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HMPA was dried from CaO and then distilled at 80¡ãC (1mmHg) from calcium hydride.¡ª¡ªÕª×ÔMeyer C, Marek I, Courtemanche G, et al. Intramolecular carbometallation of organozinc reagents[J]. Tetrahedron, 1994, 50(40): 11665-11692.
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