9-Methyl- 2- Methylhexane

Ethyl precedes methyl in the name therefore 3-ethyl-4-methylhexane is correct... 

Heating optically active (5)-3-bromo-3-methylhexane with aqueous acetone results in the formation of racemic 3-methyl-3-hexanol. 

Methylhexane Methyl hexanoate 5-Methyl-1-hexene c/5-3-Methyl-3-hexene ... 

Methyl groups, as hydrocarbon surface species, vibrational spectra, 42 214—219 Methylheptane, ring closure, 25 154 3-Methylhexane dehydrocyclization, 30 13 isomerization, 30 7, 14, 39-40 Methylhexane, ring closure, 25 155 Methyl hydroperoxide, catalytic decomposition, 35 161... 

Note According to Chevron Phillips Company s (2005) Technical Data Sheet, 99.0-99.4 wt % / -heptane (pure grade) contains the following components c/s-l,2-dimethylcyclopentane -1- methyl-cyclohexane (< 1 wt %), /rafl5-l,2-dimethylcyclopentane (< 0.25 wt %), 3-methylhexane (< 0.25 wt %), sulfur content (< 1 wt %), and the largest other single impurity at a concentration of (<0.15 wt %). 

Isocyanic acid, 4-methyl-m-phenylene ester, see 2,4-Toluene diisocyanate Isodrin epoxide, see Endrin Isoforon, see Isophorone Isoforone, see Isophorone Isoheptane, see 2-Methylhexane... 

Methylhexane. see 3-Methylhexane l-Methylhydrazine, see Methylhydrazine Methyl hydroxide, see Methanol... 

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... 

Methylhexanoic acid, see 5-Methylhexane Methyl hydrogen phthalate, see Dimethyl phthalate Methyl hydroperoxide, see 1,1-Dimethylhydrazine Methylhydroquinone, see 2-Methylphenol... 

The reduction of the tosylhydrazone of ( + )(S)-4-methyl-3-hexanone affords ( + )(S)-3-methylhexane, optical purity 85% L. Lardicci and C. Botteghi, private communication. 

A special case of isomerization is the racemization of optically active compounds catalyzed, for example, by sulfuric acid or promoted A1C13. Thus, treatment of (+)-(5)-3-methylhexane at 60°C with 96% sulfuric acid yields a mixture of racemic 2- and 3-methylhexane68 (Scheme 4.4). At lower temperature (0 or 30°C), racemization occurs, but shift of the methyl group does not take place. It can be concluded that at 60°C methyl migration is faster than hydride abstraction to yield isomeric alkanes. At 0 or 30°C, hydride transfer occurs before methyl... 

One of the interesting points concerning the prediction of crude oil and Fischer-Tropsch compositions is the quantitative success in predicting reversal of methyl isomers. In the Ce s the concentration of 2-methylpentane is found to be greater than that of 3-methylpentane, whereas in the C7S the situation is reversed as 3-methylhexane becomes greater than 2-methylhexane. 

The isomerization of the olefin prior to its hydroformylation has been the explanation of this question (3) and the formation of isomeric aldehydes was related to the presence of isomeric free olefins during the hydroformylation. This explanation, however, is being questioned in the literature. The formation of (+) (S) -4-methylhexanal with an optical yield of more than 98% by hydroformylation of (+) (S)-3-methyl-l-pentene (2, 6) is inconsistent with the olefin isomerization explanation. Another inconsistency has been the constance of the hydroformylation product composition and the contemporary absence of isomeric olefins throughout the whole reaction in hydroformylation experiments carried out with 4-methyl-1-pentene and 1-pentene under high carbon monoxide partial pressure. The data reported in Ref. 4 on the isomeric composition of the hydroformylation products of 1-pentene under high carbon monoxide pressure at different olefin conversions have recently been checked. The ratio of n-hexanal 2-methylpentanal 2-ethylbutanal was constant throughout the reaction and equal to 82 15.5 2.5 at 100°C and 90 atm carbon monoxide. 

R)] is found for the aldehydes arising from the attack of carbon monoxide at position 3. The above stereochemical relationships are summarized in Table VI. Finally in the stereoelective hydroformylation of racemic 3-methyl-l-pentene the (R) antipode is hydroformylated at a higher rate, yielding the (R)-4-methylhexanal the ratio between the hydroformylation rate of the two antipodes is 1.1. 

Stereoelective Hydroformylation of 3-Methyl-1-pentene. The same apparatus and procedure as for styrene were used. 4.21 grams (0.05 moles) of 3-methyl-l-pentene were hydroformylated in 50 ml of dry, degassed mesitylene in the presence of 115 mg (0.125 mmole) of HRh(CO)-(P< >3)a and 249 mg (0.5 mmole) of ( — )-DIOP. After 70 hrs the conversion was 51.1%. The unreacted olefin and the aldehydes were separated with a 1-m rectification column filled with Fenske rings. The pure olefin (GLC) had [ ]d17 +1.25° (neat). The aldehydes could not be completely separated from the solvent through rectification. A fraction containing 58% of ( —) (R)-4-methylhexanal had < D25 —0.26°. 

One further point of possible confusion is where to locate the numerical symbol for the main functional group in the name. For instance, if the double bond in 1 were absent, we could name the compound either 5-methylhexan-2-ol or 5-methyl-2-hexanol. The rule is to not divide the name unnecessarily. Thus 5-methyl-2-hexanol would be correct and 5-methylhexan-2-ol would be incorrect ... 

The results for the isomerization of n-heptane are presented in Table 20.5. Over all the catalysts the main products are again the 2-methyl (M2H) and 3-methylhexanes (M3H), with a significant contribution from the dimethylpentanes of 12-13% over the platinum and Mo2C-oxygen-modified catalysts, and 21% over the Mo03-carbon-modified catalyst. 3-Ethylpentane always contributes around 3% to the isomer distribution and almost no cyclic products are observed. Increasing the pressure over the... 

Methylhexane—a six-carbon main chain with a 3-methyl substituent... 

Ethyl-3-methylhexane—a six-carbon main chain with 3-ethyl and 3-methyl substituents... 

New chiral centers are produced by addition reactions to other trigonal centers as well. Hydrogenation of 3-methyl-3-hexene gives 3-methylhexane. Clearly the addition of hydrogen to one face of the planar olefinic system gives one enantiomer and addition to the opposite face gives the opposite enantiomer. Likewise reaction of styrene with chlorine or bromine (X2) or potassium permanganate produces products with a new chiral center. Formation of the two possible enantiomers results from addition to either face of the olefin. 

The chain is numbered so as to give the lowest number to the substituent that appears closest to the end of the chain. In this case it is numbered so that the substituents are located at C-2 and C-4 rather than at C-3 and C-5. In alphabetical order the groups are ethyl and methyl they are listed in alphabetical order in the name. The compound is 4-ethyl-2-methylhexane. 

The correct numbering shows us that the branch comes from the third carbon atom in the straight chain. Therefore, the hydrocarbon name begins with the number 3. There is one carbon atom in the branch, so the branch name begins with meth- and ends in -y/—methyl. The straight chain has six carbon atoms (hex-) with only single bonds (-ane), so it is named hexane. Put it all together and we have 3-methylhexane. 

In some cases we also find liquid products of thermal decomposition of methylchloride such as 2-methyl- and 3-methylpropane, 2-methyl- and 3-methylpentane, 2-methyl- h 3-methylhexane, ethylidenechloride, etc. Their appearance signals that the temperature of the process is not regulated satisfactorily. 

The world-wide production of PA (excluding fibers) in 1997 was 1.6x10 t, with a 75 % use of casting processed materials. For food contact articles the following can be used as starting materials straight chain u -amino acids (C6-C12) and their lactams adipic acids, azelaic acids, sebacic acids, dodecane dicarboxylic acids and heptadecane-dicarboxylic acids salts with hexamethylenediamine isophthalic acid, bis(4-aminocy-clohexyl)-methane, 2,2-bis(4 -aminocyclohexyl)-propane, 3,3 -dimethyl-4,4 -diamino-dicyclohexyl-methane, terephthalic acid or its methylester, l,6-diamino-2,2,4-tri-methylhexane, 1,6-diamino-2,4,4-trimethylhexane, l-amino-3-amino-methyl-3,5,5-tri-methylhexane. 

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