Question
Give examples of alkoxysubstituted LAH reducing agents. Compare their selectivity with LAH.
Answer :
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Alkoxy-substituted lithium aluminium hydride reagents are modified hydride donors in which one or more hydride ligands of LAH are replaced by alkoxy groups, thereby reducing reactivity and enhancing chemoselectivity. A well-known example is lithium tri-tert-butoxyaluminium hydride, LiAlH(O-t-Bu)₃, commonly abbreviated as LTBA. Another example is lithium triethoxyaluminium hydride, LiAlH(OEt)₃, which is less sterically hindered than LTBA but still milder than LAH. Sodium bis(2-methoxyethoxy)aluminium hydride, known as Red-Al, is also an
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