Synthesis and properties of functionalised dendrimers

Abstract

The published data on the synthesis, structure, proper-The published data on the synthesis, structure, properties and applications of dendrimers containing conjugated ties and applications of dendrimers containing conjugated p p-sys--systems, transition metal complexes and organometallic compounds tems, transition metal complexes and organometallic compounds are surveyed and systematised. The bibliography includes 83 are surveyed and systematised. The bibliography includes 83 references references. .

Synthesis of dendrimers with terminal formyl groups

“…137 °С. 1 Н NMR (acetone d 6 (4 Formylbenzyl) methanesulfonate (11). Anhydrous CH 2 Cl 2 (200 mL) was added to a solution of alcohol 2 (17.8 g, 0.13 mol) in Et 3 N ((36.6 mL, 0.26 mol).…”

Phosphapalladacycles: preparation routes

“…The only example of formation of a six-membered PCpalladacycle by a monodentate ligand is ortho-palladation of 4-(di-tert-butylphosphino)-3-(4-methoxyphenyl)sydnone (HL 13 ). The structure of dimer 13 was confirmed by X-ray diffraction.…”

“…The structure of dimer 13 was confirmed by X-ray diffraction. 63 The ortho-palladation of sydnonylphosphine HL 13 is possible only under simultaneous assistance of steric and electronic factors. Studies of other ligands of this class have shown that in the absence of the electron-donating 4-MeO group in the aromatic ring but with retention of the bulky substituents at phosphorus (HL 14 ) 64 and, especially, upon replacement of the bulky PBu t 2 group by the less bulky PPh 2 fragment in ligands HL 15 (see Ref.…”

“…6,7 The unique role of phosphine complexes of palladium in classical homogeneous catalysis is known; therefore, it is not surprising that phosphapalladacycles occupy a central place in the new branch of catalysis. 1, 5, 8 ± 12 Some data concerning the chemistry of mono-and bicyclic compounds of this class, including their dendrimeric forms, 13 can be found in recent reviews dealing with cyclometallation (involving all metals 14 ± 20 or only palladium 21 ) and organopalladium compounds. 22 Among the survey papers devoted to cyclometallated structures each with one particular heterodonor atom, 19, 23 ± 28 only one publication 19 is known dealing with complexes of various metals with P-donor ligands (up to mid-1979).…”

“…46 Conversely, PC-chelated phosphine-substituted phosphorus ylides are covered in the review, despite the formally neutral character of these ligands (actually, they are zwitter-ionic), because their C-donor atom shows carbanionic properties. Dendrimers containing phosphapalladacycles 13 are not discussed, but their precursors 48 ± 50 are included in Tables 1 ± 4 (see Supplement).…”