Study of the cyclization of phenyl allylic cations

Bibliography: p. 126-128

Gas phase reactions of protonated 1,3-diphenylpropyne and some isomeric [C15H13]+ ions

Bäther W, Kuck D, Grützmacher H-F. Gas phase reactions of protonated 1,3-diphenylpropyne and some isomeric [C15H13]+ ions. Organic Mass Spectrometry. 1985;20(9):572-577.Metastable (3-phenyl-2-propynyl)benzenium ions, generated by electron impact induced fragmentation from the appropriately substituted 1,4-dihydrobenzoic acid, react by loss of ·CH3 and C6H6. The study of deuterated derivatives reveals that hydrogen/deuterium exchanges involving all hydrogen and deuterium atoms precede the fragmentations. The results suggest a skeletal rearrangement by electrophilic ring-closure reactions giving rise to protonated phenylindene and protonated 9,10-methano-9,10-dihydroanthracene prior to the elimination of C6H6 and ·CH3, respectively. A study of isomeric [C15H13]+ ions by collision-induced decomposition and by deuterium labelling shows that these ions interconvert by hydrogen migrations and skeletal rearrangements

<b>Seasonal energy stores in a key marine grazer</b>

This is the data set in the published paper by Dytnerski et al. on the seasonal metabolic physiology, feeding and energy stores of the sea urchin Diadema setosum in Hong Kong. It includes environmental quality data, field survey data for the abundance (numbers and biomass) of marine algae, seasonal metabolic rates, size, gonad weight, and gonad lipid stores of D. setosum.</p