STORRE

Many compounds of alleged dried frult-llke aroma have been prepared with a view to a structure-activity relationship (S.A.R.) analysis of dried fruit odorants. Of the oxaspiro[2,5]octane type compounds, all the diastereoisomers of ethyl 4,4,7-trimethyl-2- (1-oxaspiro[2,5]octyl)carboxylate were prepared. The glycidate esters, derived from the Darzens condensation of α-ionone with methyl and ethyl chloroacetate, were also prepared. Megastigma-5,7-(E),9-trien-4-one was synthesised from β-ionone...

The discussion of the research reported in this thesis is prefaced by a review on diazoalkane chemistry. The initial object of this work was to continue and expand upon the work previously reported on thiophenium ylids. 3-Substituted thiophenium ylids had not previously been synthesized. Attempts to synthesize these compounds using reported conditions met with limited success, only low yields of the desired ylids were obtained. The use of rhodium-(II)-hexanoate as a catalyst in the ylid fo...

A 1-keV metastable atomic deuterium [D(2S)] beam of density about 104 atoms cm-3 has been produced by charge-exchange, in caesium vapour, of deuterons extracted from a radio-frequency ion source. The linear and circular polarisation correlation of the two photons emitted spontaneously by metastable atomic deuterium in a true second order radiative process have been measured for the first time. While the circular polarisation results confirm the conservation of angular momentum along the commo...

The African Elephant Specialist Group (AfESG) of IUCN will now treat African elephants as two species: the forest elephant Loxodonta cyclotis and the savannah elephant Loxodonta africana. This will be reflected in IUCN's Red List assessment update for African elephants, and in the next iteration of the African Elephant Status Report, both to be published in 2021. This concurs with Wilson & Reader (Mammal Species of the World, 2005), the primary IUCN reference on mammalian taxonomy, Wittemyer ...