Beilstein J. Org. Chem.2005,1, No. 4, doi:10.1186/1860-5397-1-4
reacted much more reversibly as evidenced by the higher trans selectivity (96: 4), the C2 control was similar (84:16) (8a+8c: 8b) to the reaction under kineticcontrol (Table 1, entry 2). This indicated that the rate of bond rotation or the rate of the ring closure of the two anti betaines (k5 and k7 or