Structure of 2,2-bis(trifluoromethyl)-7,7-bis(trifluoromethyl)-hydroxymethyl-1,3,6-trioxaspiro [4.4]non-8-ene

The chemical structure of the unusual condensation product of hexafluoroacetone with 2-hydroxymethylfuran, namely 2,2-bis(trifluoromethyl)-7,7-bis(trifluoromethyl) hydroxymethyl-1,3,6-trioxaspira[4.4]non-8-ene, has been unequivocally established by x-ray structural analysis. The spiroannelated dihydrofuran and dioxalane heterocycles exist in flattened envelope and envelope conformations, respectively. An intramolecular unsymmetrical, bifurcated H-bond is also present

Structure of 16α,17α-(Acetylepimino)Pregnenolone 3-Acetate in the Crystal and in Solution

Conclusions The structure of 16α,17α-(acetylepimino)pregnenolone 3-acetate in the crystal and in solution has been investigated. The conformation of the 17β-acetyl group scarcely changes on passing from the crystalline state into solution

Structure of 1,1-di(tert-butylperoxy)cyclohexane

From the example of 1,1-di(tert-butylperoxy)cyclohexane it was shown that not only intramolecular steric interactions (the type of substituent at the O-O bond) but also the influence of crystal field forces have a substantial effect on the conformation of the peroxide group in the crystals of peroxyketals of cyclanes

Structure and Conformational Flexibility of Hexamethyldiperoxacyclononane

3,3,6,6,9,9-Hexamethyl-1,2,4,5-tetraoxacyclononane, one of the most thermally stable organic peroxides, has been studied by X-ray structural analysis. Possible conformations of this compound have been calculated by the molecular mechanics method

Nontrivial Intramolecular Interaction in Ozonation of Dimethyl Ester of endo,cis-bicyclo[2,2,1]hept-5-en-2,3-dicarbonic acid in diethyl ether

The formation of the product of intramolecular interaction of a zwitterion and a methoxycarbonyl group was observed in the process of ozonating dimethyl ester of endo,cis-bicyclo [2,2,1]hept-5-en-2,3-dicarbonic acid in diethyl ether. The structure of racemic endo,cis-4-methoxy-5-methoxycarbonyl-6-formyl-1,4-epoxy-2,3-dioxacyclopenta[2,3-δ] cyclohexane was established by an X-ray structure analysis

Substituent Effects on the Nature of Hydrogen Bonding in Organic Hydroperoxides and the Structure of Triphenylmethyl Hydroperoxide

It has been found that in the crystalline state in triphenylmethyl hydroperoxide the hydroperoxy group is involved in intermolecular hydrogen-bond formation of the type O-h...π, with one C...C π-bond in a benzene ring. Conformational analysis and comparison with the results of x-ray structural analysis leads us to conclude that there are very narrow limits on the possible conformations of the COOH group in tert-butyl, cumyl, 1,1-diphenylethyl, and triphenylmethyl hydroperoxides, independent of their aggregation state or the nature of the substituent attached to the COOH group