Science of Synthesis

Ito, T.; Minato, M., Science of Synthesis, (2003) 2, 375.

Sodium reductions of M(CO)6 in hexamethylphosphoric triamide provide a facile and clean route to Na2[M(CO)5],[‌194‌,‌195‌] although hexamethylphosphoric triamide is one of the strongest donor solvents known[‌196‌] and efforts to completely remove it from these salts have been unsuccessful.[‌197‌] Because of this difficulty of removing hexamethylphosphoric triamide, unsolvated disodium pentacarbonylchromate(−II) is prepared in liquid ammonia (‌Scheme 63‌).[‌197‌,‌198‌]

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References