The title compound, C13H10F3NO2, (I) and its ethyl derivative, C15H14F
3NO2, (II), are trifluoromethyl-coumarin derivatives of the 6,7,8,9-te
trahydro-2H-pyrano[3,2-g]quinolin-2-one moiety, Compound (I) is stabil
ized by one C-F ... H and two C-O ... H intermolecular hydrogen bonds.
Compound (II) crystallizes with two molecules in the asymmetric unit
and is stabilized by van der Waals intermolecular interactions, The in
dependent molecules in (II) are stacked in parallel layers in an alter
nating sequence, with the coumarin moieties forming an angle of 76.5 (
4)degrees between adjacent parallel stacks.