A complex or carbohydrate-bound acrylate and chlorotitanate determines the configuration of the Diels–Alder product of acrylate and cyclopentadiene. That (R)-2 and (S)-2 are formed in the ratio 93 : 7 can be rationalized in terms of the structure 1 for this complex.
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Kunz et al. (1987) studied this question.
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