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The first η31,3-diphosphaallyl complex 3 could be obtained from the methylenephosphane 1 and sodium tetracarbonylcobaltate 2. In 3, whose structure has been elucidated by an X-ray structure analysis, the PC distances are identical and lie between those of a PC single and a PC double bond (R = 2,4,6-tri-tert-butylphenyl).