Benzoylferrocene photoreacts with water in scopy ; a variety of other or-carbonylferrocenes are photoreactive in these solvent systems to give products which solvents such as dimethyl sulphoxide and pyridine to yield cyclopentadienyliron benzoate and free cyclo-may also contain carboxylate groups. pentadiene identified by Lr., u.v., and n.m.r. spectro-
hlelting pcrfornrance experiments involving three different thermoplastics and three different screw designs have lieen c;irrictl o u t on a \~,cll-instriiiiiented single screw extruder eciuippcd for cold scre\v extractions. In the case of the particuwwe iised it was possible to tleduce, from meaniatlc on the extracted screw, the velocity, and lience accelcratioii, of the solid lied of coinpactetl polymer at points along the screw channel. The experiniental results are siiccessfiill>-coinpared with the performance predicted 11) ii previorisl!-estaldished niodel, the most important feature of which is thc ability to allo\v the solid lied to deform free]!, and henc,e to accelerate. The results show that the bed does indeed suffcr significant and non-uniform acceleration and that the model can predict both this acceleration and the resulting lied lireak-up which leads to surging.
A number of polycyclic aromatic thiones have been prepared from the corresponding ketones. Several of the thiones in which there is a free peri position cyclize, on excitation in the π* ← n band, to give thiophene derivatives. The structures of these were proven by application of physical methods and by desulfurization to the corresponding benzyl derivatives. The formal hydrogen 1,3 migration involved was, in one case, shown to be intermolecular by the incorporation of deuterium, from deuterium oxide, during the irradiation. In the case of the α-naphthyl derivative, the mechanism of the reaction has been investigated and it has been concluded that the n,π* singlet is the responsible entity.
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