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Starting from 3‐methoxy‐1,2‐butadiene (12) both E‐ and Z‐γ‐methoxycrotylboronates 10 and 11 were prepared in isomeric purities of 85–90%. By addition of the E‐isomer 10 to aldehydes the homoallyl alcohols 5 were obtained in high diastereomeric purity. Addition to the lactaldehyde derivatives 21 unexpectedly led to the cyclopropylcarbinols 24 as main products.
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Hoffmann et al. (1985) studied this question.
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