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The reaction of H2C(PCl2)2 with four equivalents of iPrMgCl produces H2C(PiPr2)2, which was treated with tellurium in boiling toluene, or selenium in toluene at room temperature, to give the monochalcogenides EPiPr2CH2PiPr2 (E = Te, 4a; E = Se, 4b) in high yields. X‐ray structural determinations show that 4a and 4b exist as the CH2 tautomers in the solid state with E–P–C–P dihedral angles of 56.1(2)°...
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