et al. 1998

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The anionic polymerizations of 4-, 3-, and 2-(3,3-dimethyl-1-butynyl)styrenes (3a, 3b, and 3c), 4-, 3-, and 2-(1-hexynyl)styrenes (4a, 4b, and 4c), and 4-(phenylethynyl)styrene (5) were carried out in THF at −78 °C with oligo(α-methylstyryl)dipotassium and sec-butyllithium. The polymerizations of these monomers proceeded quantitatively at −78 °C for 0.5 h. The resulting polymers all possessed the predicted molecular weights based on the molar ratios of monomer to initiator and the narrow molecular weight distributions (M w/M n = 1.03−1.15). The living character of the propagating carbanion derived from these monomers was further confirmed by the quantitative initiation efficiency in the second-stage polymerization. A variety of novel block copolymers with well-defined chain structures were synthesized by the sequential block copolymerization of 3a, 4a, 5, and 4-((trimethylsilyl)ethynyl)styrene (1a) with isoprene, styrene, 2-vinylpyridine, and tert-butyl methacrylate. Furthermore, the relative reactivities of the monomers and the resultant living polymers were evaluated from the results of the anionic block copolymerizations. Higher reactivity of 3a, 4a, 5, and 1a and lower nucleophilicity of their living polymers were clearly demonstrated, compared with those of styrene and living polystyrene, respectively. Both of these features can be explained by the electron-withdrawing character of the ethynyl substituents and the extended π-conjugation system including the carbon−carbon triple bond. The anionic polymerizabilities of 3a, 4a, 5, and 1a are estimated to be the same level of 2-vinylpyridine.

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Über die herstellung von poly‐p‐(ω‐lithiumalkyl)‐styrolen und ihre anwendung als polymere metallierungsmittel

Hallensleben

1973

Angew. Makromol. Chem.

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Poly-p-(w-lithiumalky1)-styrole mit n = 1-4 wurden synthetisiert durch Umsetzung der entsprechenden Halogenverbindungen mit n-Butyllithium. Diese metallorganischen Polymeren lessen sich ak polymere Metallierungsmittel gegenuber Alkyl-und Arylhalogeniden sowie CH-aciden Verbindungen in Austauschreaktionen verwenden und sind dmin in ihrer Aktivitiit dem n-Butyllithium vergleichbar. Im Falle der Austauschreaktion mit Halogenverbindungen sind die Reagentien regenerierbar und lassen sich &her oftmals verwenden; allerdings nimmt dabei die Zahl der aktiven Stellen infolge gelegentlich auftretender WuRTz-FITTIC-Reektionen mit dem Substrat stiindig ab. SUMMARY:Poly[p-(w-lithium alkyl)styrene] with n = 1 to 4 were synthesized by reaction of the corresponding halogen compounds with n-butyl lithium. These organometallic polymers are useful metallating agents in interconversion reactions with halogen compounds as well as CH acidic substances, and their ectivity may be compared to that of n-butyl lithium. I n halogen metal interconversion reactions the polymeric reagents may be used in many runs because their reactivation is easy to accomplish. However, some decrease of the number of active sites along the chain h a been observed on account of WURTZ-FITTIG reactions between the polymer and the substrate. 147 M. L. HALLENSLEBEN Einleitung

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Über die Darstellung einiger p-substituierter Styrolderivate

Cited by 13 publications

References 0 publications

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

Stamping of Monomeric SAMs as a Route to Structured Crystallization Templates: Patterned Titania Films

Anionic Polymerization of Monomers Containing Functional Groups. 13. Anionic Polymerizations of 2-, 3-, and 4-(3,3-Dimethyl-1-butynyl)styrenes, 2-, 3-, and 4-(1-Hexynyl)styrenes, and 4-(Phenylethynyl)styrene

Über die herstellung von poly‐p‐(ω‐lithiumalkyl)‐styrolen und ihre anwendung als polymere metallierungsmittel

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