Abstract
Acylals (8) are produced by the reaction of benzaldehyde with methyl diphenylphosphinite (4a) and carboxylic acids. One diastereoisomer of (8) is formed almost exclusively under mild conditions; the reasons for this are discussed. α-(α-Acetoxybenzyloxy)benzyldiphenylphosphine oxide (8a) is relatively inert to methanol. Analogues of (8), the 3-acyloxy-1,3-diphenylpropylphosphine oxides (9), have been synthesised and used in assignment of structure to the acylals (8).
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