Dialkoxy derivatives

Now we open flask A. We can put a piece of glass and smell it once methanol is evaporated. There is no safrol smell, it s different, it s the dialkoxy derivative of safrol, rxn is completed perfectly. We add now 75 cc of water and stir 45 minutes more. There s a precipitate. We filter the reaction. I don t know what is this, may be also black tar, I thought this may be palladium complexes, this is a... 

Heating 3,4-bis(phenylsulfonyl)furoxan with a solution of sodium butoxide in butanol followed by reduction with trimethyl phosphite gives furazan 281 (Scheme 183). Compound 281 was converted into dialkoxy derivative 282 with the lithium salt of ( )-l-azabicyclo[2.2.2]octan-3-ol in 33% overall yield (96W012711, 97EUP773021, 98JMC379). 

L.S. Swanson, J. Shinar, Y.W. Ding, and T.J. Barton, Photoluminescence, electroluminescence, and optically detected magnetic resonance study of 2,5-dialkoxy derivatives of poly(p-phenylene acetylene) (PPA) and PPA-based light-emitting diodes, Synth. Met., 55 1-6, 1993. 

Some reactions of 2,2 -bipyridine /V-oxides have been reported. The l,T-dioxide is nitrated readily to 4,4 -dinitro-2,2 -bipyridine 1,T-dioxide. ° ° °" 2,2 -Bipyridine 1-oxide is also nitrated in the 4 position. The nitro groups in 4,4 -dinitro-2,2 -bipyridine l,T-dioxide are reactive, being replaced by chlorine with concentrated hydrochloric acid," by bromine with acetyl bromide, by hydroxyl with dilute sulfuric acid, and by alkoxy groups with sodium alkoxides. Some of the dialkoxy derivatives are useful catalysts for the oxidation of aromatic compounds. The dinitro dioxide is deoxygenated to 4,4 -dinitro-2,2 -bipyridine with phosphorus trichloride in chloroform, and other substituted l,T-dioxides behave similarly, but with phosphorus trichloride alone, 4,4 -dichloro-2,2 -bipyridine results. The dinitro dioxide is reduced by iron powder in acetic acid to 4,4 -diamino-2,2 -bipyridine, whereas 4,4 -dichloro-2,2 -bipyridine l,T-dioxide is converted to its 4,4 -diamino analogs with amines. Related reactions have been described. ... 

In preparing 6-alkoxy and 6,7-dialkoxy derivatives, it is convenient to react esters 12 with an acid anhydride in the presence of a Lewis acid or, preferably, perchloric acid to produce a benzopyrylium salt (14), presumably via 13 (70KGS200) (Scheme 2). Reaction of 14 with ammonia gives then the isoquinolinols 15 in high yields, where X = alkoxy, R1 = H, Me, Pr, /-Pr, and R2 = H or alkyl group (88JMC1363). 

On the basis of oxidation potentials, current-potential relationships, and isotope effects, an electron-transfer mechanism is suggested for the anodic oxidation of methyl N,N-dialkyl substituted carbamates, which can reasonably explain the formation of all three types of products. Also, N-acylazacycloalkanes are converted anodically at a platinum electrode in R0H-Et4NBF4 into a-monoalkoxy or a,a -dialkoxy derivatives depending on the electrolysis conditions employed.198... 

Reductive cleavage of the carbon-silicon bond of acyl silanes, including a-alkoxy and t/./i-dialkoxy derivatives, to give aldehydes may be accomplished by palladium-catalysed hydrogenolysis at ambient temperature and pressure212. 

Light-emitting polymers [46,48] are a more recent development and may eventually prove superior to small-molecule OLED. Typical polymers are the green poly(para-phenylene vinylene) (PPV 53), the orange-red dialkoxy derivatives (54), and the blue polyfluorene (55) [48],... 

Alkyl- and phenyl-dihydroxybOTanes, their anhydrides and dialkoxy derivatives are oxidized with alkyl hydroperoxides to the corresponding alcohols and phenols. ... 

The second approach to PPV, is the Gilch synthesis [147], which consists in the introduction of solubilizing side groups, as represented in the case of the most studied dialkoxy derivative poly[2-methoxy-5-(2 -ethylhexyloxy)-l,4-phenylene vinylene] (MEH-PPV, XII) [29,148-150] (Fig. 9.20). 

Fig. 30. Anthracene and anthraquinone derivatives are non-hydrogen-bonding gelators. In anthraquinone systems 2,3-dialkoxy derivatives such as 63 are found to be the most efficient...

Under solid-liquid phase transfer conditions both primary and secondary alcohols react with 2,4,6-trichloro-l, 2,5-triazine to give the corresponding mono or dialkoxy derivatives depending on the reagent molar ratios [94SC21S3]. 

An alternative route was developed for dialkoxy derivatives 55 whereby... 

Monoalkoxyfluorophosphoranes tend to dissociate as (6.532). On the other hand, the dialkoxy derivatives exist as phosphonium salts. The diphenoxy analogue (PhO)2Pp3 has the phosphorane structure in the solid state and the phosphonium structure in acetonitrile (6.533). 

The direct deuteration, by deuterium chloride in deuterium oxide, of the upper rim of 25,27-dialkoxy derivatives of callx[4]arenes has been shown to occur at the unsubstituted para-position of phenolic rings. ... 

The simple hydrides of the group-III metals have not been extensively studied with respect to their ability to reduce boron compounds to diborane, but Adams (2) refers to cin industrial report which records that aliominum hydride is effective. It thus converts triphenyl borate to diborane (182), and its dialkoxy derivatives of formula AlH(0R)2 are also known to reduce the boron halides to the same compound (156). 

An acetal is named as a dialkoxy derivative, and a thioacetal is named as a dialkylthio derivative. The name of 65 is l,l-di(ethylthio)butane. Just as ketones react with alcohols to form ketals, they also react with thiols to form the sulfur analog. The mechanism is identical, and the reaction is illustrated by the reaction of cyclohexanone (23) with propanethiol to give 66. This is a dithioketal named l,l-di(propylthio)cyclohexane. The key intermediate in this latter reaction is a hemithioketal. 

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