Patent ID: 8404872

Claim:
A method for preparing a compound having the structure comprising the step of effecting rearrangement of using a catalyst selected from the group consisting of and mixtures thereof, where R′ 1 , R′ 2 , R′ 3 , R′ 4 and R′ 5 are the same or different and are independently selected from the group consisting of hydrogen; C 1 -C 8 alkyl which is unsubstituted or substituted with one or more of halogen or C 6 -C 20 aryl; trifluoromethyl; and phenyl which is unsubstituted or substituted at the 4-position with fluoro, trifluoromethyl, C 1 -C 8 alkyl or C 6 -C 20 aryl; and n is 2, where X is selected from the group consisting of O, S and NR where R is a protecting group or other group that accommodates for N having a valence of 3, and where R 1 , R 2 , R 3 , R 4 , R 5 and R 6 are the same or different and are independently selected from the group consisting of hydrogen, C 1 -C 8 alkyl, carbocyclic aryl group having 6 to 10 carbon atoms, heterocyclic aryl group having 6 to 10 carbon atoms, and halogen, and two or more of R 1 , R 2 , R 3 , R 4 , R 5 and R 6 can be bonded together to form a ring or rings.