Di--propyl ether

Diethyl ether, b.p. 35 . Di n-propyl ether, b.p. 90. Di propyl ether, b.p. 67 5. Anxsole methyl phenyl ether), b.p. 154 . Phenetole (ethyl... 

Suitable entrainers from the above list are toluene, di-propyl-ether and n-propyl acetate. The first one may be skipped as it is an undesired impurity. Di-propyl-ether is suitable practically insoluble in water and low reciprocal solubility, of the order of 4%. Moreover, it is a byproduct of the reaction. The choice is n-propyl-acetate is convenient too, such as sharing the same alcohol with the fatty ester. 

Another remarkable example of a solvent-induced ehange in enantioselectivity is the partial hydrolysis of achiral 4-aryl-substituted l,4-dihydro-2,6-dimethyl-3,5-pyridine diearboxylie diesters, catalysed by a lipase from Pseudomonas sp., leading either to the (P)- or (5)-eonfigured monoesters. Whereas in water-saturated di-/-propyl ether, the S)-monoesters are obtained with ee values up to 99%, the (P)-monoesters are formed in water-saturated eyclohexane with ee values of 88-9 l%i [316]. 

The Menschutkin-type Sn2 reaction of triphenylphosphane with iodomethane has been studied in thirteen solvents [500]. In propylene carbonate, this reaction is 245 times faster than in di-/-propyl ether. In agreement with the highly dipolar activated complex, large solvent-dependent negative activation volumes, tsV, have been obtained as a... 

C6H10 cyclohexene 110-83-8 7.400E+09 57.040 8993 C6H140 di propyl ether 111-43-3 1.022E-F10 71.960... 

A different type of experiment demonstrates the viability of an intermediate protonated cyclopropane. Isopropyl cation (fPr ) was generated in the EBFlow by 70 eV electron bombardment of di- -propyl ether (0.0004 mbar) in the presence of ethylene (0.0013 mbar). This reaction yields... 

Abbreviations used for the techniques are defined in table I-F-3. Placed on an absolute basis using (OH+di- -propyl ether) section III-B-6.1). 

Fig. 4. Plot of pKa s of various bases vs. solubility of HCl at 10 in them (1) Methanol (2) methyl -butyl ether (3) diethyl ether (4) di- -Propyl ether (5) di-isopropyl ether (6) di- -butyl ether (7) tetrahydrofuran (8) tetrahydropyran (9) dioxane (10) anisole (11) phenetole (12) acetic acid (13) propionic acid (14) ethyl benzoate.

Ethers. Diethyl ether, di-n-propyl ether, di-isopropyl ether, ani ... 

The inflammable solvents most frequently used for reaction media, extraction or recrystallisation are diethyl ether, petroleum ether (b.p. 40-60° and higher ranges), carbon disulphide, acetone, methyl and ethyl alcohols, di-Mo-propyl ether, benzene, and toluene. Special precautions must be taken in handling these (and other equivalent) solvents if the danger of Are is to be more or less completely eliminated. It is advisable to have, if possible, a special bench in the laboratory devoted entirely to the recovery or distillation of these solvents no flames are permitted on this bench. 

Di-teo-propyl ether. The commercial product usually contains appreciable quantities of peroxides these should be removed by treatment with an acidified solution of a ferrous salt or with a solution of sodium sulphite (see under Diethyl ether). The ether is then dried with anhydrous calcium chloride and distilled. Pure di-iao-propyl ether has b.p. 68-5°/760 mm. 

CAUTION. Ethers that have been stored for long periods, particularly in partly-filled bottles, frequently contain small quantities of highly explosive peroxides. The presence of peroxides may be detected either by the per-chromic acid test of qualitative inorganic analysis (addition of an acidified solution of potassium dichromate) or by the liberation of iodine from acidified potassium iodide solution (compare Section 11,47,7). The peroxides are nonvolatile and may accumulate in the flask during the distillation of the ether the residue is explosive and may detonate, when distilled, with sufficient violence to shatter the apparatus and cause serious personal injury. If peroxides are found, they must first be removed by treatment with acidified ferrous sulphate solution (Section 11,47,7) or with sodium sulphite solution or with stannous chloride solution (Section VI, 12). The common extraction solvents diethyl ether and di-tso-propyl ether are particularly prone to the formation of peroxides. 

Compounds which dissolve in concentrated sulphuric acid may be further subdivided into those which are soluble in syrupy phosphoric acid (A) and those which are insoluble in this solvent (B) in general, dissolution takes place without the production of appreciable heat or colour. Those in class A include alcohols, esters, aldehydes, methyl ketones and cyclic ketones provided that they contain less than nine carbon atoms. The solubility limit is somewhat lower than this for ethers thus n-propyl ether di olves in 85 per cent, phosphoric acid but n-butyl ether and anisole do not. Ethyl benzoate and ethyl malonate are insoluble. 

When carried out under standard conditions with Et3SiH/TFA, reduction of acrolein leads to a mixture of allyl alcohol, 1-propanol, and di-n-propyl ether in addition to allyl trifluoroacetate and -propyl trifluoroacetate.434 The 1,2-reduction of cinnamaldehyde with triethoxysilane in the presence of fluoride ion provides the corresponding allyl alcohol in good yields (Eq. 261). 

In particular solvents such as diethyl- and di-iso-propyl-ether a rapid reaction between Co4(CO)i2 and the anion [Co(CO)4]- is observed ... 

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