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The synthesis of the triphenylmethyl-phosphonic and -phosphonothioic dihalides Ph 3 CP(:X)Y 2  (X = O, S; Y = F, Cl) is described. The NMR parameters of these compounds are discussed and compared to these of other phosphonic and thiophosphonic dihalides. Single crystal X-ray analysis was used to confirm the structure of Ph 3 CP(:O)F 2  2 [C2/c, a = 1599.6(4), b = 1096.3(3), c = 1863.1(7) pm, ß = 109.11(2)°, T = 178 K, R = 0.034]. The geometry at the phosphorus atom is approximately tetrahedral. The bonds between phosphorus and fluorine are extremely short [P— F 153.1(1) and 153.3(1) pm]. Bond distances and angles for this compound are compared to those of methylphosphonic difluoride which were obtained from microwave spectra.

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Organophosphorverbindungen mit tertiären Alkylsubstituenten, II*: Synthese und Charakterisierung triphenylmethylsubstituierter λ 4 P(V)-Verbindungen; Kristallstruktur von Triphenylmethyl-Phosphonsäuredifluorid / Organophosphorus Compounds with Tertiary Alkyl Substituents, II*:&lt;br /&gt;Synthesis and Characterization of Triphenylmethyl-Substituted λ 4 P(V) Compounds;&lt;br /&gt;Crystal Structure of Triphenylmethylphosphonic Difluoride