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Category:Indian filmsThe present invention relates to a novel.beta.-amino-2-keto-3-deoxy-D-gluconic acid (hereinafter abbreviated as ".beta.-NADG") as a novel material useful for organic chemical synthesis.
A racemic form of.beta.-NADG (NAD.sub.G) which has an optical configuration of [1.alpha.-D-glucopyranosyl].sub.2 -D-mannopyranose is known to be a useful intermediate for the synthesis of natural and unnatural.beta.-amino acids (See Japanese Patent Publication No. 19612/1978).
Several methods for the asymmetric synthesis of.beta.-NADG have been proposed in the prior art.
The asymmetric synthesis of.beta.-NADG by a coupling reaction between a chiral cyclic amino acid and aldonic acid to form.beta.-NADG has been disclosed in Japanese Patent Application Laid-open No. 121845/1981.
In the aforementioned method, the chiral cyclic amino acid is first introduced into an aldonic acid through a transesterification reaction to form a cyclic.beta.-NADG. The formed cyclic.beta.-NADG is then desymmetrically rearranged through a condensation reaction to form.beta.-NADG.
The above coupling reaction, however, is strongly hindered by an acetyl group of the aldonic acid and it is difficult to achieve a high yield. Therefore, it has been required to remove the acetyl group from the aldonic acid prior to the coupling reaction.
It is also known that an aldonic acid having an ester group may be prepared by transesterification of its corresponding diol with an alkali metal acetate, followed by reduction of the transesterified diol with hydrogen gas to form the aldonic acid having the ester group. As disclosed in Japanese Patent Publication No. 9806/1968, such a process is usually carried out in the presence of a ruthenium catalyst. However, the 01e38acffe
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Contributions and edits after this date are copyright of their respective authors, and not the copyright of the IntermittentFiction wiki.Q:
How to center and resize my PNG and transparent images?
I want to resize my image and make it centered in a div. My code is:
.small-6 {
-ms-grid-row: 6;
-ms-grid-column: 6;
-ms-grid-row-span: 2;
-ms-grid-column-span: 2;
}
.small-4 {
-ms-grid-row: 4;
-ms-grid-column: 4;
-ms-grid-row-span: 2;
-ms-grid-column-span: 2;
}
.small-2 {
-ms-grid-row: 2;
-ms-grid-column: 2;
-ms-grid-row-span: 2;
-ms-grid-column-span: 2;
}
but it doesn't work. My site:
A:
Try this:
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