Abstract
We found that pyridinium perchlorate is extremely active catalyst for phosphonylation of various C=X electrophiles, namely aldehydes, ketones, aldimines, ketimines, isocyanates, and others by trialkylphosphites, to give the corresponding α-substituted phosphonates in high yields. The reaction was carried out solvent-free or in methylene chloride at room temperature or at cooling to 0 о С. In the presence of
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