At Normal Pressure

Neutron diffraction studies on polycrystalline EuSe down to 2.1 K exhibited antiferromagnetic EuSe only, Pickart, Alperin [17]. However, early initial susceptibility data of nearly spherical crystals down to 1.6 K by Schwob, Vogt [18] and the temperature dependence of the absorption edge indicated the existence of ferrimagnetic EuSe below 2.8 K, Busch [19] (the temperature of 3.8 K was reported by [18]). 

Magnetization studies on single crystal spheres with fields in the [110], [111], and [100] directions indicate that the NNS state at 1.4 K can be easily modified into a canted spin state, Fukuma et al. [21]. 

Extensive magnetization studies on single crystalspheres with afield applied along a (112) direction in a (111) plane show that the transitions at Hi and H2 are first-order below 4.48 K, and higher than first-order above that temperature up to T, = 4.63 0.02 K. This is tentatively interpreted as tricritical behavior. The high field phase (H H2) is interpreted as being either 

Regarding H2 at 2.2 K, nearly spherical ferrimagnetic crystallites became ferromagnetic at H (int.) = 1.53 kOe (Ha = 2 kOe) according to magnetization data by Busch et al. [23], Schwob [24]. Polycrystalline material at 2.1 K required Ha = 7.9 kOe, Pickart, Alperin [17]. 

No anomaly was detected in the heat capacity (0.3% resolution) in the range 4.3 to 4.55 K with values of magnetic fields corresponding to H (int.) = 225, 400, 600, and 700 Oe, Johanson [14], cf. Johanson, McCollum [7] i.e., in the region where Everett [25] suggested a phase transition based on the phase diagram given by Kwon [3]. 

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Boublik "Vapor-Liquid Equilibrium Data at Normal Pressures," Pergamon, Oxford, 1968. 

The aqueous layer was extracted with diethyl ether. The combined ethereal solutions were dried over potassium carbonate, after which the greater part of the diethyl ether was distilled off at normal pressure through a 40-cm Vigreux column (bath temperature < 90°C). Careful distillation of the remaining liquid afforded the bis-ether, b.p. 47-49°C/18 mmHg, Op 1.4469, in 78% yield. 

Widmer column. The remaining liquid was also distilled at normal pressure, using... 

In a similar way H2C=C=CH-SC2H5, b.p. 30 c/12 nmHg, n 1.5210, was prepared in 864 yield from CH3C=C-SC2H5. After the greater part of the solvent had been distilled off at normal pressure (bath temperature below 70°C), the remaining liquid was distilled at water-pump pressure and collected in a single receiver... 

The greater part of the pentane was distilled off at normal pressure through a... 

The layers were separated and four extractions with the light petroleum fraction (50-ml portions) were carried out without delay (note 1). The combined extracts were washed with ice-water and subsequently dried over magnesium sulfate. The solution was warmed in a water-pumpvacuum and the ethoxyacetylene condensed in a receiver cooled at -80°C (see Chapter I for the description of this procedure). Redistillation of the contents of the receiver at normal pressure (760 nmHg) through a 40-cm Vigreux column gave ethoxyacetylene, b.p. 52°C, n ° 1.3820 in 62-702 yield. 

Widmer column gave butylallene, b.p. 105 C/760 mmHg, n 1.4332. The remaining liquid was distilled in a partial vacuum (60-100 mmHg, b.p. 40-70°C) and the distillate was redistilled at normal pressure to give an additional amount of butylallene, bringing the yield to 72-78%. 

Note 2. In order to minimize the hold-up. a partial vacuum (ea. 100 mmHg) may be applied during the last stage of the distillation the fraction obtained in this way can be redistilled at normal pressure in a small distillation apparatus. 

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