Quantum-Chemical Calculation of 1-Bis(dimethlamino)-4-bis(trimethylsilyl)-2,3-diphospha-1,3-butadiene

According to the results of ab initio quantum-chemical calculation 1-bis(dimethylamino)-4-bis(trimethylsilyl-2,3-diphosphabuta-1,3-diene exists as an E-isomer where electronic delocalization occurs involving donor dimethylamino and acceptor trimethylsilyl groups and also the multiple P = C bonds.