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Home > History and Archaeology > History > Monographs Volume 16-20: (English)
Monographs Volume 16-20: (English)

Monographs Volume 16-20: (English)

          
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About the Book

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1922 Excerpt: ...The yield was 344 gm. The 344 gm. of heptonic acid were dissolved in 800 cc. of hot water, and 391 gm. of crystals were obtained. The rotation in 2.5 per cent UCl solution was Initial. Final (24 hrs.)..-0.33 X 100 0O, --0.49 X 100 al-fxl 8 a" Tx4 12 These crystals were dissolved again in 800 cc. of hot water, and 265 gm. of crystals were obtained which had the same rotation in 2.5 per cent HC1 solution. Initial. Final (24 hrs.).., --0.33 X 100 o ., --0.52 X 100 17 . a"--fxi 8 al--na 13 In the mother liquor a further deposit of the same substance settled out. The total yield of levo-d-chondrosaminoheptonic acid was 313 gm. It crystallized out of water in elongated prisms. The melting point was 139C. (corrected) with decomposition. Dextro-d-Chondrosaminoheptonic Acid.--The mother liquor of the first crystallization was concentrated under diminished pressure and a precipitate formed which was filtered off. To the filtrate an equal volume of 95 per cent alcohol was added and the solution was allowed to stand for 24 hours. A second precipitate formed and was filtered off again and the solution was poured into absolute alcohol under constant stirring. A gummy precipitate formed which was removed and the solution was concentrated to a syrup under diminished pressure at room temperature. Alcohol was then added and the solution allowed to stand for several days. Crystals separated which had the following rotation in 2.5 per cent HC1 solution: Initial. Final (24 hrs.). No. 351..- +0.64 X 100, ., .., - +1.02 X 100, -1d-"+16 aD = = +25 The yield was 1.9 gm. In the mother liquor a second deposit of 2.3 gm. of crystals formed which had the following rotation in 2.5 per cent HC1 solution: Initial Final (24 hrs.)....


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Product Details
  • ISBN-13: 9781130772616
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 136
  • Series Title: English
  • Weight: 254 gr
  • ISBN-10: 1130772616
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 7 mm
  • Width: 189 mm

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