Ein neues PH‐funktionelles Diphosphadistannetan: (tBu2SnPH)2

A Novel PH‐Functional Diphosphadistannetane: (tBu2SnPH)2 The reaction of tBu2SnCl2 with NaPH2 in liquid ammonia yields the four‐membered ring compound (tBu2SnPH)2 (1). The corresponding silyl compound, (tBu2SnPSiMe3)2 (2), is obtained by metallation of 1 with tBuLi and metathesis with Me3SiCL Both compounds are characterized by NMR analysis (1H, 31P, 119Sn) and 1 by an X‐ray structure analysis; it reveals a planar heterocycle.