Triphenoxy borate ester

Yasuda and Baba recently reported a cage-shaped borate ester (165) and its tetrahydrofuran (THE) adduct, (166) (Figure 5.10) [100]. Compound (165) is more Lewis acidic compared to the planar triphenoxy borate ester (167). 

In (165), the dihedral angle C-O-B-O is 48.4° compared to 2.0° found in planar triaryloxy borate ester (167), and as a consequence, there is less efficient orbital overlap in (165) compared to triphenoxy borate ester (167) Figure 5.11 [100]. 

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See also in sourсe #XX -- [ ]

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