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Reaction of phenylacetaldehyde with catalytic amount of “Cp2M” (M = Ti, Zr) produces spectroscopically pure 5-benzyl-1, 3-dihydroxy-2, 4-diphenyl pyran as single isomer in good yield, which could be assumed formal trimerization of phenylacetaldehyde.
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Yun et al. (1998) studied this question.
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