| 11. | As a Lewis acid, GaCl 3 is milder than aluminium trichloride.
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| 12. | Common Lewis acids include aluminium chloride, ferric chloride and boron trifluoride.
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| 13. | Tin acts as the Lewis acid, and gives the transesterified product.
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| 14. | Other boron Lewis acids include BF 3 and BCl 3.
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| 15. | Stibanes are weak Lewis acids and therefore ate complexes are not encountered.
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| 16. | I don't think nucleophilic or Lewis acid catalysis is involved.
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| 17. | Conversely, many Lewis acids are not Arrhenius or Br�nsted-Lowry acids.
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| 18. | The reaction can be achieved using triethylsilane with a variety of Lewis acids.
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| 19. | They are also referred to in the chemistry of Lewis acids and bases.
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| 20. | HfCl 4 is an effective Lewis acid for various applications in organic synthesis.
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