in order to know the fauna of the mealybugsassociated to ornamental plants, samplings were carried out in gardens, avenues, parks and nurseries in different regions of the country. the frequency of such species collected was determined, and cluster analysis by ward method and euclidiana distance...
Abstract The N-(p-nitrophenoxy-carbonyl) and N-(phenylthio-carbonyl) derivatives of α- amino-acyl-hydrazides cyclize in presence of diazomethane, yielding hexahydro-1, 2, 4- triazines with simultaneous formation of p-nitro-anisole or thio-anisole r
Moreover, the chorological knowledge of two iberian endemics: Cheilosia limbicomis (Strobl, 1909) and Pipizella lyneborgi Torp-Pedersen, 1971 and two rare syrphids in Spain: Didea fasciata Macquart,1834 and Cheilosia longula (Zetterstedt, 1838) is extended. Some new data on the pollinical...
Substituted cyclobutanones have been obtained from the corresponding 1,3-diones by converting one oxo group in the latter compounds into sulfur containing group(s) and subsequently removing the S group(s) with Raney-Nickel. The mass spectral fragmentation patterns of these compounds are discussed....
The p-nitrophenoxycarbonyl derivatives give rise to the same cyclisations in the presence of pyridine by the intermediate of carbamyle-pyridinium ion acting as electrophile.doi:10.1002/hlca.19690520129Baudet PCalin MWILEY‐VCH Verlag GmbHHelvetica Chimica Acta...
An important step in a new synthesis of phenylcyclohexylamines, the conversion of 1-phenylcyclohexanols into the corresponding azides, is studied in some detail. The slow epimerization of the azides allows isolation of both the kinetic and the thermodynamic products. From the chemical behaviour of ...