2.3- dimethyl-butane

N-VALERIC ACID ISOBUTYL FORMATE N-PROPYL ACETATE ETHYL PROPIONATE METHYL BUTYRATE METHYL ISOBUTYRATE PIPERIDINE N-PENTANE 2-METHYL BUTANE 2 2-DIMETHYL PROPANE... 

Butane, 2,2-dimethyl- 0 7.8 1.2 7 FALSE FALSE FALSE FALSE... 

DIOP 2,3-0-isopropylidene-2,3-dihydroxy-1,4-bis(diphenylphosphino)butane = [(2,2-dimethyl-1,3-dioxolane-4,5diyl)bis (methylene)]bis[diphenylphosphine]... 

Impurity ex propylene oxide Iso-butane 2,2-dimethyl butane Propylene oxide... 

Dymethyl butane Dimethyl carbonate Dimethyl chloracetal Dimethyl ether, see Methyl ether Dimethylformamide... 

Phosphonshiire l-Diazo-3-methyl-2-pyrrolidino-butan- -dimethyl-ester E19d, 648 (En-amin 4-R-CHN2)... 

In 2,3-dimethylbutane, the longest carbon chain is four, indicating a butane dimethyl indicates two methyl groups 2,3- means that one CH3 is on C-2 and one is on C-3. In 2,2-dimethylbutane, both methyl groups are on the same carbon atom both numbers are required. 

Holldorff, H. Knapp, H. Vapor pressures of n-butane, dimethyl ether, methyl chloride, methanol and the vapor-Uquid equilibrium of dimethyl ether - methanol experimental apparatus, results and data reduction Fluid Phase Equilib. 1988,40, 113-125... 

Fig. 4.24 Heat of immersion of a carbon (prepared by pyrolysis of Saran Polymer A) in different liquids at 300 K. The liquids for points 1-6 were (I) methanol (2) benzene (3) n-hexane (4) 3-methyl benzene (5) 2,2-dimethyl butane (6) 2,2,4-trimethyl pentane. The abscissae represent the molar volumes of the liquids. (Redrawn from the original diagram of Barton, Beswick and Harrison. " )...

Thermoplastic copolyester elastomers are generally block copolymers produced from short-chain aUphatic diols, aromatic diacids, and polyalkjlene ether-diols. They are often called polyesterether or polyester elastomers. The most significant commercial product is the copolymer from butane-l,4-diol, dimethyl terephthalate, and polytetramethylene ether glycol [25190-06-1J, which produces a segmented block copolyesterether with the following stmcture. 

In this manner, the four isomers of hexane are named 2-methyl pentane, 3-methyl pentane, 2,2,-dimethyl butane, and 2,3-dimethyl butane. 

H2Sil2, CDCI3, —42°, 1-10 min, 100% yield. Aromatic ketals are cleaved faster than the corresponding aliphatic derivatives, and cyclic ketals are cleaved more slowly than the acyclic analogues, such as dimethyl ketals. Substituted ketals such as those derived from butane-2,3-diol, which react only slowly with Mc3SiI, can also be cleaved with H2Sil2. If the reaction is run at 22°, ketals and acetals are reduced to iodides in excellent yield. 

Constitutional isomerism is not limited to alkanes—it occurs widely throughout organic chemistry. Constitutional isomers may have different carbon skeletons (as in isobutane and butane), different functional groups (as in ethanol and dimethyl ether), or different locations of a functional group along the chain (as in isopropylamine and propylamine). Regardless of the reason for the isomerism, constitutional isomers are always different compounds with different properties, but with the same formula. 

Unlike the constitutional isomers butane and isobutane (Section 3.2), which have their atoms connected in a different order, the two 1,2-dimethyl-cyclopropanes have the same order of connections but differ in the spatial orientation of the atoms. Such compounds, which have their atoms connected in the same order but differ in three-dimensional orientation, are called stereochemical isomers, or stereoisomers. 

Dimethyl-2,2,4,4-tetranitropentane 2,3-Dimethyl-3,4-dinitro-2,3-bis (nttromethyl) butane 2,5-Dimethyl-2,33,4,4,5-hexanitro-hexane 3,4-Dimethyl-2,2,3,4,5,5-hexanitro-hexane and 2,2,4,4-Tetrakis (nitromethyl) pentane. Ref 2 details a listing of a variety of methods attempted in these unsuccessful syntheses... 

Predict which substance in each of the following pairs has the greater viscosity in its liquid form at 0°C (a) ethanol, CH3CH2OH, or dimethyl ether, CH3OCH3 (b) butane, C4H10, or propanone, CH3COCH3. 

Diboran kann besonders dann zur Reduktion von Nitrilen mit Erfolg eingesetzt werden, wenn Lithiumalanat und auch Lithiumalanat/Aluminiumchlorid nicht die gewunschten Resultate zeigen. Aus tert.-Butyl-malonsaure-dinitril erhalt man z.B. nur durch Reduktion mit Diboran l-Amino-3,3-dimethyl-2-aminomethyl-butan (36—48% d. Th.)2. 

Triathyl-siliciumhydrid reduziert Halogen-alkane bei Aluminiumchlorid-Katalyse nach einem polaren Mechanismus zu Kohlenwasserstoffen. So erhalt man z. B. aus 1-Chlor-hexan 57% d.Th. Hexan, aus l-Chlor-2,2-dimethyl-propan unter Umlagerung 36% d.Th. 2-Methyl-butan bzw. aus 4-Chlor-2,2-dimethyl-butan 50% d.Th. 2,3-Dime-thyl-butans. 

N-[2,3-Dimethyl-butyl-(2)J-hydroxylaminium-oxalat8 5,98 g (0,04 Mol) 3-Chlor-2-nitroso-2,3-dimethyl-butan in 150 m/ abs. Diathylather werden unter Stickstoff mit einer Losung von 1,52 g (0,04 Mol) Lithiumalanat in 40 ml abs. Diathylather 4 Stdn. am RiickfluB erhitzt. Man kiihlt die Mischung ab, zersetzt mit Wasser, filtriert den Niederschlag, wiischt mit Diathylather, trocknet das Filtrat mit Natriumsulfat und gibt eine ather. Losung von wasserfreicr Oxalsaure zu. Das isolierte Oxalat wird aus Alkohol/Diathyliither umkristallisiert Ausbeute 3,6 g (5511/, d.Th.) F 156° (Zers.). 

Aus Acrylnitril wird auf analoge Weise mit 1 -Brom-butan bzw. tert.-Butylbromid Hep-tansaure-nitril (84% S.A.) bzw. 4,4-Dimethyl-pentansdure-nitril (100% S.A.) erhalten2. 

Aus Stilben wird mit tert.-Butylchlorid bei -2,3 V ein 3 2-Gemisch aus 3,3-Dimethyl-1,2-diphenyl-butan und 2-Phenyl-1-(4-tert.-butyl-phenyl)-dthan5 erhalten. 

R1 = R2 = CH3 2,3-Pyrrolidino-2,3-dimethyl-butan R1 = H R2 = C6Hs 2,3-Pyrrolidino-2,3-diphenyl-butan... 

Dibrom-pentan kann bei -2,2 V in DMSO/Tetraathylammoniumbromid (Vorelek-trolyse ) in hoher Ausbeute zu 1,2-Dimethyl-cyclopropan reduziert werden (die Stereo-isomeren entstehen zu gleichen Teilen)1. In Methanol gelingt die quantitative Herstel-lung von 2-Hydroxy-2-methoxy-1,1 -dimethyl- bzw. 3-Hydroxy-3-methoxy-tetramethyl-cyclopropan aus l,3-Dibrom-2-oxo-3-methyl-butan bzw. 2,4-Dibrom-3-oxo-2,4-dime-thyl-pentan2. 

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