New paradigms in cycloaddition face-selectivities: remarkable effect of remote substituents in singlet oxygen addition to hexacyclo[7.5.1.01,6.06,13.08,12.010,14]pentadeca-2,4-diene system
Goverdhan
Mehta
,
R.
Uma
,
M.
N. Jagadeesh
and
Jayaraman
Chandrasekhar