Trihydroxyglutaric acid

The prochirality concept is useful if it is applied to factored structures within a molecule rather than to the whole, because chiral compounds may also contain centers of prostereoisomerism that would become chiral if their homomorphic ligands were made distinct. The methylene carbons of cholesterol or C(3) of chiral trihydroxyglutaric acid (20b) are appropriate examples. 

C2 symmetry is a common feature in chiral bidentate ligands (119). If two identical enantiopure donor groups Y are connected by a tetrahedral bridging atom, any additional group Z at this atom will cause no additional stereo center but a prochiral center (Fig. 18a) (120). (S,S)- and (i2,i )-Trihydroxyglutaric acid are textbook examples for such compounds (120). Inversion of configuration at C3 in (S,S)-trihydroxyglutaric acid (Fig. 18b) yields the identical compound. 

Trihydroxyglutaric acid forms a 1 1 complex with chromium(iii) which has a stability constant of 0.9 x 10. In the presence of copper(n) a mixed complex is formed and dark bluish-green crystals of Na3[CuCrCioH70i4],5H20 have been isolated. The substituted benzoic acid complexes (60) have been prepared by heating a mixture of CrCL,6H20 and RCgH4C02H in Pr OH. The... 

Ermakov et al.422 have isolated compounds of composition Zr(C4H206)-2H20 and Zr(C5H407)-3H20 from 0.5 M ZrOCl2 solutions that were treated with one equivalent of tartaric acid or trihydroxyglutaric acid, respectively. A similar experiment with citric add gave... 

An aldopentose (A) of the D-configuration on oxidation with concentrated nitric acid gives a 2,3,4-trihydroxypentanedioic acid (a trihydroxyglutaric acid) (B) which is optically inactive. (A) on addition of HCN, hydrolysis, lactonization, and reduction gives two stereoiso-meric aldohexoses (C) and (D). (D) on oxidation affords a 2,3,4,5-tetrahydroxy-hexanedioic acid (a saccharic acid) (E) which is optically inactive. Give structures of compounds (A)-(E). 

Whether or not the stereogenic tertiary carbon atoms in isotactic and syndiotactic polypropylene are chirotopic depends on the model chosen for their representation [16]. Stereochemical analysis, which followed Natta s discovery, involved two models of the polymer chain. Stereoregular polymers were considered, on the one hand, as the extrapolation towards high molecular weights of well-studied organic molecules, e.g. such as trihydroxyglutaric acid ... 

The oxidation of D-ribose to D-ribonic acid was first carried out by Levene and Jacobs78 who used bromine in an aqueous suspension of barium carbonate as an oxidant more recent work bearing upon the oxidation of ribose to ribonic acid with alkaline hypoiodite63 and with bromine-barium benzoate has already been mentioned. More vigorous oxidation gives n o-trihydroxyglutaric acid.3... 

The case when n is odd is illustrated by trihydroxyglutaric acid (LI), for which... 

Supported stereochemical descriptors in computational software are, according to the Cahn-lngold-Prelog, (CIP) system E/Z for double bonds and R/S for asymmetric centers. Pseudoasymmetric centers are also recognized as descriptors r/s (e. g. 2,3,4-trihydroxyglutaric acid, see Fischer projection below) in ChemDraw 6.0. 

X-ray crystal structures, 397 tetrakis(perfluoroalkanesulfonates), 418 tetraphenylporphyrin, 440 thioacetylacetonato, 439 thiocyanates, 380 thioethers, 418 thiolates, 418 thiosemicarbazones, 434 thiourea, 421 tin-containing ligands, 370 trialkyIsilyloxides, 389,391 triazenes, 378 triethylamine, 371 trihydroxyglutaric acid, 412 tris(diketonates), 399 tropolonates, 402 urea, 382 water, 384... 

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