Tert-butyl isopropyl ether

Fractionation of Glucose and tert-Butyl Isopropyl Ether Solute by Cellulose Acetate Membranes. The fractionation of glucose and tert-... 

A solution of 1.7 g of 2-hydroxymethyl-3-benzyloxy-(1-hydroxy-2-tert-butyl-aminoethyl)py-ridine in 30 ml of methanol containing 1.2 ml of water is shaken with 700 mg of 5% palladium-onatmospheric pressure. In 17 minutes the theoretical amount of hydrogen has been consumed and the catalyst is filtered. Concentration of the filtrate under reduced pressure provides 1.4 g of the crude product as an oil. Ethanol (5 ml) Is added to the residual oil followed by 6 ml of 1.75N ethanolic hydrogen chloride solution and, finally, by 5 ml of Isopropyl ether. The precipitated product is filtered and washed with isopropyl ether containing 20% ethanol, 1.35 g, melting point 182 (dec.). 

Oxygen was added as oxygenated hydrocarbon components methyl tert-butyl ether (MTBE), tert-amyl methyl ether (TAME), ethyl tert-butyl ether (ETBE), di-isopropyl ether (DIPE), ethanol, methanol, and tertiary butyl alcohol (TBA). The properties of oxygenates, as they relate to gasoline blending, are shown in Table 10-1. 

The photodecomposition of isopropyl alcohol on silica gel produces a seven-line spectrum having a hyperfine separation of 20.7 G and an amplitude ratio of 1 6.7 20.2 31 21.1 7.4 1.5 (68). This spectrum was attributed to SiOCMe2 formed from the ether surface groups. In addition to this spectrum the spectrum of the methyl radical was also observed. Irradiation of adsorbed tert-butyl alcohol produced a three-line spectrum which was attributed to SiOMe2OCH2 (68). Apparently the splitting from the methyl protons was too small to be observed. 

ISOPROPYL-TERT-BUTYL-ETHER 480.2536 -1.3423E+04 -1.9683E+02 2.0283E-01... 

HEPTANOL 5-HETHYL-l-HEXANOL ISOPROPYL-TERT-BUTYL-ETHER n-HEPTYL MERCAPTAN BUTYL-PROPYL-SULFIDE ETHYL-PENTYL-SULFIDE HEXYL-METHYL-SULFIDE... 

C7H160 ISOPROPYL-TERT-BUTYL-ETHER 116.203 -139.63 221.92 liquid 4303.7 37035.6 15925.3... 

C7H160 ISOPROPYL-TERT-BUTYL-ETHER 6.875E-04 558.21 -0.7143 177.80 530.30 1.186E-03 0.750... 

Substituted cyclohexanones, bearing a methyl, isopropyl, tert-butyl or phenyl group, give, on deprotonation with various chiral lithium amides in the presence of chlorotrimethylsilane (internal quench), the corresponding chiral enol ethers with moderate to apparently high enantioselec-tivity and in good yield (see Table 2)13,14,24> 29 36,37,55. Similar enantioselectivities are obtained with the external quench " technique when deprotonation is carried out in the presence of added lithium chloride (see Table 2, entries 5, 10, and 30)593. 

Isocyanate, chlorosulfonyl-, 56, 41 Isocyanate, 2-propyl-, 56, 96 Isocyanide, benzyl-, 55, 98 Isocyanide, butyl-, 55, 98 ISOCYANIDE, tert-bulyl-, 55, 96 Isocyanide, cyclohexyl, 55, 98 Isocyanide, dodecanyl-, 55, 98 Isocyanide, ethyl-, 55, 98 Isocyanide, methyl-, 55, 98 Isocyanide, phenyl-, 55, 98 Isophorone, 57, 113 Isopropenyl acetate, 57, 113 Isopropyl alcohol, 58, 78,157 Isopropyl ether, 58, 45, 52 Isopropyl fluoride,58,78 Isopropylurea-polystyrene, 56, 96 Isoquinohne, 56, 20... 

The stability sequence for the O-trialkysilyl groups appears to be tert-butyl(tetramethylene)silyl > triisopropylsilyl > tert-butyldi-methylsilyl > isopropyl(tetramethylene)silyl > diisopropylmethyl-silyl. In all cases, the 3 -isomer (secondary position) is considerably more stable than the 5 -isomer (primary position), and this difference in reactivity permits303,304 the synthesis of a 3 -(trialkylsilyl) ether of the nucleoside from the corresponding 3, 5 -bis(trialkylsilyl) ether, in yields of 50%. 

The nature of the initiation step, which may occur in a variety of ways, is not known in all cases. Commonly used ethers such as ethyl ether, isopropyl ether, tetrahydrofuran, and />-dioxane are particularly prone to form explosive peroxides on prolonged storage and exposure to air andlight (see Peroxides and PEROXY COMPOUNDS, ORGANIC), and should contain antioxidants (qv) to prevent their build-up. One of the exceptions to the peroxide forming tendency of ethers is methyl tert-5 ky ethers such as methyl tert-butyl ether [1634-04-4] (MTBE) and ter1-axn.y methyl ether [994-05-8] (TAME). Both have shown little tendency if any to form peroxides (2,8). 

The present procedure is the best way of preparing aliphatic isocyanides boiling above ethyl isocyanide. It has been applied to the synthesis of the following isocyanides 6 isopropyl (38%), -butyl (61%), tert-butyl (68%), and benzyl (56%). In preparing isopropyl isocyanide or ferf-butyl isocyanide, the petroleum ether should be of boiling point 30-35°, as otherwise it is difficult to separate these low-boiling isocyanides in the indicated yield, and,... 

---