Dimethyl sulfite

Reaction of carboxylate ion with nitrophenyl sulfites gives the carboxylate -nitrophenyl esters. If the -nitrophenyl sulfite is unsymmethcal (02NCgH40S(0)0R, where R is ethyl or phenyl), carboxylate attacks the -nitrophenyl side (69). Some amino acids react with methyl and benzyl sulfites in the presence of -toluenesulfonic acid to give methyl and benzyl esters of the amino acids as -toluenesulfonate salts (70). With alcohols, the conversion of henzil to a monoacetal upon addition of sulfuric acid to the henzil in methanol and dimethyl sulfite proceeds in high yield (71). 

Trimethyl Borate, (CH3)3B03, did not gel any of the NC s Trimethyl Phosphate, (CH3)3P03, gelatinized all three. NC s rapidly and completely Dimethyl Sulfate. (CH3)2S04, gelatinized li and 12% N NC s rapidly and completely, the 13% N NC incompletely Dimethyl Sulfite, (CH3)2S03, gelatinized all three NC s rapidly and completely Butyl Nitrite,... 

The oxide ignites immediately with ethanol at ambient temperature [1]. The liquid oxide (above 24°C) reacts very violently with methanol, dimethylformamide, dimethyl sulfite or dimethyl sulfoxide (also with arsenic trifluoride) and charring may occur [2],... 

Dimethyl sulfite Dimethyl sulfone Dimethyl sulfoxide 14.37... 

Traces of water are thought to cause the formation of a film on the anode in the Li/dimethyl sulfite system (25). By 1973 there were advertisements that primary Li-organic (Li/S02) cells were commercially available (26), and indeed in 1978 they are available from a number of manufacturers. Even a D-size Li-CuS cell with a mixed nonaqueous solvent is superior to the aqueous Leclanche cell of the same size, according to the authors of (27). 

In the 1,2,3-trithiole series, 1,2,3-trithiole 2-oxide (29) was obtained in 39% yield from the reaction of 2,2-dimethyl-1,3,2-dithiagermole (112) with thionyl chloride (Equation (25)) <88RTC440>. 1,3,2-Dioxathiolane 2-oxide (8) is conveniently prepared by reaction of 1,2-dihydroxyethane with either thionyl chloride <66HC(2l-l)l> or dimethyl sulfite <76CRV747> (Scheme 26). An alternative method. 

By media variables we mean the solvent, electrolyte, and electrodes employed in electrochemical generation of excited states. The roles which these play in the emissive process have not been sufficiently investigated. The combination of A vV-dimethylformamide, or acetonitrile, tetra-n-butylammonium perchlorate and platinum have been most commonly reported because they have been found empirically to function well. Despite various inadequacies of these systems, however, relatively little has been done to find and develop improved conditions under which emission could be seen and studied. Electrochemiluminescence emission has also been observed in dimethyl sulfite, propylene carbonate, 1,2-dimethoxyethane, trimethylacetonitrile, and benzonitrile.17 Recently the last of these has proven very useful for stabilizing the rubrene cation radical.65,66 Other electrolytes that have been tried are tetraethylam-monium bromide and perchlorate1 and tetra-n-butylammonium bromide and iodide.5 Emission has also been observed with gold,4 mercury,5 and transparent tin oxide electrodes,9 but few studies have yet been made1 as to the effects of electrode construction and orientation on the emission character. 

The alcoholysis of sulfites such as dimethyl sulfite offers a convenient method for the preparation of high-boiling dialkyl sulfites [33]. Earlier, Voos and Blanke [8a] reported that dimethyl sulfite is converted to diethyl sulfite in 44 % yield. The reaction was shown to be acid-catalyzed and failed when barium carbonate was present. However, a patent refers to the use of lithium hydride in the transalcoholysis of 2,2-(4,4 -dihydroxyphenyl)propane with diphenyl sulfite or di-o-cresyl sulfite [32]. Recently Mehrotra and Mathur [34] reported that the alcoholysis reaction proceeds in the absence of catalysts. Their results are summarized in Eqs. (21)—(23) and Table VII. Tertiary butanol did not... 

Troponeacetals (e.g., 409) are formed, by means of dimethyl sulfite, from tetracyclic triazoles (145) or pyrazine [67LA(705)169], whereas mercaptali-zation of thienotropones by ethane-1,2-dithiol fails [85JCS(P1)983],... 

The 4,5-unsubstituted 1,3,2-dioxathiolane system (7) exists only in the form of its 2-oxide and 2,2-dioxide or their derivatives. 1,3,2-Dioxathiolane 2-oxide (16) represents the parent compound of saturated five-membered cyclic sulfites. It is a colorless, distillable liquid which can be prepared according to the methods shown in Scheme 9. The most convenient laboratory technique is the reaction of ethylene glycol with thionyl chloride <66HC(2l-l)l>. Another possibility is the transesterification of dimethyl sulfite with ethylene glycol (76CRV747). The reaction of ethylene oxide with sulfur dioxide, frequently described in the patent literature (66HC(2l-l)i>, depends on the reaction conditions. It leads either directly... 

With Ketones, Nitromethane, Dimethyl Sulfite or Carboxylic Acid Anhydrides... 

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