cm-1; nmr spectrum (CC1.) an unsymmetrical doublet of doublets centered at -6.12 (1.1 , HA °r B, Jab -5.7, /ah or bi = 2.2 cps), an unsymmetrical doublet of doublets centered at -5.68 (HBorA, /ab = 5.7, /bi or ah = 3.0 cps) overlapping with a singlet at -5.51 (H°, HD) (2.8 H total), an unsymmetrical doublet of doublets centered at -3.24 (1.0 H, HF, Jm = 7.9, /fi = 4.0 cps), a multiplet at -3.1 to -2.5 with a maximum at -2.91 (3.1 , H°, HH, Hi), a singlet at -2.15 (0.9 H, Hi), and two overlapping unsymmetrical doublets of triplets centered at -1.55
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