Monoglyme

In what may be an example of tme cluster catalysis, [HRU3 (CO) ] shows good catalytic activity and high regioselectivity using propylene as substrate (24,25). Solvent, CO partial pressure, and temperature are important variables. In monoglyme, at 80°C and starting partial pressures for C H, ... 

Ethylene glycol dimethyl ether (monoglyme) [110-71-4] M 90.1. See 1,2-dimethoxyethane on... 

Butylation of ethyl phenylacetate, /-butyl phenylacetate, and ethyl 2-phenylhexanoate has also been accomplished with M-butyl bromide and sodium hydride in refluxing monoglyme in 64%, 66%, and 56% yields, respectively.6 In contrast to the sodium amide reactions above, however, careful fractionation of the crude products was required to obtain pure products. 

Monoglyme, 3 248 Monohydroxo-bridged complexes acid-base equilibria, 32 107-108... 

Vapor-liquid equilibria (VLE) for binary mixtures of halothane with propyl ether (PE), isopropyl ether (IPE), 1,4-dioxane (DOX) and 2,5-dioxahexane (monoglyme)... 

In particular, it was essential that traces of diisopropylamine were removed in vacuo before the addition of monoglyme, followed by the halofluoromethane. 

Thermodynamic Study of Hydrobromic Acid in Water-1,2-Dimethoxyethane (Monoglyme) from EMF Measurements... 

Figure 1. Plot of dielectric constant vs. mass percent monoglyme for 0,10, 30, 50, 70, 00, and 100 mass percent monoglyme-water mixtures at 298.15°K...

Values of the right-hand side of Equation 6 (that is, those denoting the term E0/) are expected to be linear in terms of m, when a suitable value for the ion-size parameter is chosen. Several different values for a0 (e.g., 0.2, 0.4, 0.6, and 0.8 nm) were tested, and the computer calculations showed that the deviations of E0/ vs. m from linearity were at a minimum when a0 is equal to 0.6 nm. These results are shown in Table VIII. By means of Equation 6, the intercepts of the extrpolation lines (E°) can be found and the slopes (—2k(3) computed. The values of the standard emf are summarized in Tables IV, V, and VI for x = 10,30, and 50 mass percent monoglyme, together with the standard deviations of the intercepts (E°). For a0 = 0.6 nm, the values of are entered in Table IX. 

The mean ionic activity coefficients of hydrobromic acid at round molalities (calculated by means of Equation 2) are summarized in Tables XI, XII, and XIII for x = 10, 30, and 50 mass percent monoglyme. Values of —logio 7 at round molalities from 0.005 to 0.1 mol-kg-1 were obtained by interpolating a least squares fit to a power series in m which was derived by means of a computer. These values at 298.15° K are compared in Figure 2 with those for hydrochloric acid in the same mixed solvent (I) and that for hydrobromic acid in water (21). The relative partial molal enthalpy (H2 — Hj>) can be calculated from the change in the activity coefficient with temperature, but we have used instead the following equations ... 

Figure 2. Plot of —logio 7 vs. m1/2/or hydrobromic acid in 50 mass percent monoglyme, hydrochloric acid in 50 mass percent monoglyme, and hydrobromic acid in water at 298.15°K. The dashed line represents the Debye-Hixckel limiting slope.

The values of (H2 — Hj ) for rounded molalities at 298.15° K were obtained from the plots of (H2 — H >) against ra1/2. The smooth curve was drawn through all the experimental points the average deviation from the smoothed curve was 15 calth mol-1 for 50 mass percent monoglyme. These values are presented in Table XIV and are higher than those found for hydrochloric acid in the same mixed solvents (1). The values of (H2 — H%) in aqueous medium at 298.15° K are given for direct comparison. The relative partial molal heat capacity (Cp — Cp) was calculated by the following formula ... 

The values for these quantities at x = 50 mass percent monoglyme at 298.15° K are summarized in Table XIV and are compared with those for hydrobromic acid in water (21). 

The standard deviations of regression between the experimental data and the values obtained from the above equations are 0.03, 0.03, and 0.12 mV for x = 10, 30, and 50 mass percent monoglyme, respectively. 

We are concerned here with the solvent effects on the equilibrium behavior of acids and bases in dipolar aprotic solvents, such as monoglyme in x = 10, 30, and 50 mass percent mixed solvent compositions. The following reaction is of particular interest in such a study ... 

Figure 3. Plots of AG vs. 1/e at 298.15°K for hydrochloric acid and hydrobromic acid in monoglyme-water mixtures...

---