2:2 instead of 3:1 is the ratio between the lithium anisylfencholate 1 and the nBuLi units in the aggregate formed from these components (see structure) when the substituent is changed from X=H to X=SiMe3. DFT calculations confirm the different stability sequences of the 2:2 and 3:1 aggregates with the two different X substituents. The 2:2 aggregate gives a higher enantioselectivity (80 % ee) than the 3:1 aggregate in the nBuLi addition to benzaldehyde.
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Goldfuß et al. (2000) studied this question.
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