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The crystal and molecular structure of 1-(2,4,6-tri-tert-butylphenyl)-4,4-bis(dimethylamino)-1-aza-2,3λ 3 -phosphabutadiene-1,3, Ttb-N=P-P=C(NMe 2 ) 2 , has been determined (crystal data of C 23 H 41 N 3 P,  C 2/ c ;  Z =8, monoclinic,  a  = 17.252(7),  b  = 9.014(3),  c  = 32.095(8) Å,  β  = 94.00(3)). The main geometrical parameters of  1  are: N=P 1.582(5), P-P 2.130(3), P=C 1.808(6) Å, CNP 123.8(4), NPP 111.6(2), PPC 94.1(2), CNPP -0.7, NPPC 176.8 o . Peculiarities of the molecular structure 1 (in particular, significant shortening of P-P single bond and realization of C-N=P-P bonds system in sterically unfavourable  cis -form) are discussed on the basis of  ab initio  calculations of the model phosphabutadiene systems.

Molecular structure of 1-(2,4,6-tri-tert-butylphenyl)-4,4-bis(dimethylamino)-1-aza-2,3λ 3 -phosphabutadiene-1,3