2-naphth oxide

With secondary and tertiary alkyl halides an Ea-elimination is often observed as a side-reaction. As the alkyl halide reactant an iodide is most often employed, since alkyl iodides are more reactive than the corresponding bromides or chlorides. With phenoxides as nucleophiles a C-alkylation can take place as a competing reaction. The ratio of 0-alkylation versus C-alkylation strongly depends on the solvent used. For example reaction of benzylbromide 4 with /3-naphth-oxide 5 in yV,A-dimethylformamide (DMF) as solvent yields almost exclusively the /3-naphthyl benzylether 6, while the reaction in water as solvent leads via intermediate 7 to formation of the C-benzylated product—l-benzyl-2-naphthol 8—as the major product ... 

On the other hand, the catalytic effect of water as a base is stronger at the 2-position. This result can be explained if one assumes that the proton is transferred by a water molecule which solvates the O- group in the reagent 3-sulfo-l-naphth-oxide dianion. As can be seen in 12.148, the base is already in the optimum position when the stage of the o-complex is reached. This explanation is supported by a comparison of the entropies of activation for reaction at the 2- and 4-positions. 

Chichibabin reaction, 5, 409-410 UV spectra, 5, 356 Naphthimidazoles, 2-amino-tautomerism, 5, 368 Naphth[2,3-h]imidazoles oxidation, 5, 405 Naphth[l,2-d]imidazolium salts nucleophilic substitution, 5, 412 Naphth[l, 2-h]isoquinolines... 

Naphth[2,l-d]oxazole, 2-methyl-oxidation, 6, 188 reactions, 6, 216 Naphthoxazoles, anilino-alkylation, 6, 189... 

Boiled linseed oil is a misnomer, since the oil does not boil. Small amts of driers (oxides of Mn, Pb or Co, or their naphthe-nates, resinates or linoleates) are added to hot linseed oil to accelerate drying. The boiled oil becomes thicker and darker. It is combustible, with a flash p of 403°F and an autoignition temp of 650°F (Ref 4)... 

Pyrolysis of 4-phenyl-l,2,3-benzotriazine 3-oxide (100) at 420 °C gave 3-phenylbenz-isoxazole (101), 3-phenylindazole (102) and acridin-9-one (103). However, the pyrolysis of 4-phenylnaphtho[2,3-. 

The FeCU-initiated oxidative polymerizations of both 2,2-bis[4-(l-naphth-oxy)]phenyl propane (321) and 2,2-bis[4-(l-naphthyl)phenyl] propane (382) involve two different propagation pathways [215]. If the oxidative polymerization of 2,2-bis[4-(l-naphthoxy)]phenyl propane proceeded like the other bis(l-naphthoxy) monomers (see Figs. 43 and 44) the polymer repeat unit would contain an isopropenylidene group linking two phenyl groups (Fig. 54). 

Naphtho[l,8a 8-c,d]pyrazol -1-Oxid E16a, 985 (1,8-Diamin-Oxid.), 994 (aus l-N3—8-N02 —naphth.)... 

A 1933 patent claimed the preparation of naphth[l,8-Z)c]oxete (23) along two routes a-naphthol oxidation by iron(lll) chloride, and 1,8-dihydroxynaphthalene dehydration (33BRP394,511) at 300 °C under a carbon dioxide atmosphere. 

Oxidative cyclization of quinone-derived enaminones with lead tetraacetate gives access to the isoxazoloquinones. Thus, oxidation of the enaminones 291 and 292 gives the isoxazoloquinones 293 and the naphth[2,3-c]isoxazoloquinone 294, respectively. Scheme 80 (74S30 85JHC697). 

Lamaty and collaborators have carried out solvent-free synthesis of nitrones in a ball mill [43]. Equimolar amounts of various aldehydes and A -substituted-hydrox-ylamines were used in conjunction with sodium bicarbonate (Scheme 3.64). For stoichiometric reaction between benzaldehyde and AT-methylhydroxylamine hydrochloride, small amount of dichloromethane was used. This reaction proceeded as a one-step condensation to give the corresponding nitrones in nearly quantitative yields, without the need to exclude air and moisture, in a shorter reaction time than by classical methods, but with comparable yields, where excess of reagents under inert atmosphere are reacted at room temperature or under heating for 1 or 2days (selected results. Table 3.32). Furthermore, the F,Z-isomeric ratio of the products obtained in ball-milling conditions were identical to those already reported in literature all the nitrones were in the more stable Z-form, with the exception of A -(naphth-2-ylmethylidene) methylamine A -oxide, known to be in the F-form. Microwave-assisted reactions gave lower yields than ball mill. 

Dinaphthyl Ether ttu-Dimphthyl ether, va-divaphthyl oxide, a-naphthdl o.-naphth fi ether)... 

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