Table 1. Data Relative to the ¹H NMR of II.1.

proton	signal (ppm)	coupling constants
H2 (not equivalent)	two duplicated doublets (3.52 and 3.56)	JH2b-H2a = 10.4 Hz
		JH2b-H1 = 5.5 Hz
		JH2a-H2b = 10.4 Hz
		JH2a-H1 = 4.7 Hz
H1	split quintuplet (3.69)	JH1-H2a = 4.7 Hz
		JH1-2b = 5.5 Hz
H3	two doublets of doublets (4.01 and 4.15)	JH5a-H3a = JH5a-H3b = 1.2 Hz
		JH4-H3a = JH4-H3b = 5.6 Hz
H6	doublet of doublet of doublet (4.15)	JH8a-H6a = JH8a-H6b = 1.2 Hz
		JH8b-H6a = JH8b-H6b = 1.6 Hz
		JH7-H6a = JH7-H6b = 5.6 Hz
H5a and H8a (with H4 in cis position)	two doublets of doublets of doublets (5.15 and 5.17)	JH8a-H7 = 10.4 Hz
		JH8a-H8b = 3.07 Hz
		JH8a-H6a = JH8a-H6b = 1.2 Hz
		JH5a-H4 = 10.4 Hz
		JH5a-H5b = 3.07 Hz
		JH5a-H3a = JH5a-H3b = 1.2 Hz
H5b and H8b (with H4 in trans position)	two doublets of doublets (5.27 and 5.28)	JH5b-H4 = 17.2 Hz
		JH5b-H5a = 3.5 Hz
		JH5b-H3a = JH5b-H3b = 1.6 Hz
		JH8b-H7 = 17.2 Hz
		JH8b-H8a = 3.5 Hz
		JH8b-H6a = JH8b-H6b = 1.6 Hz
H4 and H7	two doublets of triplets (5.90 and 5.92 ppm)	JH4-H3a = JH4-H3b = 5.6 Hz; JH4-H5a = 10.4 Hz; JH4-H5b = 17.2 Hz; JH7-H6a = JH7-H6b = 5.6 Hz; JH7-H8a = 10.4 Hz; JH7-H8 = 17.2 Hz)