An Introduction to the Study of the Compounds of Carbon, Or, Organic Chemistry (Paperback)


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. 1907 Excerpt: ...is combined is oxidized to the aldehyde group, CHO, and then phenylhydrazine reacts with this in the usual way, giving a product of the formula--CH20H. CHOH. CHOH. CHOH. C. CH II II C6H5HNSr N.NHC6H5. This is the osazone of fructose or fructosazone. Glucosazone and fructosazone are identical. The osazones are in general difficultly soluble in water and have characteristic properties whereby they can be recognized. The sugars themselves are easily soluble and it is hard to separate them, and until the discovery of the phenylhydrazine reaction the investigation of the sugars advanced very slowly. This reaction in the hands of one of the most skilful experimenters has advanced our knowledge of the sugar group enormously within a few years past. The formation of the osazones makes it possible to recognize the different sugars, but it does not give the sugars themselves. The regeneration of the sugars from the osazones is of great importance. The principal reactions available for this purpose are the following: --1. The osazone is heated for a short time with fuming hydrochloric acid when it yields phenylhydrazine hydrochloride and an osone, thus: --CH2OH. (CHOH)3. C. C ] 2 H20 + 2 HC1 II II C6H5HN.N N.NHC6H5 = CH2OH(CHOH)3CO. CHO + 2 C6H5. NH. NH2. HC1. Osone. 2. The osone can be isolated and reduced by means of acetic acid and zinc dust, when it is converted into the corresponding ketose: --CH2OH(CHOH)3CO. CHO + 2 H = CH2OH(CHOH)3. CO. CH2OH. Whether the original sugar was an aldose or a ketose, the final product of the above series of reactions is a ketose. The aldoses cannot, therefore, be regenerated in this way. On the other hand, any aldose can be converted into a ketose by this means. Mannose, C6H12Oe.--(Z-Mannose is one of the products of oxidation of d-ma

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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. 1907 Excerpt: ...is combined is oxidized to the aldehyde group, CHO, and then phenylhydrazine reacts with this in the usual way, giving a product of the formula--CH20H. CHOH. CHOH. CHOH. C. CH II II C6H5HNSr N.NHC6H5. This is the osazone of fructose or fructosazone. Glucosazone and fructosazone are identical. The osazones are in general difficultly soluble in water and have characteristic properties whereby they can be recognized. The sugars themselves are easily soluble and it is hard to separate them, and until the discovery of the phenylhydrazine reaction the investigation of the sugars advanced very slowly. This reaction in the hands of one of the most skilful experimenters has advanced our knowledge of the sugar group enormously within a few years past. The formation of the osazones makes it possible to recognize the different sugars, but it does not give the sugars themselves. The regeneration of the sugars from the osazones is of great importance. The principal reactions available for this purpose are the following: --1. The osazone is heated for a short time with fuming hydrochloric acid when it yields phenylhydrazine hydrochloride and an osone, thus: --CH2OH. (CHOH)3. C. C ] 2 H20 + 2 HC1 II II C6H5HN.N N.NHC6H5 = CH2OH(CHOH)3CO. CHO + 2 C6H5. NH. NH2. HC1. Osone. 2. The osone can be isolated and reduced by means of acetic acid and zinc dust, when it is converted into the corresponding ketose: --CH2OH(CHOH)3CO. CHO + 2 H = CH2OH(CHOH)3. CO. CH2OH. Whether the original sugar was an aldose or a ketose, the final product of the above series of reactions is a ketose. The aldoses cannot, therefore, be regenerated in this way. On the other hand, any aldose can be converted into a ketose by this means. Mannose, C6H12Oe.--(Z-Mannose is one of the products of oxidation of d-ma

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Product Details

General

Imprint

Rarebooksclub.com

Country of origin

United States

Release date

May 2012

Availability

Supplier out of stock. If you add this item to your wish list we will let you know when it becomes available.

First published

2010

Authors

Dimensions

246 x 189 x 6mm (L x W x T)

Format

Paperback - Trade

Pages

110

ISBN-13

978-1-152-34387-0

Barcode

9781152343870

Categories

LSN

1-152-34387-4



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