Diene telomerisation

Abstract Over the past decade significant advances have been made in the fields of polymerisation, oligomerisation and telomerisation with metal-NHC catalysts. Complexes from across the transition series, as well as lanthanide examples, have been employed as catalysts for these reactions. Recent developments in the use of metal-NHC complexes in a-olefin polymerisation and oligomerisation, CO/olefm copolymerisation, atom-transfer radical polymerisation (ATRP) and diene telomerisation are discnssed in subsequent sections. 

Telomerisation is an important, atom efficient reaction, which generates functionalised dienes from 1,3-diene feedstocks. The reaction, which typically employs a palladium based catalyst, comprises coupling two molecnles of a conjugated 1,3-diene... 

Torrente-Murciano L, Lapkin A, Nielsen DJ, Fallis I, Cavell KJ (2010) Telomerisation of long-chain dienes with alcohols using Pd(Imes)(dvds) catalyst. Green Chem 12 866-869... 

Pennequin I, Mortreux A, Petit F, Mentech J, Thiriet B (1994) Telomerisation of conjugated diene with sugar (derivs.) - by a reaction in aq. soln. and in the presence of a palladium catalyst and a ligand. FR 2693188... 

The Pd-catalyzed telomerisation of 1,3-dienes (1,3-hutadiene, isoprene) with addition of a nucleophile (telogen) is a 100%-atom economical and versatile reaction that generates few waste and can he applied to a variety of bio-based substrates, including polyols, carbohydrates and sugar alcohols (Fig. 9). 5 jg attractive access to hio-hased hydrotropes. 

Telomerisation of formamide with buta-1,3-diene with a catalyst derived from PdS+/pph3/Et3Al/CF3C02H gives 16.8%... 

Re3(C0)- 3(u-n, n -olefinyl)] complexes. The radical monocation formed by one-electron oxidation of [Pd2(PhgCp)2(y-PhC2Ph)] reacts with dppe and dienes to give [PdL2(PhgCp)] (l2=dppe, nbd, cod, cot). Octadienyl bridged (95) and related complexes have been synthesised and applied in the telomerisation of butadiene. 

---