Vinyl phenyl acetate

As the main part of the GI-POFs is composed of PMMA, the loss spectrum is nearly the same as that of SI-POF with PMMA core. The attenuation loss of GI-POF with the gel-copolymerization technique at 652 nm is 134 dB/kra Koike s group, Keio University, has used an interfacial-gel-polymerization technique where bro-mobenzene or other chemicals are used as unreactive components instead of vinyl phenyl acetate or vinyl benzoate in the interfacial-gel-copolymerization method. An attenuation loss of 90 dB/km at 572 nm was obtained. MMA-dg was also used as a monomer instead of MMA, and the deuterated polymer core GI-POF was successfully fabricated. Fluorinated acrylate monomer was also used to fabricate moisture-resistant GI-POF. Attenuation losses of 113 and 155 dB/km at 780 nm wavelength were obtained for deuterated and fluorinated POFs, respectively. These POFs are Oj pected to serve as the signal transmission medium with high information capacities in local area network systems. However, this GI-POF has not been commercially available so far because of the fabrication difficulty of the technique in a mass production level with reasonable attenuation loss and fabrication cost. 

In the spectra of vinyl or phenyl esters, with unsaturation adjacent to the C—O— group, a marked rise in the carbonyl frequency is observed along with a lowering of the C—O frequency. Vinyl acetate has a carbonyl band at 1776 cm-1 phenyl acetate absorbs at 1770 cm-1. 

The C—C(=0)—O band of saturated esters, except for acetates, shows strongly in the 1210-1163 cm"1 region. It is often broader and stronger than the C=0 stretch absorption. Acetates of saturated alcohols display this band at 1240 cm"1. Vinyl and phenyl acetates absorb at a somewhat lower frequency, 1190-1140 cm"1 for example, see Figure 2.25. The C—C(=0)—O stretch of esters of a,/3-unsaturated acids results in multiple bands in the 1300-1160 cm"1 region. Esters of aromatic acids absorb strongly in the 1310-1250 cm"1 region. 

Details of /S-carbon substituent effects have been explored, but not without giving some anomalies. Electron releasing groups such as / -methyl increase the rate of elimination, but by considerably smaller amounts than found with a-sub-stitution. Groups which are electron withdrawing by a field or inductive effect, such as /S-methoxy, / -ethoxy and -dimethylamino, retard the rate. In contrast, /J-substitution of groups with r-electron sytems accelerate the rate as seen by / -phenyl, ) -vinyl and ) -acetyl. Substituted 2-phenyl acetates (Table 2-5) show a small spread in rate, but give a reasonable correlation with where p = 0.3. 

Phenyl acetic acid. Hydro cinnamic acid. Cinnamic acid or Phenyl acrylic acid Phenyl propiolic acid. Phenyl vinyl acetic acid. 

TABLE VI. Extinction coefficient of some products of the photo Fries reaction of poly 4-vinyl phenyl benzoate). Poly VB Poly (4-vinyl benzaldehyde) obtained by treating the copolymer with its dimethyl acetal by acidic solution. 

A new synthesis was developed by Y. Kashman et al. for the preparation of the parent pyrido[2,3,4-/c/]acridine skeleton utilizing the Doebner-Miller synthesis. In the first step, 3-aminoacetanilide was reacted with vinyl phenyl ketone in the presence of m-nitrobenzenesulfonic acid sodium salt and acetic acid to afford the corresponding 4-phenylquinolines. The acetamide group was then converted to the corresponding aryl azide, which underwent intramolecular nitrene insertion upon thermolysis to give the desired heterocyclic skeleton. 

Ozonolysis of vinylpyrazine in methanol at — 30° furnishes pyrazine aldehyde in 73% yield.196 Vinylpyrazine undergoes a variety of addition reactions and pyrazylethyl derivatives of amines, ketones, ethyl phenyl acetate, phenylacetonitrile, and acetamide have been obtained.197-199 2-(2-Pyrazylethyl)cyclohexanone (42) has been prepared both by the condensation of vinylpyrazine with cyclohexanone in the presence of sodium metal and by interaction of vinyl-pyrazine with the pyrrolidine enamine of cyclohexanone followed by hydrolysis.200... 

The log k values were correlated with two other sets of data. When plotted against the log k for reaction of the [(p-dimethylamino)-phenyl]tropylium ion with nucleophiles, two approximately parallel lines, one for reactions in MeOH and one for reactions with water, were obtained. A plot of log k for the reaction of 9 versus log k for the reaction of 2,4-dinitro-phenyl acetate with several nucleophiles was linear thus, similarities existed in the transition states for nucleophilic attack on activated vinylic and aromatic carbon. 

Very recently, it has been demonstrated [76] that the hosts (RR)-(29) and (R)- 59), complexed to KOCMej or KNHj, catalyse the Michael additions of methyl vinyl ketone and methyl acrylate to the phenyl acetic esters (61) and (62), and the )8-ketoester (63) with high catalytic turnover numbers (CTN = mmoles of product... 

TEA or trioctylamine, and vinyl acetate as the acyl donor, led to the corresponding chiral acetate in yields above 68% and enantioselectivities of 80-97% ee. In 2006, Wolfson et al. reported the DKR of 1-phenylethanol by hydrated ruthenium chloride in an aqueous medium using Novozym 435 as the lipase. ° This novel process, involving phenyl acetate as the acyl donor, led to the formation of the corresponding chiral acetate in 82% yield and 98% ee. Besides its low price and ideal environmental impact, performing the reaction in an... 

A lipase-catalyzed acylation of comb-like methacrylate polymers was induced through OH groups in the side chains using the activated esters, vinyl acetate, phenyl acetate, 4-fluorophenyl acetate, and phenyl stearate, as acylating agents. The OH groups in the side chains of the methacrylate/styrene copolymer were... 

Other vinyl polymers that have heen examined include vinylidene chloride — methyl methacrylate [76], vinylidene chloride — phenyl acetate [77], vinyl chloride — butadiene [78], vinyl copolymers [79] and vinylidene chloride - polyethylene [80]. 

Alternately, the acetal-protected polymers have also been prepared by chemical modification on poly(vinylphenol) by reacting the polymer with vinyl ethers using PFTS as the catalyst. ile satisfactory results were obtained with chemical modification using methyl vinyl ether, the reaction with vinyl phenyl ether showed a low efficiency of blocking the phenolic groups as FT-IR studies indicated that the chemically modified polymer still showed some unprotected... 

Tetrazole, 2-methyl-5-vinyl-Tetrazole, 2-phenyl-5-(4 -vinyl)phenyl- Vinyl acetate 28.51 31.34 0.04 0.16 Y 670... 

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