2,4-Dinitrophenyl methyl ether

Thin-layer chromatographic methods have been developed for identification of the dinitrophenyl derivatives of the sphingosines and their methyl ethers.34,35... 

Dinitrophenyl 2y-iodo-3y-methyl-4y-nitro-6y-isopropylphenyl ether [69311-70-2]... 

Electron Transport Between Photosystem I and Photosystem II Inhibitors. The interaction between PSI and PSII reaction centers (Fig. 1) depends on the thermodynamically favored transfer of electrons from low redox potential carriers to carriers of higher redox potential. This process serves to communicate reducing equivalents between the two photosystem complexes. Photosynthetic and respiratory membranes of both eukaryotes and prokaryotes contain stmctures that serve to oxidize low potential quinols while reducing high potential metaHoproteins (40). In plant thylakoid membranes, this complex is usually referred to as the cytochrome b /f complex, or plastoquinolplastocyanin oxidoreductase, which oxidizes plastoquinol reduced in PSII and reduces plastocyanin oxidized in PSI (25,41). Some diphenyl ethers, eg, 2,4-dinitrophenyl 2 -iodo-3 -methyl-4 -nitro-6 -isopropylphenyl ether [69311-70-2] (DNP-INT), and the quinone analogues,... 

Stability of the compounds 86 varies dramatically with the nitrogen substituent. Methyl" and phenyl s derivatives (86 R = Me or Ph) are moderately stable crystalline solids—often hydrated (87 or 88 X = OH). The 2,4-dinitrophenyl derivative [86 R = C6H3(NO2)2, R = H] is less stable but can be isolated as orange prisms (mp 112°C)5° It readily rearranges to the diaryl ether 96 (mp 128°C) with which it was originally confused.5The monomeric 5-nitro-2-pyridyI derivative is similarly unstable and in solution dimerizes giving adduct 97a. 5 5 The 4,6-di-methylpyrimidin-2-yl derivative can only be isolated as the dimers 97b and... 

Vercellotti et al. (65) studied the rates of / -elimination for O-benzyl ethers of O-glycosyl-N-(2,4-dinitrophenyl)-L-serine and L-threonine methyl esters in non-aqueous solvents using various bases. The corresponding acetyl derivatives of 2-acetamido-2-deoxy-D-galactose were also included. Generally, these substances were highly reactive, but the nature of the solvent and the base type were influencing factors. Thus, no elimination occurred in benzene when trimethylamine was used as base. 

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