If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the rubber and gutta hydrocarbons from large quantities of crude chicle. In one, the ...
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If, following the solvent extraction of a hydrocarbon from a plant, it is not known whether it is one or the other, a method of distinguishing the two is described by HENDRICKS, WILDMAN and JONES (1946). The technique involves the infra-red absorption spectra of the two isomers. At about 12 mp. the relative absorption coefficient of rubber is 42% greater than for gutta. ScHLESINGER and LEPER (1951) describe two procedures for separation of the rubber and gutta hydrocarbons from large quantities of crude chicle. In one, the chicle is extracted with benzene which dissolves both isomers. An excess absolute ethyl acetate is added and the mixture stored at 5??? C overnight. The gutta precipitates out and the rubber remains in solution. The other method is as follows: (1) Ten grams of chicle are extracted with acetone for 24 hours in a Soxhlet extraction apparatus. (2) The insoluble material in the thimble is allowed to .. it dry, then immersed in 150 ml. of cold Skellysolve B in a refrigerator at 10??? C and??? allowed to stand for 48 hours with occasional agitation. (3) The thimble is then removed from the solvent and the enclosed residue washed several times with fresh, cold Skellysolve B. (4) An excess of acetone and a few drops of a concentrated aqueous solution of sodium iodide are added to the combined Skellysolve B extract and washings and allowed to stand overnight in a refrigerator.
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Add this copy of Clara Schumann an Artist's Life Based on Material Found to cart. $29.77, new condition, Sold by Books2anywhere rated 5.0 out of 5 stars, ships from Fairford, GLOUCESTERSHIRE, UNITED KINGDOM, published 2007 by Read Books.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Clara Schumann an Artist's Life Based on Material Found to cart. $31.32, new condition, Sold by Paperbackshop International rated 2.0 out of 5 stars, ships from Fairford, GLOS, UNITED KINGDOM, published 2007 by Read Books.
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PLEASE NOTE, WE DO NOT SHIP TO DENMARK. New Book. Shipped from UK in 4 to 14 days. Established seller since 2000. Please note we cannot offer an expedited shipping service from the UK.
Add this copy of Clara Schumann: an Artist's Life Based on Material to cart. $47.49, very good condition, Sold by Dotcom liquidators / dc1 rated 4.0 out of 5 stars, ships from Fort Worth, TX, UNITED STATES.
Add this copy of Clara Schumann Ein Kunstlerleben, 3 Vols to cart. $82.00, very good condition, Sold by T A Borden Books rated 4.0 out of 5 stars, ships from Olney, MD, UNITED STATES, published 1923 by Von Breittopf & Hartel.
Add this copy of Clara Schumann: an Artist's Life Based on Material to cart. $94.78, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Newport Coast, CA, UNITED STATES, published 2008 by Litzmann Press.
Add this copy of Clara Schumann: an Artist's Life, Based on Material to cart. $112.00, good condition, Sold by Mullen Books, Inc. ABAA / ILAB rated 4.0 out of 5 stars, ships from Marietta, PA, UNITED STATES, published 1913 by Macmillan & Co., Limited.
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Good+ (Generally clean and tight but with some age toning to page edges; ex-lib. with bookplates, pockets, and other usual markings; general wear to cloth; a few scant pencil markings throughout) Green cloth, library binding; 486 pp., 458 pp.; BW frontispiece in each volume. Translated and abridged from the fourth edition by Grace E. Hadow; Includes a preface by W. H. Hadow; A biography of the noted German composer and musician, one of the first pianists to publicly perform some of Brahms's works. Clara and her husband, composer Robert Schumann, championed Brahms in the beginning of his career.
