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- The ratio of (3a) and (3b) was determined by glc and pmr
- pmr(CC14) δ 4.81–5.27(2H,m), 5.40–5.97(1H,m), ir(neat) v 3350, 987, 917 cm−1
- pmr(CC14) δ 2.87(3H,s), ir(neat) v 1360, 1185, 980, 920 cm−1