Anionic Polymerization of Monomers Containing Functional Groups. 9. Anionic Polymerizations of 4-Vinylphenyl Methyl Sulfide, 4-Vinylbenzyl Methyl Sulfide, and 2-(4‘-Vinylphenyl)ethyl Methyl Sulfide

1997 ◽  
Vol 30 (13) ◽  
pp. 3728-3731 ◽  
Author(s):  
Akira Hirao ◽  
Hideki Shione ◽  
Takashi Ishizone ◽  
Seiichi Nakahama
Keyword(s):  
Functional Groups ◽  
Anionic Polymerization ◽  
Methyl Sulfide ◽  
Ethyl Methyl

Vibrational spectra and crystal structure of ethyl methyl sulfide-mercury(II) chloride complex

1980 ◽  
Vol 69 ◽  
pp. 53-58 ◽  
Author(s):  
Masaaki Sakakibara ◽  
Yoko Yonemura ◽  
Zenzo Tanaka ◽  
Satoshi Matsumoto ◽  
Keiichi Fukuyama ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Vibrational Spectra ◽  
Chloride Complex ◽  
Methyl Sulfide ◽  
Ethyl Methyl

scholarly journals Vibrational Spectra and Molecular Structure of Ethyl Methyl Sulfide

1975 ◽  
Vol 48 (12) ◽  
pp. 3573-3575 ◽  
Author(s):  
Norimasa Nogami ◽  
Hiromu Sugeta ◽  
Tatsuo Miyazawa
Keyword(s):  
Molecular Structure ◽  
Vibrational Spectra ◽  
Methyl Sulfide ◽  
Ethyl Methyl

scholarly journals The millimeter-wave spectrum and astronomical search for ethyl methyl sulfide

2020 ◽  
Vol 639 ◽  
pp. A129
Author(s):  
C. Cabezas ◽  
C. Bermúdez ◽  
B. Tercero ◽  
J. Cernicharo
Keyword(s):  
Internal Rotation ◽  
Excited States ◽  
Millimeter Wave ◽  
Wave Spectrum ◽  
Potential Candidate ◽  
Rotational Spectrum ◽  
Methyl Sulfide ◽  
Ethyl Methyl ◽  
Abundant Element ◽  
High Level

Context. Sulfur-containing molecules constitute only 8% of the molecules observed in the interstellar medium (ISM), in spite of the fact that sulfur has been shown to be an abundant element in the ISM. In order to understand the chemical behavior of the ISM and specific cases like the missing sulfur reservoir, a detailed chemical molecular composition in the ISM must be mapped out. Aims. Our goal is to investigate the rotational spectrum of ethyl methyl sulfide, CH3CH2SCH3, which seems to be a potential candidate for observation in the ISM since the simpler analogs, CH3SH and CH3CH2SH, have already been detected. Rotational spectrum of ethyl methyl sulfide has been observed before, but its experimental rotational parameters are not precise enough to allow its detection in the ISM. Methods. The rotational spectrum of ethyl methyl sulfide in the frequency range 72−116.5 GHz was measured using a broadband millimeter-wave spectrometer based on radio astronomy receivers with fast Fourier transform backends. The spectral searches and identification of the vibrational excited states of ethyl methyl sulfide was supported by high-level ab initio calculations on the harmonic and anharmonic force fields. Results. The rotational spectra for the trans and gauche conformers of ethyl methyl sulfide was analyzed, and a total of 172 and 259 rotational transitions were observed for each one, respectively. The observation of A − E internal rotation splittings allowed the experimental determination of the V3 hindered internal rotation barrier height for both trans and gauche species. In addition, the vibrational excited states, resulting from the lowest frequency vibrational mode ν30 were identified for both conformers. The new experimental rotational parameters were employed to search for ethyl methyl sulfide in the warm and cold molecular clouds Orion KL, Sgr B2(N), B1-b and TMC-1, using the spectral surveys captured by IRAM 30 m at 3 mm and 2 mm.

Recent Advances in Anionic Synthesis of Functionalized Polymers

1991 ◽  
Vol 64 (4) ◽  
pp. 648-660 ◽  
Author(s):  
Roderic P. Quirk ◽  
Jian Yin ◽  
Shao-Hua Guo ◽  
Xiao-Wei Hu ◽  
Gabriel J. Summers ◽  
...  
Keyword(s):  
Functional Groups ◽  
Anionic Polymerization ◽  
Functional Group ◽  
Polymer Chains ◽  
Synthetic Methods ◽  
Chain Extension ◽  
Functionalized Polymers ◽  
Anionic Polymer ◽  
Living Polymerizations ◽  
Recent Developments

Abstract There has been growing interest and research on new synthetic methods for the preparation of well-defined polymers with in-chain and chain-end functional groups. These functional groups in polymers can participate in (a) reversible ionic association; (b) chain extension, branching or crosslinking reactions with polyfunctional reagents; (c) coupling and linking with reactive groups on other oligomer or polymer chains; and (d) initiation of polymerization of other monomers. It is noteworthy that the use of end-functionalized polybutadienes formed by reaction of poly(butadienyl)lithium with 4,4′-bis(diethylamino)-benzophenone has been reported to provide marked improvements in the wear and traction properties of tires. In order to exploit the unique potential of functionalized polymers, it is important to consider the scope and limitations of current functionalization methodology using anionic polymerization. Anionic polymerization approaches the goal of synthesizing polymers with predictable, well-defined structures in certain systems such as diene, styrene, methacrylate, and heterocyclic monomers, which proceed in the absence of chain termination and chain transfer reactions. These living polymerizations generate stable, anionic polymer chain ends when all of the monomer has been consumed. In principle, these anionic chain ends can react with a variety of electrophilic species to generate a diverse array of functional groups. Unfortunately, many of the reported functionalization reactions have not been well characterized. Another limitation of the use of specific electrophilic functionalization reactions is the necessity of developing, optimizing, and characterizing new procedures for each different functional group. Variables such as chain-end structure, solvent, temperature, concentration, stoichiometry, mode of addition of reagents, and polar additives can have dramatic effects on yield and product distributions. This review will first provide a critical overview of some recent developments in the use of specific functionalization reactions to prepare polymers labeled with carboxyl, hydroxyl, amino, and sulfonate end groups via alkyllithium-initiated polymerization methods. In addition, a recently developed methodology will be described which utilizes the addition reactions of organolithium compounds to substituted 1,1-diphenylethylenes as a general, quantitative functionalization reaction, independent of the specific functional group.

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