Synthesis, crystal structure and theoretical studies of the first endo∶endo-2,4-diphosphabicyclo[1.1.0]butane

The synthesis of phosphorus heterocycles from tetra-tert-butyltetraphosphacubane

“…The 2,4-diphosphabicyclo[1.1.0]butane fragment is a rare structural motif and only three examples have been reported previously. The PÐC and CÐC bond lengths of the bicyclic framework (Table 2) are similar to those in previous examples (Niecke et al, 1999;Jones et al, 2001;Mack et al, 2002), and the PÐO and GaÐO bond lengths of the phosphinite function are also in keeping with previously reported examples of phosphinite±gallium adducts (Barron et al, 1996).…”

Study of the Air‐Tolerant 1,3‐Diphosphacyclobutane‐2,4‐diyl through the Direct Arylation

“…Phosphaalkynes have been employed for synthesis of a number of intriguing organophosphorus compounds ,. Using the sterically encumbered phosphaalkyne 2 , prepared by the 1,2‐elimination of disiloxane and the Fritsch‐Buttenberg‐Wiechell‐type rearrangement of phosphanylidenecarbene [Mes*P=C:],,,,, is useful to generate the phosphavinyl anion [RP=C(Li)Mes*] via the kinetically controlled regioselective nucleophilic addition of an organolithium reagent (RLi) ,. Prompt nucleophilic addition of the phosphavinyl anion [RP=C(Li)Mes*] to phosphaalkyne 2 affords 1,3‐diphosphacyclbuten‐4‐yl anion CBA via the [2+2] electrocyclization, of the anionic diphosphabutadiene intermediate (Scheme ) .…”

The interaction of phosphavinyl Grignard reagents with group 15 halides: synthesis and structural characterisation of novel heterocyclic and heterocage compounds

“…3 In addition, oxidative coupling of the phosphavinyl fragment can occur in these reactions to give strained heterocyclic systems such as 3 4 and 4. 5 Despite the facility of such coupling reactions, complexes containing 1 or 2 terminal phosphavinyl ligands can be prepared, e.g. [(o-C 6 H 4 O 2 )B-C(Bu t )=PCy] 6 and [Me 2 Sn{-C(Bu t )=PCy} 2 ], 2 and their utility as ligands has been explored.…”