Air stable (cyclopentadienyl)Mo(NO)(halide)[η3-(Z)-crotyl] complexes add to aldehydes with high diastereoselectivity to yield syn-β-methyl homoallyl alcohols in up to 98% de. New routes to these reactive metal-(Z)-crotyl reagents utilize 2-butyne and s-cis-butadiene organomolybdenum intermediates instead of (Z)-crotylpotassium.
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Faller et al. (1991) studied this question.
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