3,5-Diphenyl-4-methyl- -1,1-dioxid

Ethylene, /3-(dimethylamino)-nitro-in pyrrole synthesis, 4, 334 Ethylene, dithienyl-in photochromic processes, 1, 387 Ethylene, furyl-2-nitro-dipole moments, 4, 555 Ethylene, l-(3-indolyl)-2-(pyridyl)-photocyclization, 4, 285 Ethylene, l-(2-methyl-3-indolyl)-l,2-diphenyl-synthesis, 4, 232 Ethylene, (phenylthio)-photocyclization thiophenes from, 4, 880 Ethylene carbonate C NMR, 6, 754 microwave spectroscopy, 6, 751 photochemical chlorination, 6, 769 synthesis, 6, 780 Ethylene oxide as pharmaceutical, 1, 157 thiophene synthesis from, 4, 899 Ethylene sulfate — see 2,2-dioxide under 1,3,2-Dioxathiolane... 

Diphenyl- -1,1-dioxid 464 Hexyl- 448, 570 Methoxymethyl- 448 Methyl- (subst.) 532... 

Ito and Matsuda studied the y-radiolysis of 2-methyltetrahydrofuran (MTHF) solutions of diphenyl sulfone and dibenzothiophene-S,S-dioxide (DBTSD) at 77 K. They found that the radical anions of these sulfone compounds are formed and have intense absorption bands at 1030 nm and 850 nm, respectively. The blue glassy solution of y-irradiated diphenyl sulfone has absorption bands at both 1030 nm and 360 nm while the absorption spectrum of the benzenesulfonyl radical formed by UV irradiation of diphenyl sulfone solution at 77 K showed only a peak at 382 nm. Gamma-irradiated phenyl methyl sulfone solution showed an absorption band only at 385 nm. Consequently the appearance of the absorption bands in 800-1030 nm of diphenyl sulfone and DBTSD may suggest that the unpaired electron is delocalized on two phenyl rings. The same authors studied the radiolysis of MTHF solutions of disulfones (diphenyl and dihexyl disulfones). They found a blue coloring of the solution by the y-radiolysis of diphenyl disulfone and dihexyl disulfone due to absorption peaks at 695 nm and 690 nm respectively, besides smaller absorptions at 300-400 nm. Comparing these results to the previous observation, that phenyl methyl sulfone solution absorbs only at 398 nm, results in the conclusion that the absorption band at 690 nm is due to the linked two sulfone moieties. The authors found that substituents on the phenyl ring lead to shifts in the absorption maxima of the... 

Other chemical reagents that have been used to dehydrogenate are diphenyl disulfide for 1,2,3,4-tetrahydrocarbazole itself, N-bromosuccinimide in pyridine for 1-ethoxycarbonyl-1,2,3,4-tetrahydrocarbazole, selenium dioxide for 9-methyl-1,2,3,4-tetrahydrocarbazole (a 1 5 mixture of 9-methyl-carbazole and 1-oxo-1,2,3,4-tetrahydrocarbazole was obtained ), and manganese dioxide to aromatize 1-methyl- and l,4-dimethyl-6-alkoxy-3-formyl-1,2,3,4-tetrahydrocarbazoles and 1,9-diprenyl-1,4-dihydrocarba-zole. ... 

Eine cyclisierende Hydroaminierung besonderer Art erfolgt bei der Reaktion von Bis-[2-phenyl-ethenyl]-sulfon mit N-Methyl-hydroxylamin. Es bildet sich 3,5-Diphenyl-4-me-thyl-tetrakydro-1,4-thiazin-1,1-dioxid (34%), moglicherweise fiber ein intermediates N-Oxid4. 

Treatment of the hydronitrates in aqueous solution with sodium carbonate causes evolution of carbon dioxide. Evaporation to dryness, followed by extraction with alcohol or benzene, then yields oils which are probably the selenoxides. These oils with concentrated hydrochloric acid are converted into white solids, crystallisable from benzene, xylene, alcohol or dry ether. These solids are the dichlorides of the original selenides, and when prepared by this method their melting-points are as follows Phenyl methyl selenium dichloride, M.pt. 122° C. phenyl ethyl selenium dichloride, M.pt. 64° to 65° C. diphenyl selenium dichloride, M.pt. 142° C. 

Isothiazole-3-thione, 2-methyl- H NMR, 5, 15 (80CPB487) 6, 137 (80CPB487) Isothiazolidine 1,1-dioxide, 2-(3-nitrophenyl)-15N NMR, 6, 140 (78JOC4693) Isothiazole-5-thione, 2,4-diphenyl-i5N NMR, 6, 140 (78JST(48)227)... 

The availability of o-benzoylbenzenesulfonyl chlorides, prepared by diazotization of o-aminobenzophenones followed by reaction with sulfur dioxide in the presence of cuprous ions, can be exploited in the reaction with hydrazine or methylhydrazine to give 1,2,3-benzothiadiazine 14. Product 14 (R1 = Me) can also be obtained by methylationof 14(R = H) with methyl iodide and sodium hydroxide. The reduced form 15 results from catalytic hydrogenation of 14 (R = H, R2 = H)(68JHC453). Hydra-zobenzene reacts with 2-chlorosulfonylbenzoyl chloride in the presence of triethylamine to give diphenyl derivative 16 (79MI1). 3,1,2-Benzothia-... 

However, the reactivity of TJ toward insertion of small molecules into the Pd-Pd bond is much lower. Complex 1J does not insert carbon monoxide, sulfur dioxide or methyl isocyanide into the Pd-Pd bond. However, the pyridine nitrogen appears readily displaced. Thus 1J reacts with excess methyl isocyanide to form Pd2(CNCH3)i,(PPh2py)22+ and with carbon monoxide to form Pd2(C0)2-Cl2(PPh2py)2 (v(C0) at 2019 and 1994 cm-1)- These two products appear to contain monodentate, phosphorus-coordinated 2-diphenyl-phosphinopyridine and an intact Pd-Pd bond. 

The N-sulfonylurethane (2) readily undergoes [2 t- 2] cycloadditions with olefins. Thus generation of (2) in acetonitrile in the presence of 1,1-diphenylethylcne gives 2-carbomethoxy-3,3-diphenyl-l,2-thiazetidine 1,1-dioxide (3) and N-carbomethoxy-)S,)3-diphenylvinylsulfonamide (4). Methyl N-sulfonylurethane (2) reacts with some... 

Dimethylquinoxaline 1.4-dioxide (1) condenses with diketones to yield a mixture of mono- and di-A-oxides, e.g. diphenyl diketone (2) gives mono- 3 and di-A-oxidcs 4 in 6 and 14% yield, respectively. Since the A-oxide functions of quinoxaline di-A -oxides may be regarded as the combination of two nitrone groups, methyl protons at positions C2 and C3 show enhanced acidity. 

The dipole moment of thietane 1,1-dioxide in benzene solution is 4.49 The dipole moment of 3.33 D for 3-chlorothietane 1,1-dioxide is in better agreement with a planar than a nonplanar ring conformation, The dipole moments of 3-hydroxy-3-methyl-(jU = 4.73 D, dioxane, axial OH), 3,3-dimethyl (jli = 4.56D, CCI4), 3-phenoxy-( u = 4.13 D, CCU), and 2,3-dichloro-4,4-diphenyl (cis, 2a, 3e, /.i = 4.51 D, CeHg trans 2e, 3e, = 3.32 D, thietane 1,1-dioxides have been... 

Isomerization of cis adducts of sulfenes with eneamines to trans adducts has been accomplished by treatment with n-butyllithium sodium methoxide or ethoxide, potassium t-butoxide, and triethylamine. " 7>-fl s-2,4-diphenyl-thietane 1,1-dioxide is converted to the cis isomer by treatment with sodium methoxide and equilibration of 2-methyl-4-phenylthietane 1,1-dioxide with bases gives mixtures containing 68-72% of the cis isomer. The results may be interpreted on the basis of a puckered ring and a preference for substituents to adopt a pseudoequatorial conformation. 

Thermolysis of 1,2-thiazetidine 1,1-dioxide at 400°C and 2 mm pressure is said to give ethenesulfonamide. Thermolysis of either cis- or /rans-2-methyl-3,4-diphenyl-l,2-thiazetidine 1,1-dioxide at 220°C yields traws-stilbene and benzaldehyde in relatively low yields. The parent ion minus SO2H is the base peak in the mass spectrum of the above methyldiphenyl derivative, and there are also ions corresponding to PhC=N CH3 and the parent ion minus sulfur dioxide. ... 

Several j3-sultones are claimed to be formed by treatment of alkenes with sulfuric acid or by heating alkenesulfonic acids. Treatment of 2,2-dimethyl-1,1-diphenyl-1-propanol with concentrated sulfuric acid at room temperature is said to give 3-(l,l-diphenylethyl)-3-methyl-l,2-oxathietane 2,2-dioxide (96% yield). Treatment of sodium 3-bromo-2-hydroxybutanesulfonate with phosphorus trichloride is reported to give a low yield of 4-(l-bromoethyl)-l,2-oxathietane 2,2-dioxide.1,2-Oxathietane 2,2-dioxide is suggested as an intermediate in the reaction of /3-hydroxyethanesulfonyl chloride with trimethylamine to give the zwitterion 502. The first four-membered monocycUc sulfurane oxides 502a have been reported. 

Quaternization of the four dimethylpyrazine A(-oxides and 2,3-diphenylpyrazine 1-oxide with methyl iodide in a sealed tube at 80 gave the 4-methylpyrazinium 1-oxide iodides, but 3-phenyl-, 2,5-diphenyl- and 3,5-diphenylpyrazine 1 -oxides and dimethylpyrazine 1,4-dioxides could not be quaternized. The quaternary salts were reduced by sodium borohydride to A -hydroxypiperazines (766). 

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