Various polyfluoro-cyclic olefins have been treated with several alcohols in the presence of a base, and the ethers formed fully characterised. Each reaction, with one exception, gave two mono-alkoxy-olefins, one substituted in the vinylic position, the other in the allylic positioc, by what appears to be an addition-elimination pathway; the ratio of these ethers varied with the alcohol and olefin used. I n the characterisation of these olefinic ethers, potassium permanganate oxidation gave a number of new alkoxypolyfluorodibasic acids.View Article Online centred a t 4.5 (intensity ratio 1).Reaction of 2,2,3,3-TetrafEuoropropan-l-ol with Decafluorocyc1ohexene.-In the usual way (E 2.67 x lo3) (in ethanol).

and others found t h a t phenols condense with ethyl acetoacetate and malic acid in t h e presence of concentrated sulphuric acid to form members of t h e coumarin series. Different phenols were found to condense with varying degrees of readiness; thus phenol, 0 -and p-cresols, quinol, and thymol gave extremely poor yields (phenol furnished not more than 3 per cent. of the theoretical quantity), but resorcinol, orcinol, and pyrogallol condensed very readily. Later, Pechmann (Bey., 1899, 32, 3681) showed t h a t dimethyl-m-aminophenol condensed readily with ethyl acetoacetate, whilst t h e corresponding orthoand para-compounds yielded only traces of coumerins. Still more recently Fries and Klostermann (Bey., 1906, 39, 871) condensed m-cresol with malic acid and ethyl acetoacetate, and showed t h a t a plentiful yield was obtained in each case.

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