Indene 278 INDEX

The indene ( d 5 1.5698, b.p. 74-76°/24 mm.) was obtained from Rutgerswerke, A. G., West Germany, through Terra Chemicals, Inc., 500 Fifth Avenue, New York 36, N. Y. It was faintly yellow, but was used without distillation, since distillation, although it removed the yellow color, did not change the refractive index. When Matheson, Coleman and Bell technical grade indene was used (redistilled, d 5 1-5606, b.p. 177-179°), a 45% yield of 2-indanone was obtained. 

Cyclic Compounds. The Patterson-Capell Ring Index is the greatest single contribution to chemical nomenclature of recent years. Yet it has not been adopted in toto in Britain because some older methods are retained which are in general based on those of Richter. One principle, for instance, which is not favored is exemplified by the varied numbering of, say, the indene skeleton for which there... 

Indene n. C9H8. Colorless liquid with a Sp gr of 1.006 (20/4°C), mp of 3.5°C, bp of 182°C, refractive index of 1.5726, and a flp of 78.3°C. Insoluble in water, soluble in most organic solvents, rapidly absorbs oxygen from the air, forms polymers by exposure to air and sunlight. Derivation Contained in the fraction of crude coal tar distillates, which boils from 176 to 182°C. Uses Preparation of synthetic resins. 

Ethyl Acetate n (1874) CH3COOC2H5. A colorless liquid made by heating acetic acid and ethyl alcohol in the presence of sulfuric acid, then distilling. It is a powerful solvent for ethyl cellulose, polyvinyl acetate, cellulose acetate-butyrate, acrylics, polystyrene, and coumarone-indene resins. It is also used in flexographic and rotogravure inks. Although it is highly flammable, it is the least toxic of common industrial solvents. Properties bp, 77°C sp gr, 0.—901/20°C flp. 0.56°C (31°F) refractive index, 1.373 vp, 77 mm Hg/20°C. Also known as Acetic Ether and Acetic Ester. 

Some cychc skeletons require a CH2 component these components are to be indicated by H preceded by a numeral, except when in common compounds such as indene or fluorene its position can be assumed to be the normal one. Thus 3jff-fluorene is (VI). (This is an improvement on the practice of the first edition of the Bing Index and was adopted in the second edition.)... 

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