Solubilities in the system comprising acetonitrile (1) and 1-heptene (2) have been reported in three publications over a very limited range of temperatures. Francis¹ reported the upper critical solution temperature. Kikic and Alessi ² studied the mutual solubility of (1) and (2) at 291 K by an analytical method. Pavlova et al.³ measured the upper critical solution temperature by a synthetic method. The upper critical solution temperature has been reported as 311.2 K¹ and 314.4 K,³ these data are in reasonable agreement and thus their average value: UCST = 312.8 ±1.6 K. The corresponding critical solution composition has been not reported.
Accordingly, all the available data (see the relevant data sheets) must be regarded as tentative.