Crystal structure alcohols

Precipitated K—salt crystals are carefully filtrated and washed so as to separate them from the mother solution. Drying of filtrated K-salt is also a very delicate and important process that must be performed under conditions that avoid hydrolysis of the material. Potassium heptafluorotantalate is sensitive to water, basic compounds and alcohols, especially at elevated temperatures. The main product of K-salt hydrolysis is Marignac s salt. For a long time it was believed that the composition of Marignac s salt is K/Ta Fg. However, X-ray crystal structure analysis and precise chemical analysis of the... 

Rawlings and Lingafelter [69] studied the hydrated phases of sodium alcohol sulfates ranging from C6 to C20 and their crystal structures by X rays. The a phase is almost identical to that of the alkylsulfonates but all other phases are different. The crystals of all phases are monoclinic. This work was completed by Prins and Prins [70] who gave more precise details of the polymorphism of sodium alcohol sulfates. 

The Krafft temperature for a homologous series rises as the chain length increases but with independent and different curves for even or odd members [80]. Figure 7 shows the Krafft temperatures of sodium alcohol sulfates ranging from 11 to 18 carbon atoms where the two different curves for odd- and even-numbered series and the alternancy of values can be clearly observed. Lange and Schwuger explain this effect as caused by the different crystal structures of the even and odd numbers. 

The crystal structure of the HNL isolated from S. bicolor (SbHNL) was determined in a complex with the inhibitor benzoic acid." The folding pattern of SbHNL is similar to that of wheat serine carboxypeptidase (CP-WII)" and alcohol dehydrogenase." A unique two-amino acid deletion in SbHNL, however, is forcing the putative active site residues away from the hydrolase binding site toward a small hydrophobic cleft, thereby defining a completely different active site architecture where the triad of a carboxypeptidase is missing. 

Al-Karadaghi S, Cedergren-Zeppezauert ES, HovmoUer S. 1994. Refined crystal structure of liver alcohol dehydrogenase-NADH complex at 1.8 A resolution. Acta Crystallogr DSO 793 - 807. 

Oubrie A, Rozeboom HJ, Kalk KH, Huizinga EG, Dijkstra BW. 2002. Crystal structure of qui-nohemoprotein alcohol dehydrogenase from Comamonas testosteroni Structural basis for substrate oxidation and electron transfer. J Biol Chem 211 3727-3732. 

The crystal structure of (232) is reported. Ir complexes bound to the multidentate ligand as in (232) have proved successful in the enantioselective reduction of a,/3-unsaturated ketones to allylic alcohols.404... 

The late stages of the synthesis (Scheme 1.17) proceeded with Wittig methylenation of ketone 144 with Ph3P=CH2 at 70 °C to furnish exocyclic alkene 145 in 77 % yield. Finally, the alcohol was installed via a Se02-mediated allylic hydroxylation [57] of the exocyclic alkene 145 to afford ( )-nominine (1) in 66 % and 7 1 dr. The structure of nominine (1) was verified via an X-ray crystal structure determination, thereby completing the racemic total synthesis of ( )-nominine (1). 

Similarly, dilithiation of 2-(4-bromophenoxy(ethanol in the presence of magnesium 2-ethoxyethoxide followed by reaction with 0.5 equiv. of HgCl2 afforded the corresponding diarylmercury compound 4-(H0(CH2)20)-C6H4)2Hg 26 whose crystal structure has been determined (Equation (12)).47 In addition to these alcohol and ether derivatives, thio- and phosphinoaryl mercury compounds have also been prepared. Thus, the dilithium salt... 

A. Oubrie, H.J. Rozeboom, K.H. Kalk, E.G. Huizinga, and B.W. Dijkstra, Crystal structure of qui-nohemoprotein alcohol dehydrogenase from Comamonas testosteroni. J. Biol. Chem. Til, 3727-3732 (2002). 

UV absorption maxima occur at 236, 274 and 316 nm. The molecular formula of zearalenone is C18H22Os, its molecular weight is 318.4 g/mol and its melting point is 162-163°C (Blackwell et al. 1985 Josephs et al. 2003). The maximum fluorescence in ethanol occurs with irradiation at 314 nm and with emission at 450 nm. Its solubility in water is about 0.002 g/100 ml. In an aqueous solution of inositol, the presence of zearalenone can change the crystal structure of this alcohol, which indicates the possibility of interaction between both substances (our observations). Moreover, zearalenone is slightly soluble in hexane and progressively more so in benzene, acetonitrile, methylene chloride, methanol, ethanol and acetone. However, it is readily soluble in aqueous alkali. 

Per-O-acylated glycosyl iodides are stable at room temperature and can be purified on a silica gel column and stored at 0 °C. Stachulski and coworkers [202] synthesized methyl 2,3,4-tri-O-pivaloyl-glucopyranuroate iodide, which is a stable solid at 20 °C and can be stored for months at room temperature or for more than a year at 0 °C. The X-ray crystal structure of this compound, the first one of this class, shows a typical chair structure. Importantly, such a disarmed and stable iodide can be coupled with primary and secondary steroidal alcohols using I2 as a promoter, as demonstrated by the synthesis of morphine-6-glucuronide, an analgesic [202], The glycosyl donor ability... 

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