11 formed by prototropic rearrangement of 1 or 2. However, such a mechanism seems untenable because 3-isopropoxycyclohexene (12), 4 bp 79 (92 mm.), nZ4D 1.4448 (from 3- bromocyclohexene and isopropyl alcohol), is not converted to l-isopropoxycyclohexene (13) under the reaction conditions. 13 Note that failure to observe conversion of a 3- alkoxycyclohaxene to a 1-alkoxycyclohexene is not the result of an equilibrium that favors ...