1,3-Digermacyclobutanes with exocyclic CP and CPS double bonds

Abstract

New 1,3-digermacyclobutanes, with two exocyclic C=PMes* bonds, and the corresponding first bis(methylenethioxo)phosphoranes with C=P(S)Mes* moieties have been synthesized.

Chalcogeno[bis(phosphaalkenyl)] Germanium and Tin Compounds

“…The 31 P NMR spectrum of 3 displayed only one signal at 189.2 ppm ( 2 J P– 117/119 Sn = 258.8/270.6 Hz) showing that the four phosphorus atoms are magnetically equivalent. The low field chemical shift is characteristic of a λ 5 σ 3 phosphorus atom; similar chemical shifts have been reported for derivatives with a Mes*P(S)CGe moiety . The 1 H and 13 C NMR data clearly indicate the absence of the carbenic moiety and the perfect symmetry of the molecule.…”

“…The low field chemical shift is characteristic of a λ 5 σ 3 phosphorus atom; similar chemical shifts have been reported for derivatives with a Mes*P(S)CGe moiety. 19 The 1 H and 13 C NMR data clearly indicate the absence of the carbenic moiety and the perfect symmetry of the molecule. In addition, a triplet of triplet at −95.3 ppm with two coupling constants ( 2 J Sn−P = 270.7 Hz and 4 J Sn−P = 7.5 Hz) was observed in the 119 Sn NMR spectrum in agreement with the formation of such metalloheterocycles.…”

Phosphaalkenyl germylenes and their gold, tungsten and molybdenum complexes

“…4 However, among the large number of stable monomeric germanium(II) compounds reported to date, 5 there are surprisingly few examples of stable alkenyl group 14 divalent species; the last ones have generally been obtained by hydrometallation reactions. 5b,6 In previous studies, we highlighted the great interest of the phosphaalkenyl moieties for access not only to novel derivatives 7 but also for their ability to give various types of complexation. 8 We therefore considered an extension of these studies to the germanium divalent species.…”

Core and double bond functionalisation of cyclopentadithiophene-phosphaalkenes

“…[13][14][15][16][17] Furthermore, the lone pair at the phosphaalkene can easily be functionalised by metal coordination allowing for catalytic applications, [18][19][20] but also altering the opto-electronic properties. 21,22 A significantly less explored but equally powerful PvC functionalisation is its oxidation with chalcogens [23][24][25] and coordination by NHCs. 26 In view of these properties, we have already described the synthesis and excited state behaviour of phospha-and arsaalkene functionalised cyclopentadithiophene derivatives, where the heteroalkenes lead to pronounced acceptor character by stabilizing the heterofulvenoid-type antibonding orbitals.…”