The
reaction of ene-cyclopropenes with Cp*RuCl(cod) leads to alkenyl
bicyclo[3.1.0]hexanes, bicyclo[4.1.0]heptanes,
and bicyclo[5.1.0]octanes. This reaction involves a reverse
regioselectivity in the cyclopropene opening than with gold chlorides.
With gem-disubstituted cyclopropenes, a novel cycloisomerization
based on ring-opening nucleophilic attack and rearrangement is observed.
Alternatively, some gem-disubstituted cyclopropenes
give dimerizations of the intermediate carbene.
FINANCIACIÓNEl presente artículo forma parte del estudio realizado con la financiación del proyecto SEJ2007-672687/EDU del Ministerio de Ciencia e Innovación.
Código
RESUMENEsta investigación se centró, por una parte en la percepción de apoyo a la autonomía en las clases de Educación física, que tienen tanto el alumnado como el profesorado, y por otra, en la coherencia entre percepción y la realidad observada en las clases. Se aplicaron dos escalas al profesorado y al alumnado con el objeto de conocer con qué frecuencia se producen comportamientos instructivos favorables al desarrollo de la autonomía, y se observaron y grabaron en video clases impartidas por el profesorado. Los resultados muestran que la
Iminosugars are good starting points for the development of different kinds of drugs. Many are polyhydroxylated piperidines that behave as biomimetics of their corresponding pyranoses analogues. In the interaction with carbohydrate processing enzymes, selectivity is a crucial issue and the benefits of introducing a cyclopropane bridge in a piperidine structure is demonstrated. The synthesis of novel bicyclic piperidine-based iminosugars using a sulfur ylide cyclopropanation as the key synthetic step is described.
Benign multicystic mesothelioma is a benign tumour of unknown origin, and with a non-specific clinical manifestation. The most effective treatment is surgical, although there is a high tendency to local recurrence.
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