Pentyl ether

C to give the expected 2-methyl-1-butene in high selectivites (24). The AI2O2 catalyzed process can be optimized to give di- -pentyl ether as the exclusive product (23). Dehydration of 1-pentanol over an alkah metal promoted AI2O2 catalyst at 300—350°C provides 1-pentene at selectivities of 92% (29,30). Purification produces polymerization grade (99.9% purity) 1-pentene. A flow chart has been shown for a pilot-plant process (29). 

In this way isopentyl pentyl ether, heptyl pentyl ether, and 4,5-bis-methoxymethyI-2,2-dimethylheptane were also prepared from the appropriate thiophene derivatives. ... 

Butoxyethanol Dimethoxyethane Diethyleneglycol Dihydropyran 2-Methoxyethanol Di butyl ether 01 pentyl ether Triethyleneglycol... 

The liquid-phase dehydration of 1-hexanol and 1-pentanol to di-n-hexyl ether (DNHE) and di-n-pentyl ether (DNPE), respectively, has been studied over H-ZSM-5, H-Beta, H-Y, and other zeolites at 160-200°C and 2.1 MPa. Among zeolites with a similar acid sites concentration, large pore H-Beta and H-Y show higher activity and selectivity to ethers than those with medium pores, although activity of H-ZSM-5 (particularly in 1-pentanol) is also noticeable. Increased Si/Al ratio in H-Y zeolites results in lower conversion of pentanol due to reduced acid site number and in enhanced selectivity to ether. Selectivity to DNPE is always higher than to DNHE... 

The yield of ethyl n -pentyl ether formed from the reduction of 1-pentanal by Et3SiH/TFA in ethanol is 57% after 6-8 hours at 50-60°.327 The yield of product increases to 72% when one equivalent of ethyl orthoformate and some anhydrous hydrogen chloride are added to the reaction medium.327 Presumably, this reduces the amount of free water in the reaction medium. 

Di-w -pentyl Ether [TMSI-Catalyzed Reduction of an Aldehyde to a Symmetrical Ether].314 A mixture of sodium iodide (0.15 g, 1 mmol), 1-pentanal (1.06 mL, 10 mmol), and trimethylsilyl chloride (2.0 mL, 15.4 mmol) was stirred in MeCN (5.0 mL) at room temperature for 10 minutes, after which 1,1,3,3-tetramethyldisiloxane (TMDO, 1.79 mL, 10 mmol) was added. When the exothermic reaction had ended (30 minutes), a solution of 2.5 N HF in MeOH (30 mL) was added to the reaction mixture, which was then refluxed for 5 minutes. Work-up was carried out by diluting the solution with CH2CI2 (40 mL), washing with water (30 mL) and saturated aqueous NaHC03 solution (20 mL), drying, and evaporating the solvents. Crude di-n-pentyl ether was purified by distillation 0.65 g (84%) bp 185-1897760 Torr. 

C6H140 METHYL tert-PENTYL ETHER 7.146E-04 534.00 -0.7143 160.00 507.30 1.281E-03 0.766... 

Methyl ferf-pentyl ether [994-05-8] 23 -2.72 Miller and Stuart, 2000... 

The enthalpy of formation of methyl n-pentyl ether is unavailable from experiment, but a value of —316 kJmoP is obtained from the linear regression analysis of the known enthalpies of formation of methyl n-alkyl ethers vs. the number of carbon atoms in the ethers . The methylene increment of —25.3 kJmoP for this homologous ether series is nearly identical to the methylene increment for n-alkanes. Because the experimental protodelithiation enthalpies for the two primary lithio ethers are identical, the methylene increment in that homologous series as calculated here is necessarily identical to that of the homologous methoxy ethers. As calculated from the methylene increment or from equation 16, the enthalpy of formation of 5-lithiopentyl methyl ether is ca —309 kJmol. ... 

The liquid enthalpies of formation of ethyl methyl ether (methoxyethane) and methyl n-pentyl ether (1-methoxypentane) were extrapolated as —240.2 kJ mol and —316.4 kJ mol , respectively, from the data for 1-methoxypropane, 1-methoxy butane and 1-methoxydecane. H. A. Swain, Jr., L. S. Silbert and J. G. MiUer, J. Am. Chem. Soc., 86, 2562 (1964). 

Problem 14.54 Are the mie peaks 102, 87, and 59 (base peak) consistent for n-butyl ethyl ether (A) or methyl n-pentyl ether (B) Give the structure of the fragments which justify your answer. 

No epidemiological data relevant to the carcinogenicity of bis(2,3-epoxycyclo-pentyl)ether were available. 

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