Compoundsof the type RIEH react readily with CF3C=CCF3 togive R?EC(CF3)=C(CF3)H (E = N, P, As), and with CFIC-CH togive R?ECH=CHCF3 (E = N, As) and R?EC(CF,)= CH? (E = As). The isomer distribution of the products IS obta~ned from their n.m.r. soectra and the mechanism of the addition reaction is discussed.

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Volumes and heats of mixing are reported for equimolar mixtures of benzyl acetate with acetone, pyridine, dioxan, nitromethane, aniline, chloroform and rn-cresol. Volumes and heats of mixing have been obtained for a range of concentrations for those systems which evolve heat. The results are discussed in terms of the theories of solutions of nonelectrolytes.

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