Trimethylene glycol

These derivatives are generally liquids and hence are of little value for characterisation the polyhydric alcohols, on the other hand, afford solid benzoates. Thus the benzoates of ethylene glycol, trimethylene glycol and glycerol melt at 73°, 58°, and 76° respectively (see Section 111,136). 

Trimethylene Dibromide. In a 1-litre round-bottomed flask place 500 g. (338 ml.) of 48 per cent, hydrobromic acid and add 150 g. (82 ml.) of concentrated sulphuric acid in portions, with shaking. Then add 91 g. of trimethylene glycol (b.p. 210-215°), followed by 240 g. (130-5 ml.) of concentrated sulphuric acid slowly and with shaking. Attach a reflux condenser to the flask and reflux the mixture for 3 hours. Arrange for downward distillation and distil, using a wire gauze, until no more oily drops pass over (30—40 minutes). Purify the trimethylene dibromide... 

Trimethylene Di-iodide. Use 76 g. of trimethylene glycol, 27 - 52 g. of pmified red phosphorus and 254 g. of iodine. Lag the arm C (Fig. Ill, 40, ) with asbestos cloth. Stop the heating immediately all the iodine has been transferred to the fiask. Add water to the reaction mixture, decolourise with a httle sodium bisulphite, filter, separate the crude iodide, wash it twice with water, dry with anhydrous potassium carbonate and distU under reduced pressure. B.p. 88-89°/6 mm. Yield 218 g. (a colourless liquid). 

From trimethylene glycol and hydrogen bromide. Kamm and Newcomb, J. Am. Chem. Soc. 43, 2228 (1922). 

Thionyl chloride Thiophosgene Titanium tetrachloride Trichloromethyl perchlorate Triformoxime trinitrate Trimethylacetyl chloride Trimethylene glycol diperchlorate Trimethylol nitromethane trinitrate... 

The phase behavior of several polybibenzoates with oxyalkylene spacers has been reported [11,14,15,20-27]. These spacers include the dimer of trimethylene glycol and different ethylene oxide oligomers. The most noticeable characteristic of these polybibenzoates with ether groups in the spacer is the considerable decrease of the rate of the mesophase-crystal transformation. Thus, Fig. 8 shows the DSC curves corresponding to a sample of poly[oxybis(trimethylene)p,p -bibenzoate], PDTMB, with a structure similar to that of P7MB but with the... 

Dimethyl carbonate (DMC) is a colorless liquid with a pleasant odor. It is soluble in most organic solvents but insoluble in water. The classical synthesis of DMC is the reaction of methanol with phosgene. Because phosgene is toxic, a non-phosgene-route may be preferred. The new route reacts methanol with urea over a tin catalyst. However, the yield is low. Using electron donor solvents such as trimethylene glycol dimethyl ether and continually distilling off the product increases the yield. ... 

The material boiling above 65°/io mm. is chiefly trimethylene glycol and is used in a succeeding experiment. The final yield of trimethylene chlorohydrin (Note 5) boiling at 6o-64°/io mm. is 835-1000 g. from 1800 g. of trimethylene glycol (50-60 per cent of the theoretical amount), and 400-450 g. of trimethylene glycol is recovered. 

If sulfuric and hydrochloric acids are used then for the conversion of 1800 g. of trimethylene glycol, a 20-I. bottle half-filled with concentrated sulfuric acid is treated with concentrated hydrochloric acid introduced through a tube reaching to the bottom. The hydrochloric acid is added at the rate of 30-40 drops per minute. Two charges of sulfuric acid are needed and a total of about 24 kg. of hydrochloric acid. 

Propanediol (Trimethylene glycol, 1,3-Di-hydroxypropane). CH2OH.CH2.CH2OH mw 76.09 color to pale yel, very vise, sweet liq mp, freezes in a mixt of dry ice and eth bp... 

Trimethylene dibromide, dl21 Trimethylene dimercaptan, pi95 Trimethylene glycol, pi92 Trimethylethylene, ml66 Trimethylgermanium bromide, b437... 

Figure 11.9 Dynamic mechanical storage ( ) and loss ( ") moduli of isotropic PTT at 11 Hz showing the three relaxations [61]. From Dynamic mechanical relaxations of polyterephthalates based on trimethylene glycols, Gonzalez, C. C., Perena, J. M. and Bello, A., J. Polym. Sci., Polym. Phys. Ed., 26,1397-1408 (1988), Copyright (1988 John Wiley Sons, Inc.). Reprinted by permission of John Wiley Sons, Inc...

Fermentol (also Pratol Glycerine or Pro-toglycerine), A glycerine produced in Germany from sugar by a fermentation process. Trimethylene glycol in the product evolves more heat than glycerine on nitration, is more soluble in the mixed acid, and thus contributes to fume-offs Refs 1) Naoura, NG(1928), pp 31, 229 2) Marshall 3(1932), p 42... 

Problem 14.46 Give the structural formulas for (a) ethylene glycol, (b) propylene glycol, and (c) trimethylene glycol. <... 

Hydrocarbons, CHCI3, dioxane and tetra-hydrofuran. Not alcohols. Phase must be saturated with trimethylene glycol. 

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