2-ethenyl-2-methyl

Carboxy-methyl)-3-methyl- 4-Ethenyl-3-methyl-furazan... 

C-NMR spectroscopic studies on a-substituted tris(ethynyl)methyl cations 49 prepared from alcohols 50 (equation 18) provided evidence for the participation of resonance structures with allenyl cationic character38. The parent tris(ethenyl)methyl cation (49, R = H) cannot be generated under stable carbocation conditions (SbFs/FSOsH) presumably due to the highly reactive unsubstituted termini of the three ethynyl groups and the resulting low kinetic stability. The chemical shift data (Table 1) give evidence that in all cases Ca and CY are deshielded more than Cg (relative to their precursor alcohols). 

A 69.5 g portion of l-ethoxy-2-(4-pyridinyl)ethenyl methyl ketone was dissolved in 300 ml of ethanol and to the solution was added 13.2 g of malononitrile. The resulting mixture was refluxed for 5 hours, crystals starting to separate after about 30 min of refluxing. The reaction mixture was allowed to cool to room temperature and, the precipitate of fine needles was filtered, washed with ethanol and dried in a vacuum at 90°C to yield 25.4 g of 1,2-dihydro-6-methyl-2-oxo-5-(4-pyridinyl)-nicotinonitrile, m.p. >300°C. Concentration of the mother liquor provided another 2.1 g of product, m.p. >300°C. 

Chlorocarbonylphenyl)-ethenyl methyl tellurium cyclizes electrophilically in the presence of aluminum trichloride to yield isotellurocoumarin3. 

Oxo-l//-2-henzotellurin (Isotellurocoumarin)3 2.9 g (10 mmol) of 2-(2 -chlorocarbonylphenyl)-ethenyl methyl tellurium and 100 mg of anhydrous zinc chloride are dissolved in 10 ml of dichloromethyl methyl ether and the mixture is kept overnight at 20°. The ether is evaporated and 50 ml of dry dichloromethane are added to the residue (the carboxylic acid chloride). This solution is cooled to — 80° and 1.33 g (10 mmol) of aluminum chloride are added with efficient stirring. The mixture is allowed to warm to 20°, it is then poured into 100 ml of ice/water. the mixture is extracted with chloroform, the extract is dried, and evaporated. The residue is recrystallized from hexane yield 0.77 g (30%) m.p. 83°. 

Arsan Chior-(2-chlor-ethenyl)-methyl- XIII/8, 244... 

Silan Chlor-dimethylamino-ethenyl-methyl- XIII/5, 229... 

Sulfoxid [2-(2,4-Dichlor-phenyl)-ethenyl]-methyl- Ell, 779 (Wittig-Horner-Reaktion)... 

Ethoxy-2-phenyl-ethenyl)-methyl-Ell, 766 (a-Alkylier.) Thiokohlensaure... 

Keten Ethenyl-methyl- -(4-methyl-phenylimin) EI5/3, 2557 (R2CH-CO-NH-R +... 

Sulfonium(IV) Dimethylamino-(2-ethoxy-2-phenyl-ethenyl)-methyl-oxo- (tetrafluoroborat) Ell, 954 (N-Alkylier.)... 

Ethenyl-methyl-diazirin wird thermisch zu 3(5)-Methyl-IH-pyrazol isomerisiert [s.Bd. X/4 S. 922 (1968)]. 

Agrisynth MVE EINECS 203-475-4 Ethene, methoxy- Ether, ethenyl methyl Ether, methyl vinyl HSDB 1033 Methoxyethene 1-Methoxyethylehe Methyl vinyl ether UN1087 Vinyl methyl ether. Gas mp = -122 bp = 5.5" d = 0.7725 slightly soluble in H2O, very soluble in EtOH, Et20, Me2CO, CeHe. 

The procedure involves reaction in acetic anhydride, or in another solvent, followed by the addition of acetic anhydride to decompose the intermediate complex. The procedure has been extensively examined in relation to the 5-methyl- and 4,5-dimethyl-substituted compounds derived from ethenyl methyl and methyl isopropenyl ketones and with mesityl oxide which gives the 3,3,5-trimethyl-substituted compounds. Amongest the phosphorus reactants, the trichloride itself and methyl- " , ethyl- " " and phenyl- phosphonous dichlorides have been employed, as have ethyl and phenyP dichlorophosphites, ROPCI2. The use of 2-thienylphosphonous dichloride to give 137 is recorded as is that of the unsaturated ketone 138 to give 139. A more novel conversion is that of 140 into 141 in 25% yield with a similar conversion (15%) being observed for cholest-4-en-3-one. ... 

C-H vinyl C-H attached to >C=0 group, such as (CH2=CH-C=0 -) C-H, vinyl on O (1-ethenyloxybutane) as (CH2=CH-C=0 -) Vinyl as 1-ethenyl oxybutane (1-ethenyl-methyl-ethyl-ketone) S Q ... 

Vinyl as 1-ethenyl oxybutane (1-ethenyl-methyl-ethyl-ketone)... 

Nifurprinol. 6-[2-(5-Nitro-2-furanyl)ethenyl]-2-pyridine methanol, is prepared from 5-nitro-2-furancarboxaldehyde and 6-methyl-2-pyridine methanol (48). The product has been used as an antibacterial in fish diseases. 

The additional coupling (9.8 Hz) of the cyclopropane proton A at <5// = 1.60 is the result of a vicinal H atom in the side-chain. This contains a methyl group B, a vinyl group C and an additional substituted ethenyl group D, as may be seen from the one dimensional H and C NMR spectra and from the CH COSY diagram. 

Methyl-6-aminobenzoselenazole when treated with 3-penten-2-one gave by a simple Doebner-Miller type reaction the 2,7,8-trimethylselenazoloquinoline 43 in 18.6% yield, that is the angular product and not the linearly annelated one was formed. Its structure was confirmed by the coupling constant in proton NMR (71JHC693). Selenazoloquinoline 43 can be converted via the 6-methylpyridium salt in the reaction with 4-dimethylaminobenzaldehyde to 2,6-dimethyl-7,9-bis(l-(4-dimethylaminophenyl)-2-ethenyl)selenazolo[5,4-/]quinolinium iodide 44 (Ar = 4-dimethylaminophenyl). This dye exhibited two absorption maxima between 500 and 600 nm (72MI2). 

Vilsmeier-Haack formylation of 2-(4-methyl-l-piperazinyl)-4//-pyrido-[l,2-n]pyrimidin-4-one with a mixture of POCI3 and DMF at 95°C gave a 3-formyl derivative (93FES1225) while ethyl 4-oxo-6,7,8, 9-tetrahydro-4//-pyrido[l,2-n]pyrimidine-2-acetate at 50 °C yielded a 9-dimethylaminomethylene-3-formyl derivative (01MI4). 3-Formyl-2-hydroxy-8-[2-(4-isopropyl-l,3-thiazol-2-yl)-l-ethenyl]-4//-pyrido[l,2-n]pyri-midin-4-one was obtained from the 3-unsubstituted derivative with oxalyl chloride-DMF reagent in CH2CI2 at room temperature for 3h (OlMIPl). 

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