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The reaction of dimethylcarbonate with magnesium bis(triisopropylsilyl phosphanide) or the alkaline earth metal bis[bis(trimethylsilyl)phosphanide] in 1,2-dimethoxyethane yields the corresponding bis(2-phosphaethynolate) of magnesium (1), calcium (2), strontium (3) and barium (4). These compounds decompose upon isolation and have to be stored in an etheral solution at low temperatures. The structure...
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