Activation hexane

Smooth muscle relaxant activity. Hexane extract of the dried fruit, administered to guinea pigs at a concentration of 0.15 mg/ mL, was active on bladder and ileum vs KCl-induced contractions R . Administration to... 

Antimutagenic activity. Ethanol (70%) extract of the dried aerial parts, on agar plate, was inactive on Escherichia coli PQ37 vs mitomycin-induced mutagenesis, assessed by the SOS-chromotest method Antioxidant activity. Hexane and methanol extracts of the dried seed, tested on lard at a concentration of 0.06 %, were inactive Seed oil, at undiluted concentration, was active " . Acetone extract of the seed, at a concentration of 0.2 mg/kg, was active. Linoleic acid was used as a substrate in this test " . 

Candida cylindracea Methanol Butanol Waste activated Hexane 78% Lara and Park,... 

With AlEt3 or AlEt2Cl activation, hexane soluble polymer content of the polypropylene produced is lowest near the same temperature of 60° C., but with AlEt2OEt activation it reaches a high value at 60° C. The LVN tends to decrease with rising temperature. 

Also, the radix of A. heterotropoides var. mandshuricumm has been used in Chinese and Japanese traditional medicine and is also the important component of prescriptions. From the active -hexane fraction obtained from original MeOH extract of the radix of A. heterotropoides var. mandshuricum, six compounds (42 - 47) were isolated and their inhibitory effects on EBV-EA activation were examined. Of these compounds, lignans (46 and 47) exhibited more remarkable effects (more than 70% and 30% inhibitions at 5 x ICF mol ratio/TPA and 1 x 10 mol ratio/TPA, respectively) than phenylpropanoids (42 - 45) and preserved high viability of the Raji cells even at the highest concentration as shown in Table 5. Further, the effect of 46 on the cell cycle of Raji cells treated with TPA was also examined. 

The root has been utilized as a tonic in southeast Asia and as a choleretic drug in Europe. The active -hexane extract against Sarcoma 180A in mice... 

The active hexane fraction was subjected to HPLC on a silver-nitrate coated silica column (2) as described for (7. hemipterus (5) 25% toluene-hexane was used as the solvent. Fractions 0.5 ml in volume were collected and bioassayed (Table I). The activity eluted primarily in a fraction 5.5-6.0 ml after injection. This elution volume was well beyond the solvent front (3.0 ml) thus, there was evidence for unsaturation. However, the activity eluted slightly before the tetraenes (1 and 2) previously isolated from C. hemipterus, which occurred in fractions 6.0-7.5 ml after injection. 

A different kind of shape selectivity is restricted transition state shape selectivity. It is related not to transport restrictions but instead to size restrictions of the catalyst pores, which hinder the fonnation of transition states that are too large to fit thus reactions proceeding tiirough smaller transition states are favoured. The catalytic activities for the cracking of hexanes to give smaller hydrocarbons, measured as first-order rate constants at 811 K and atmospheric pressure, were found to be the following for the reactions catalysed by crystallites of HZSM-5 14 n-... 

Purification of anthracene. Dissolve 0-3 g. of crude anthracene (usually yellowish in colour) in 160-200 ml. of hexane, and pass the solution through a column of activated alumina (1 5-2 X 8-10 cm.). Develop the chromatogram with 100 ml. of hexane. Examine the column in the hght of an ultra-violet lamp. A narrow, deep blue fluorescent zone (due to carbazole, m.p. 238°) will be seen near the top of the column. Immediately below this there is a yellow, non-fluorescent zone, due to naphthacene (m.p. 337°). The anthracene forms a broad, blue-violet fluorescent zone in the lower part of the column. Continue the development with hexane until fluorescent material commences to pass into the filtrate. Reject the first runnings which contain soluble impurities and yield a paraffin-hke substance upon evaporation. Now elute the column with hexane-benzene (1 1) until the yellow zone reaches the bottom region of the column. Upon concentration of the filtrate, pure anthracene, m.p. 215-216°, which is fluorescent in dayhght, is obtained. The experiment may be repeated several times in order to obtain a moderate quantity of material. 

Methyllithium. MethyUithium [917-54 ] CH Li, crystallizes from benzene or hexane solution giving cubic crystals that have a salt-hke constitution (128). Crystalline methyllithium molecules exist as tetrahedral tetramers (129). Solutions of methyllithium are less reactive than those of its higher homologues. Methyllithium is stable for at least six months in diethyl ether at room temperature. A one-molar solution of methyllithium in tetrahydrofuran (14 wt %) and cumene (83 wt %) containing 0.08 M dimethyknagnesium as stabilizer loses only 0.008% of its activity per day at 15°C and is nonpyrophoric (117). 

Fig. 4. Activity vs polymerization time. Polymerization occurs in hexane at 343 K (70°C) and 0.7 MPa (7 bat) with a superactive third-generation catalyst...

Fig. 6. Activity and isotacticity vs Al/donor ratio. Batch polymerisation occurs ia diluent hexane at 70°C and 0.7 MPa (7 bar) for 4 h with a superactive...

Pla.tinum. Platinum catalysts that utilize both phosphine and tin(Il) haUde ligands give good rates and selectivities, in contrast to platinum alone, which has extremely low or nonexistent hydroformylation activity. High specificity to the linear aldehyde from 1-pentene or 1-heptene is obtained using HPtSnClgCO(1 1P) (26), active at 100°C and 20 MPa (290 psi) producing 95% -hexanal from 1-pentene. 

Asphaltenes seem to be relatively constant in composition in residual asphalts, despite the source, as deterrnined by elemental analysis (6). Deterrnination of asphaltenes is relatively standard, and the fractions are termed / -pentane, / -hexane, / -heptane, or naphtha-insoluble, depending upon the precipitant used (5,6,49). After the asphaltenes are removed, resinous fractions are removed from the maltenes-petrolenes usually by adsorption on activated gels or clays. Recovery of the resin fraction by desorbtion is usually nearly quantitative. 

In the fibrous acetylation process, part or all of the acetic acid solvent is replaced with an inert dilutent, such as toluene, benzene, or hexane, to maintain the fibrous stmcture of cellulose throughout the reaction. Perchloric acid is often the catalyst of choice because of its high activity and because it does not react with cellulose to form acid esters. Fibrous acetylation also occurs upon treatment with acetic anhydride vapors after impregnation with a suitable catalyst such as zinc chloride (67). 

Terminal activity coefficients, 7°, are noted in Figure 3. These are often called infinite dilution coefficients and for some systems are given in Table 1. The hexane—heptane mixture is included as an example of an ideal system. As the molecular species become more dissimilar they are prone to repel each other, tend toward liquid immiscihility, and have large positive activity coefficients, as in the case of hexane—water. 

In contrast to the hydrolysis of prochiral esters performed in aqueous solutions, the enzymatic acylation of prochiral diols is usually carried out in an inert organic solvent such as hexane, ether, toluene, or ethyl acetate. In order to increase the reaction rate and the degree of conversion, activated esters such as vinyl carboxylates are often used as acylating agents. The vinyl alcohol formed as a result of transesterification tautomerizes to acetaldehyde, making the reaction practically irreversible. The presence of a bulky substituent in the 2-position helps the enzyme to discriminate between enantiotopic faces as a result the enzymatic acylation of prochiral 2-benzoxy-l,3-propanediol (34) proceeds with excellent selectivity (ee > 96%) (49). In the case of the 2-methyl substituted diol (33) the selectivity is only moderate (50). 

Table 13-1, based on the binary-system activity-coefficient-eqnation forms given in Table 13-3. Consistent Antoine vapor-pressure constants and liquid molar volumes are listed in Table 13-4. The Wilson equation is particularly useful for systems that are highly nonideal but do not undergo phase splitting, as exemplified by the ethanol-hexane system, whose activity coefficients are snown in Fig. 13-20. For systems such as this, in which activity coefficients in dilute regions may...

FIG. 13-20 Liqi lid-phase activity coefficients for an ethanol-n-hexane system, [Henleij and Seader, Eqiiilihriiim-Stage Separation Operations in Chemical Engineering, Wileif, New York, 1931 data of Si nor and Weher, J, Chem, Eng, Data, 5, 243-247 (I960).]... 

A similar procedure has been employed to silylate the dianion of 3-methyl-3-buten-2-ol (67% yield).In systems where such internal activation is not possible (e.g. 2-raethyl-2-cyclohexen-l-o1), dianion formation can be performed in hexane to give a 75% yield of the corresponding disilyl compound. 

Bibenzyl [103-29-7] M 182.3, m 52.5-53.5 . Crystd from hexane, MeOH, or 95% EtOH. It has also been sublimed under vacuum, and further purified by percolation through columns of silica gel and activated alumina. 

SO as to end the air mixture to adsorber No. 2. The system is then fully automatic. Solvents which have been successfully recovered by the activated carbon adsorption method include methanol, ethanol, butanol, chlorinated hydrocarbons including perchlorethylene, which boils at 121 C (250 °F), ethyl ether, isopropyl ether, the acetates up to amyl acetate, benzene, toluene, xylene, mineral spirits, naphtha, gasoline, acetone, methyl ethyl ketone, hexane, carbon disulfide, and others. 

The rhodium catalyst (46 mg) is dissolved in acetone (10 ml) in a microhydrogenation apparatus which is then flushed three times with deuterium gas. After stirring the solution in an atmosphere of deuterium for about 1 hr the deuterium uptake ceases and constant pressure is attained. 5a-Cholest-2-ene (136, 19.5 mg) is added and the stirring continued until deuterium uptake ceases (about 3/4 hr). The solvent is evaporated to dryness and the residue is extracted with hexane and the resulting solution filtered through a small alumina column (3 g, activity 111). Evaporation of the hexane gives 2, 3 -d2-5oc-cholestane (137) 18 mg, 92% mp 78-79° isotope composition 94%d2,5%d, andl%do. ... 

A solution of cholest-4-en-3-one (139), 1 g, in diethylene glycol dimethyl ether (20 ml) is treated for 1 hr with a large excess of diborane at room temperature under nitrogen and then left for a further 40 min. Acetic anhydride (10 ml) is added and the solution refluxed for 1 hr. The mixture is concentrated to a small volume, diluted with water and extracted with ether. The extracts are washed with 10% sodium hydroxide solution, then with water and dried over sodium sulfate. Removal of the solvent leaves a brown oil (1.06 g) which is purified by chromatography on alumina (activity I). Hexane elutes the title compound (141), 0.68 g mp 76-77°. Successive crystallization from acetone-methanol yields material mp 78-79°, [a]p 66°. 

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