P-Methoxystyrene oxide

Chloro-3,4-dimethoxyphenethylamine p-Methoxystyrene oxide Boron tribromide... 

Chloro-3,4-dimethoxyphenethylamine (1.0 g) was reacted with 0.70 g of p-methoxystyrene oxide to give the hydroxyphenethylamine m.p. 118.5-121°C. This compound (2.16 g) was stirred at room temperature in 15 ml of trifluoroacetic acid with 4 drops of cone, sulfuric acid. After purification over a silica gel column with chloroform, 10% methanol/chloroform as eluates, was obtained 6-chloro-7,8-dimethoxy-l-p-methoxyphenyl-2,3,4,5-tetrahydro-lH-... 

Graft copolymers of nylon, protein, cellulose, starch, copolymers, or vinyl alcohol have been prepared by the reaction of ethylene oxide with these polymers. Graft copolymers are also produced when styrene is polymerized by Lewis acids in the presence of poly-p-methoxystyrene. The Merrifield synthesis of polypeptides is also based on graft copolymers formed from chloromethaylated PS. Thus, the variety of graft copolymers is great. 

When DISN reacts with electron-rich styrenes such as p-methoxystyrene, good yields of reduced pyrazines 117, often accompanied by their oxidized forms, are obtained. However, reaction with electron-deficient styrenes like p-fluorostyrene give the 2-amino-3-(2-arylaziridin-l-yl)maleonitriles (118) (72JA3242 84JOC813). 

Typically, electrochemical oxidation of cyclohexadiene gives only polymer121. However, when extreme care is used a low yield (38%) of the Diels-Alder adduct with p-methoxystyrene is obtained, with an enhanced endo/exo ratio compared to the same reaction using PIET (Scheme 42)122. For most purposes PIET gives sufficiently high... 

When hordinene is treated with methyl sulfate and base, a product, LL, is formed. When LL is oxidized by alkaline KMn04, there is obtained anisic acid, /7-CH3OQH4-COOH. When LL is heated strongly there is obtained p-methoxystyrene. 

The pH-independent reactions of /7-methoxystyrene oxide and of /7-nitrostyrene oxide have different mechanisms than those for reactions of styrene oxides without strongly electron-donating or strongly electron-withdrawing groups. Both of these compounds are much more reactive than predicted from a Hammett sigma-rho plot of log k0bsd versus a for the pH-independent reactions of styrene oxide and its p-methyl and p-chloro derivatives.41 The most likely explanation for the enhanced reactivity of /7-nitrostyrene oxide is that attack of water at the /j-carbon, which is... 

ThFFF, SEC, and light scattering have been used to determine the MWD of anionically polymerised p-methoxystyrene, p-methylstyrene, p-chlorostyrene, and p-cyano-styrene. ThFFF and SEC/multiangle laser light scattering have been used to study the thermal diffusion coefficients of PS, poly( er -butylstyrene) (PtBS) and PS/PtBS copolymer microgels [138]. The retention behaviour of poly(styrene-co-methyl-methacrylate) and poly(styrene-f -iosprene) in ThFFF and SEC have been studied [139]. SEC fractions of blends and copolymers of PS and polyethylene oxide were cross fractionated by ThFFF [140]. 

Poly(p-methoxystyrene)-Wocit-poly(cyclohexene oxide)... 

A detailed laser flash photolysis study of the reactions of the 4-methoxystyrene radical cation and its P-methyl and p.p-di-methyl analogs with amines and pyridines in acetonitrile and aqueous acetonitrile has been carried out. " Representative kinetic data are summarized in Table 6 and cover approximately 4 orders of magnitude in time scale. A combination of transient spectra, product studies, and redox potentials has been used to establish which of the three possible reactions contributes to the measured rate constant for any given radical cation/amine pair. For example, transient spectra obtained after quenching of the radical cations with either DABCO or aniline clearly show the formation of the amine radical cation, consistent with the fact that both of these amines have substantially lower oxidation potentials than any of the three styrenes. Reaction with primary amines occurs by addition, as evidenced by the formation of a transient in the 300-nm region that is assigned to the substituted benzyl radical. These results are consistent with the high oxi-... 

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