... 0002-7863/86/ 1508-0647$01.50/0 0 1986 American Chemical Society ... and trans-2-hexene (GR grade) from Nakarai Chemicals, trans-2- pentene (GR grade) from Wako Pure Chemical Industries, methyl cis- 9 ... Diphenyl sulfide (GR grade) was obtained from Nakarai Chemicals. ...