M. P. Koroteev

Structure of ammonium salts of 2-oxy-1,4-butylene-and 2-oxy-1,5-amylenephosphoric acids

The structures of dioxaphosphepane (I) and dioxaphosphecane (II) salts prepared by hydrolysis of the corresponding bicyclophosphates have been compared. In both cases, hydrolysis occurs with breaking of the P−O bond of the fragment at the secondary carbon atom of bicyclophosphate. In phosphocycles I and II, the endocyclic bond angles O−P−O are 104.2 and 104.9°, and the exocyclic ones are 117.7 and 118.6°, respectively. Conformations of the anions in I and II differ substantially: for I it is a “twist” conformationC1TC4, and for II a “distorted armchair.” The data obtained are compared with those found earlier for similar molecules.

Molecular structures of 3,5,6-bicyclothiophosphates and 3,5,6-bicycloselenophosphates of 1,2-O-isopropylidene-α-D-glucofuranose

An x-ray diffraction structural analysis was carried out for the 3,5,6-bicyclothiophosphate and 3,5,6-bicycloselenophosphate of 1,2-O-isopropylidene-α-D-glucopyranose. The colorless, orthorhombic crystals are nonisometric. The O-P-O bond angles at pentavalent phosphorus vary from 97.6–105.1°, i.e., the phospholane-phosphorinane fragment in these molecules is highly strained. All the bond lengths in these molecules have ordinary values.

3,5-CYCLOPHOSPHITES OF 6-DEOXY-1,2-O-ISOPROPYLIDENE-α-D-GLUCOFURANOSE

Die Glucofuranose (I) wird in einige cyclische Derivate mit drei- und funffach koordiniertem Phosphor ubergefuhrt.