The fact that DMCB does not close to a cyclobutene makes it a unique cisoid diene. Aue9 has suggested that ring strain plays an important role here. It should be noted that this interesting olefin has been prepared by

Abstract:We report on the in-situ synthesis of metal carbonyl complexes with short-lived isotopes of transition metals. Complexes of molybdenum, technetium, ruthenium and rhodium were synthesized by thermalisation of products of neutron-induced fission of 249 Cf in a carbon monoxide-nitrogen mixture. Complexes of tungsten, rhenium, osmium, and iridium were synthesized by thermalizing short-lived isotopes produced in 24 Mg-induced fusion evaporation reactions in a carbon monoxide containing atmosphere. The chemical reactions took place at ambient temperature and pressure conditions. The complexes were rapidly transported in a gas stream to collection setups or gas phase chromatography devices. was studied. We also studied the stability of some of the complexes, showing that these start to decompose at temperatures above 300 ∘ C in contact with a quartz surface.Our studies lay a basis for the investigation of such complexes with transactinides.

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Philodiene wie Derivate des Maleinsaurcanhydrids oder Inden und cyclische Diene wie Furan lassen sich durch photosensibilisierte Cyclo-Addition nach dem Prinzip der rein biradikalischen Substrat-Ubertragung zu Cyclobutanderivaten vereinigen.Die photosensibilisierten Cyclodimerisationen des Cumarins 1) und des Acenaphthylens 2.3) sind rein x-addierende Dimerisationen von Philodienen wie A und B, die nach dem Prinzip der photosensibilisierten Substrat-&xtragung4) zu Cyclobutanderivaten AB fuhren.

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