Methyl rerf-butyl ether

Other ethers, like methyl-rerf-butyl ether (MTBE) and ethyl-rm-butyl-ether (ETBE) have been used as additives instead of aromatic compounds in fuels to... 

Pervaporation of methanol and methyl rerf-butyl ether (MTBE) using hollow fibers coated with polypyrrole, poly(A/-methylpyrrole), and polyaniline was studied by Martin et al. [77]. A microporous hollow-fiber ultrafiltration membrane made of cellulose was coated with a conjugated polymer. An uncoated hollow fiber had only a slight preference for transporting methanol ( tnethanoi/MTBE = 1.06), attributed to the more polar methanol being more soluble in the somewhat polar cellulose-based film. The polypyrrole-coated fiber had only... 

Methyl tert- mXy ether, MTBE, and ethyl rerf-butyl ether, ETBE, are added to gasoline in order to increase the efficiency of gasoline combustion, which reduces the quantity of volatile organic compounds (VOCs) that escape into the atmosphere and cause smog. The chemical industry is very interested in using MTBE as a substitute for THE and diethyl ether, because autoxidation of THE and diethyl ether is a major safety problem for chemieal companies. The industry is less interested in ETBE as a solvent substitute. 

Methylpropene Methanol rerf-Butyl methyl ether... 

The silver(I)-catalyzed addition of methanol to methylenecycloproparenes resulted in methyl aryl ethers 5, but with l-benzylidenecyclopropa[i]naphthalene an acetylene 7 was formed in addition. The acetylene 7 became the major reaction product when methanol was replaced by rerf-butyl alcohol. ... 

Some of the polymers slowly change their helicity in solution. A chiral crown ether-potassium rerf-butoxide combined system was reported to cause polymerization of methyl, rerr-butyl, and benzyl methacrylate to form isotactic polymers that had high rotation values (164). Detailed scrutiny, however, raised questions about the result (135, 165). At first, in the presence of the initiator, the oligomers exhibit considerable activity, but after removal of the catalyst, the optical activity decreases. This decrease may be attributed to unwinding of the helixes in the chain the helicity could be caused by the anchored catalyst. 

To a suspension of 2.24 g (20 mmol) of potassium rerf-butoxide in 20 mL of terf-butyl methyl ether under argon is added 2.31 g (10 mmol) of (S)-2-(methoxymethyl)-1-[( )-3-phenyl-2-propenyl]pyrrolidine30, and then the mixture is cooled lo — 78 °C and 7.1 mL of 1.69 M fm-butyllithium in pentane is added dropwise with stirring. After 2 h, 12 mmol of the haloalkane are added and the mixture is stirred until the brown-red solution becomes yellow. Then 30 mL of diethyl ether and 20 mL of 2 N hydrochloric acid are added, the mixture stirred for 12 h at 25 °C, extracted with three 40-mL portions of CH2CI2, the organic layer is washed with two 10-mL portions of NaHCOj and two 10-mL portions of water, dried with Na2S04, concentrated in vacuo and distilled (Kugelrohr). 

After completion of reaction, remove excess THF and unreacted amine from the reaction mixture with a rotary evaporator and precipitate the PEG-bound N,(N -rerf-butoxycarbonylamidmo)urea by slow addition of cold lert-butyl methyl ether (25 mL). 

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