... European Journal of Organic Chemistry. ... Table 1. 1 H NMR spectroscopic data for 3-substituted cyclopenta[c]pyrans in CDCl 3 (16–19, 21, 22), [D 8 ]THF (15) or [D 6 ]acetone (23); chemical shifts (δ) are given in ppm [δ(CHCl 3 ) = 7.26 ppm, δ(OCHD of [D 8 ]THF) = 3.58 ppm ... [d] ...