| 释义 |
septanose Chem.|ˈsɛptənəʊz, -s|
[a. G. septanose (Micheel & Suckfüll 1933, in Ann. d. Chem. DII. 89), f. L. sept-em seven + -anose after furanose, pyranose.]
A structure containing a seven-membered ring, adopted by some sugars; a sugar having this structure. Freq. attrib. Hence ˈseptanoside, a glycoside in septanose form.
[1933Chem. Abstr. XXVII. 3453 An equil. mixt. of α- and β-2,3,4,5-tetraacetylgalactoseptanoses.] 1934Ibid. XXVIII. 1025 For an approx. 1% soln. in 0·01 N HCl of the septanoside..the half-time value of hydrolysis at 95° is about 28 min. Ibid., The 7-membered septanose ring is not strained. Ibid., Some indication of a parallelism between the instability of the free sugars (furanoses, septanoses) and the ease of hydrolysis of their glucosides. 1948R. J. McIlroy Chem. of Polysaccharides i. 4 A third type of ring, the seven membered or septanose structure has been prepared. This ring is comparable to the furanose ring in stability. It has not been obtained from natural sources. 1973Carbohydrate Res. XXVIII. 75 It is found that the pseudorotation of the septanose ring and the dioxolane rings are correlated to the position of attachment of the latter rings to the central septanose ring. 1974Jrnl. Chem. Soc.: Chem. Commun. 1010/1 Nitroethane condensed smoothly..with the hydrated dialdehyde (I) to give..the crystalline septanoside..in 38% yield. |