Claudine Pascard-Billy

18-Crown-6–potassium–ethyl acetoacetate enolate. X-Ray structure determination

The crystal structure of the title compound shows that it forms a distinct molecule; K+ is co-ordinated to the six oxygen atoms of the crown and to the two oxygen atoms of the U shaped enolate.

X-Ray structure of the androsta-14,16-diene–maleic anhydride adduct

The Diels-Alder reaction of the reactive androsta-14,16-diene with maleic anhydride has been shown to be a β-attack of the D ring of the molecule.

X-Ray structure of mascaroside, a new bitter glycoside from coffee beans

The structure of mascaroside, a bitter glycoside from Coffea vianneyi, has been shown by spectroscopic methods and X-ray analysis to be a diterpene, of the (–)-kaurene type with a β-glucose unit attached to C-17.

Crystal and molecular structure of emericid: a new polyether antibiotic

The molecular structure of the antibiotic emericid has been established from the crystal structure of its silver salt.

Synthesis and stereochemical correlation of acyclic sugar nucleoside analogues: X-ray crystal structure of (1R)-2,3,4,5-tetra-O-acetyl-1-S-ethyl-1-(1,6-dihydro-6-thioxopurin-9-yl)-1-thio-D-arabinitol

A crystal structure determination has been used to establish the absolute stereochemistry of a mixed acetal derivative, a nucleoside analogue (1) having purine-6-thione (‘6-mercaptopurine’) attached to an acyclic D-arabinose derivative.

Synthesis and X-ray crystallographic studies of dithiepan derivatives of carbohydrates

Nucleophilic addition of 2-lithio-2-methyl-1,3-dithian to the dialdehyde (2) gives the two diastereo-isomers (3) and (7) was transformed into a new class of carbohydrate dithiepan derivatives (11)–(13).

X-Ray crystal and molecular structure of pollinastanol acetate, a 9,19-cyclopropane steroid

The structure of pollinastanol acetate has been elucidated by direct method X-ray crystal structure analysis; it is the acetate of 14α-methyl-9β,19-cyclo-5α-cholestan-3β-ol (I).