Glycerol tribenzoate

Method 2. Add gradually 2 -5 ml. of benzoyl chloride to a solution of 0-5 g. of glycerol in 5 ml. of pure pyridine, cooled in ice then reflux for 1 hour. Treat the cold mixture with dilute sulphuric acid this dissolves the pyridine salt and precipitates the glycerol tribenzoate. Wash it with sodium bicarbonate solution, followed by water, and recrystaUise as in Method 1. 

Glycerol tribenzoate (tribenzoin) n. A colorless, crystalline solid, a solid plasticizer for PVC. 

Cryst. (Et20/petrol). Mp 50-51°. Tribenzoyl Glycerol tribenzoate. FEMA 3398... 

Method 1. Place in a test-tube or small flask 1-3 g. of glycerol and 30 ml. of 10 per cent, sodium hydroxide solution add gradually, with simultaneous shaking, 1-2 g. of benzoyl chloride. Stopper the vessel, shake for several minutes and allow to stand. Decant the solution from the pasty solid and wash the latter with cold water by decantation. Recrystallise the solid tribenzoate from dilute rectified (or methylated) spirit or from light petroleum, b.p. 40-60° the pure compound has m.p. 76°. 

A feature of the book is the introduction of directions for the preparation of certain compounds on a very small scale. Students often acquire the habit of careless work in the laboratory practice in organic chemistry. Preparation-work on the small scale serves to counteract this effect and to develop a technique that is valuable. Such work is often necessary in the identification of unknown compounds when a small amount only of the substance is available. In many cases a crystalline derivative whose melting-point can be determined, can be prepared in a pure condition from but two or three drops of a substance. Among the examples of work of this kind which are given are the preparation of acetanilide from acetic acid, glyceryl tribenzoate from glycerol, dinitrobenzene from benzene, and dibenzalacetone from acetone. In order to facilitate such work, a section in the first chapter is devoted to a consideration of the technique used in the manipulation of small quantities of substances. 

GP plasticizers, but their commercial success has yet to be demonstrated. Tribenzoate esters of glycerol were shown to have compatibility problems, but by blending the tribenzoate glycerine esters with tri-2-ethyhexyl glycerine, the compatibility issues can be minimized [45],... 

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