The synthesis of 1-(2,6,6-trimethyl-1-cyclohexen-1-yl)-18-(2,6,6-trimethyl-2-cyclohexen-1-ylidene)-3,7,12,16,-tetramethyl-2,4,5,8,10,12,14,16,18-octadecanonaene and its rearrangement to trans-beta-carotene.

作者： Joseph D. Surmatis , J. Gibas , R. Thommen