4- -3-butene-2-one

SYNS 3-METHYL-3-BUTEN-2-ON (GERMAN) 2-METHYL-1-BUTEN-3-ONE METHYL ISOPROPENYL KETONE INHIBITED (DOT)... 

METHYL-1-BUTENE-3-ONE (814-78-8) Forms explosive mixture with air (flash point 68°F/20°C). Violent reaction with aldehydes, nitric acid, perchloric acid, strong oxidizers. Contact with hydrogen peroxide can form unstable peroxides heat and/or inappropriate level of inhibitor may cause polymerization. 

Buten-2-ol, 4-(2,6,6-trimethyl-2-cyclohexen-1-yl)-, acetate. See a-lonyl acetate Butenone 1-Buten-3-one 2-Butenone. See Methyl vinyl ketone... 

Mesityl oxide, benzylacetone, 2-methyl--1 -phenyl-1 -buten-3-one, furfuralacetone... 

The activity of CoSx-MoSx/NaY (2. IMo/SC) is shown in Fig.5 for the HYD of butadiene as a function of the Co/Mo atomic ratio. The HYD activity decreased slightly on the addition of Co up to Co/Mo = ca. 1, followed by a steep decrease at a further incorporation of Co. The HYD/HDS activity ratio decreased with increasing Co content and reached the ratio for CoSx/NaY at the Co/Mo atomic ratio of the maximum HDS activity (Fig.3). The product selectivity in the HYD of butadiene shifted from t-2-butene rich distribution to 1-butene rich one on the addition of Co, as presented in Fig.6. It is worthy of noting that at the Co/Mo ratio of the maximum HDS activity, the butene distribution is close to that for CoSx/NaY. It should be noted, however, that these product distributions are not the initial distributions of the HYD over the catalyst but the distributions modified by successive isomerization reactions. It was found that MoSx/NaY showed high isomerization activities of butenes even in the... 

Exercise 10-6 Addition of chlorine to frans-2-butene in ethanoic acid (acetic acid, CH3C02H) as solvent gives 74% meso-2,3-dichlorobutane, 1, 24% 2-chloro-1-methyl-propyl ethanoate, 2, and 2% 3-chloro-1-butene, 3. (Note 2 is formed as a d,l pair, although only one enantiomer is shown here.)... 

Phenyl-l-buten-3-one 2 (12 g, 0.06 mol) was refluxed with NH4SCN (6 g, 0.07 mol) in 35 ml of benzene and 2.5 g cyclohexanol for 5-6 h with water separation (Scheme A. 18). The residue was filtered off, washed with ethanol and ether and crystallized from ethanol. Yield 9 g. Melting point 198-199°C. 

Chloro-l-buten-3-one, 1450 4-Chloro-2-butynol, 1451 (Chlorocarbonyl)imidosulfur difluoride, 0317 A -(Chlorocarbonyloxy)trimethylurea, 1918... 

Concluding this chapter a very interesting variant72 of the Robinson-annela-tion73 has to be described. In a Michael-type reaction under aprotic conditions Li-1 -cyclohexene-1-olate (83) was employed to 2-TES-l-butene-3-one (84) (Scheme 10). 

Thus, most of the product with 1-butene would be expected to be the 1,2-isomer since the preferred Markovnikov adduct cannot isomerize. Also reaction of the non-Markovnikov adduct without isomerization gives 1,2-isomer. The 1,3-isomer from 1-butene is much less favored than it is with 2-butene, for with 1-butene, non-Markovnikov addition followed by isomerization before decomposition is required. This expectation is confirmed. 1-Butene gives one-sixth as much 1,3-isomer as 2-butene. Of course, 1,4-isomer is even less preferred because it requires non-Markovnikov addition followed by two isomerizations before decomposition, and only traces of 1,4-isomer is detected. 

CO. CHa, CO2, acetone, ketene. ethene. propene, 1-butene, benzene, toluene, mesitylene. xylene, methyl ethyl ketone, diethyl ketone, methyl-n-propyt ketone, methyl-n-butyl ketone, ethyl vinyl ketone, methyl propenyl ketone (trace), ethyl propyl ketone (trace), 3-methyl-cydopenlanone, cyclohexanone (trace), cyclohexa-2-enone, 2-methyl-cyclohexanone, 1-methyl-cydohexa-1-ene-3-one (trace), acrolein, mesityl oxide, ethanal, propanal. butanal. chain fragments, some monomer... 

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