Methyl propanal 2-methylpropanal

Bassam Z. Shakhashiri, "Hydrolysis of 2-chloro-2-methylpropane," Chemical Demonstrations, A Handbook for Teachers of Chemistry, Vol. 4 (The University of Wisconsin Press, Madison, 1992), pp. 56-64. The time required for the color change in this reaction is shown to increase with increasing sodium hydroxide concentration, decrease with increasing 2-chloro-2-methylpropane concentration, and increase as the ratio of water/acetone increases. These observations are related to the mechanism of 2-chloro-2-methyl-propane hydrolysis. 

Alkaline medium, however, is not always suitable since branched-chain alkyl halides are subject to elimination, and there are striking changes in orientation of substitution with unsymmetrically substituted imidazoles. Only low yields of l-(l-imidazolyl)-2-methyl-propane are obtained in the reaction of imidazole with l-iodo-2-methylpropane in sodium-liquid ammonia. 

C4H7F3 1,1,2-trifluoro-2-methyl propane 218.21 4.419 2 3408 C4H8I2 1,2-diiodo-2-methylpropane 66794-23-8 252.88 7.514 2... 

C4H8Br2 1,3-dibromo-2-methylpropane 28148-04-1 238.94 13.163 2 3700 C4H9N02 2-n itro-2-methyl propane 594-70-7 299.38 9.057 2... 

Look carefully at the reactions shown in the previous section. In each case, in unsymmetrically substituted alkene has given a single addition product, rather than the mixture that might have been expected- For example, 2-methylpropene might have reacted with HCI to give l-chloro-2-methyl-propane (isobutyl chloride) in addition to 2-chloro-2-methylpropane, but it didn t. We say that such reactions are regiospecific (ree-jee-oh-specific) when only one of two possible orientations of addition occurs. 

The linear molecule (1) is called butane, or normal butane ( -butane), whereas the branched molecule (2) is methylpropane (rather than 2-methyl-propane, as the methyl group has to be in a 2-position). If the methyl group of (2) were attached to a terminal carbon, the resultant molecule would be the same as (1). Methylpropane (2) is also called /robutane. 

Beilstein Handbook Reference) Benzene, (2-methylpropyl)- Benzene, isobutyl- BRN 1852218 EINECS 208-706-2 Isobutylbenzene (2-Methylpropyl)benzene 2-Methyl-1-phenylpropane NSC 24848 1-Phenyl-2-methylpropane 2-Phenyl-2-methyl-propane. Liquid mp = -51.4° bp = 172.7 d =0.8532 Xm = 259, 261, 264,268 nm (e = 221, 216,170,174, MeOH) insoluble in H2O, freely soluble in EtOH, EtzO, MezCO, CsHe, CCU, petroleum ether. 

Dr. Don T. Doit wanted to synthesize the anesthetic 2-ethoxy-2-methylpropane. He used ethoxide ion and 2-chloro-2-methyl-propane for his synthesis and ended up with very little ether. What was the predominant product of his synthesis What reagents should he have used ... 

Acetone, bromoethane, butane, chloroethane, 2-chloropropane, 1,3-cyclopenta-diene, dibromodifluoromethane, 1,1-dichloroethane, 1,1-dichloroethene, 1,2-di-chloro-l,l,2,2-tetra luoroethane, diethylether, dimethoxymethane, dimethylpro-pane, 1,3-epoxypropane, ethyl formate, glyoxal, methyl acetate, methylbutane, methyl formate, methylpropane, -pentane, propanal. 

CH3.CH(CH3) CH3 2-methyl propane (isobutane) Primary CH3-CH(CH3) CH20H 2-methylpropan-l-ol (isobutyl alcohol or isobutanol)... 

Refer to Figure 3-2 (page 71) and you will notice that butane and methyl-propane have the same molecular formula, C4H10, but different structural formulas. Butane is based on a four-carbon chain, whereas in methylpropane, a... 

Building on propane, we can replace a hydrogen atom on a terminal carbon with a methyl group to form butane, an alkane with four carbon atoms in a row. Alternatively, we can replace either hydrogen atom on the inner carbon of propane to give a different compound, 2-methylpropane. In this molecule, three carbon atoms are in a row, but the fourth carbon atom is off to one side. 

Several of the lower molecular weight aliphatic compounds, in a mixture, are part of the roasted coffee aroma. A nine-compound mixture with roasted coffee aroma contained isopentane, n-hexane, acetaldehyde, dimethyl sulfide, propanal, isobutanal, isopentanal, methanol, and 2-methylfuran.20 In addition, the freshness of aroma and taste has been correlated with 2-methylpropanal and diacetyl. When the concentration of these falls off, so does the taste.21 Other aliphatic compounds that are steadily lost from ground roasted coffee, unless it is vacuum packaged, include methyl formate, methyl acetate, methyl thioacetate, and acetone.22 The concentrations in roast coffee for four compounds whose contribution to the fresh flavor have long been known are dimethyl sulfide (4 ppm), methyl formate (12 ppm), isobutanal (20 ppm), and diacetyl (40 ppm). The taste thresholds are 0.1, 0.5, 0.5, and 1.0 ppm, respectively, in the brew made with 5 g coffee per 100 ml water.15... 

UN 1897, see Tetrachloroethylene UN 1915, see Cyclohexanone UN 1916, see Bis(2-chloroethoxy)methane. Bis(2-chloroethyl) ether UN 1917, see Ethyl acrylate UN 1918, see Isopropylbenzene UN 1919, see Methyl acrylate UN 1920, see Nonane UN 1941, see Dibromodiflnoromethane UN 1969, see 2-Methylpropane UN 1978, see Propane UN 1991, see Chloroprene UN 1992, see 2-Chloroethyl vinyl ether UN 1993, see 2,3-Dimethylpentane, 3,3-Dimethylpentane, 4 Ethylmorpholine, 2-Ethylthiophene, Indan, Isobutylbenzene, 2-Methylhexane, 3-Methylhexane, 2-Methyl 1 pentene, 4-Methyl-l-pentene, 1,4-Pentadiene, cis 2 Pentene, frans-2-Pentene, 1,2,4-Trimethylbenzene UN 2018, see 4-Chloroaniline UN 2019, see 4-Chloroaniline... 

More than 300 compounds had been identified in cocoa volatiles, 10% of which were carbonyl compounds (59,60). Acetaldehyde, 2-methylpropanal, 3-methylbutanal, 2-methylbutanal, phenylacetaldhyde and propanal were products of Strecker degradation of alanine, valine, leucine, isoleucine, phenyl-acetaldehyde, and a-aminobutyric acid, respectively. Eckey (61) reported that raw cocoa beans contain about 50-55% fats, which consisted of palmitic (26.2%), stearic (34.4%), oleic (37.3%), and linoleic (2.1%) acids. During roasting cocoa beans these acids were oxidized and the following carbonyl compounds might be produced - oleic 2-propenal, butanal, valeraldehyde, hexanal, heptanal, octanal, nonanal, decanal, and 2-alkenals of Cg to C-q. Linoleic ethanal, propanal, pentanal, hexanal, 2-alkenals of to C q, 2,4-alkadienals of Cg to C-q, methyl ethyl ketone and hexen-1,6-dial. Carbonyl compounds play a major role in the formation of cocoa flavor components. 

Methyl glyoxal has never been reported in soy sauce or soy bean paste prior to this study. Certain aldehydes (acetaldehyde, n-propanal, 2-methylpropanal, and 3-methylbutanal) were found in soy sauce previously (32). A gas chromatogram of the extract from cysteamine-treated soy sauce and untreated soy sauce are shown in Figures 7 and 8. 

SYNS FEMA No. 2220 ISOBUTANAL ISOBUTYI ALDEHYDE ISOBUTYL ALDEHYDE (DOT ISOBUTYRALDEHYD (CZECH) ISOBUTYRIC ALDEHYDE 2-METHYLPROPANAL 2-METHYL-l-PROPANAL 2-METHYLPROPIONALDEHYDE NCI-C60968 VALINE ALDEHDYE... 

SYNS 2-METHOXY-2-METHYLPROPANE METHYL 1,1-DIMETHYLETHYL ETHER METHYL tert-BUTYL ETHER (DOT) MTBE PROPANE, 2-METHOXY-2-METHYL- (9CI)... 

R)-3-(tert-Butyldiphenylsilyloxy)-2-methylpropanal Propanal, 3-[[(1,1-dimethylethyl)diphenylsilyl]oxy]-2-methyl-, (2R)- (12) (112897-04-8)... 

So the name of this butane isomer is 2-methylpropane (propane with a methyl group joined to the second carbon atom of the chain instead of a hydrogen atom). Notice that the name has a dash between the number and the following letter. 

---