The centrosymmetric title compound, C(18)H(26)O(4), was prepared in high yield from 4-acetoxy-styrene via Ru-catalysed homo-olefin metathesis. Exclusive formation of the E-configurated isomer was observed. In the crystal, a strong C-H⋯π inter-molecular inter-action links the mol-ecules together.

Vaucheriaxanthin is 19'-OH and not 19-OH neoxanthin. This structural conclusion was borne out by mass, PMR and infrared (IR) spectra from the free pigment and its derivatives (vaucheriaxanthal, vaucheriaxanthal-diacetate, vaucheriaxanthal-diacetate-mono (trimethylsilyl) -ether, vaucheriaxanthintriacetateand triacetate-monosilanate, vaucheriaxanthin-dimethylether) and by comparison of the charac...

1 Department of Neurosurgery, Johns Hopkins University, Baltimore, Maryland, United States of America, 2 Krieger Mind/Brain Institute, Johns Hopkins University, Baltimore, Maryland, United States of America, 3 Department of Neuroscience, Johns Hopkins University, Baltimore, Maryland, United States of America, 4 Department of Biomedical Engineering, Johns Hopkins University, Baltimore, Maryland,...

The objective of this study was to determine the antimicrobial effect of a combination of potassium lactate and sodium diacetate (0, 1.8, 3, and 4.5%; PURASAL P Opti. Form 4, 60% solution) on the survival and growth of Listeria monocytogenes Scott A in pH-adjusted broth (5.5, 6.0, 6.5, and 7.0) stored at 4, 10, 17, 24, 30, and 37 degrees C. Appropriate dilutions of broth were enumerated by spir...

The conversion of readily available silylalkynes, iodobenzene diacetate, and azide anions was utilized to form and react cyanocarbenes. A copper(II)-catalyzed reaction was found to react in a different manner. Both of these methods benefit from the formation and in situ reaction of hypervalent iodonium alkynyl triflates in O-H insertion reactions.

THE STRUCTURE OF THE TITLE STEROID [ALTERNATIVE NAME: 3β,6β-diacet-oxy-5β-methyl-19-norcholest-9(10)-ene], C31H50O4, confirms the generally accepted mechanism for the rearrangement of a cholestan-5α-ol derivative reported a century ago by Westphalen. The methyl group at position 10 of the starting material migrates to position 5 in the steroidal nucleus, while a Δ(9) bond is formed, as indicate...