Norbornadiene

About: Norbornadiene is a research topic. Over the lifetime, 2389 publications have been published within this topic receiving 38603 citations.

Arylcyanation of Norbornene and Norbornadiene Catalyzed by Nickel

Abstract: Aryl cyanides add to norbornene and norbornadiene under nickel catalysis to give (2R*,3S*)-3-aryl-2-cyanobicyclo[2.2.1]heptanes and (2R*,3S*)-3-aryl-2-cyanobicyclo[2.2.1]hept-5-enes in good yields ...

Transition metal complexes of the chelating phosphine borane ligand Ph2PCH2Ph2P·BH3

Abstract: Chromium and ruthenium complexes of the chelating phosphine borane H3B·dppm are reported. Addition of H3B·dppm to [Cr(CO)4(nbd)] (nbd = norbornadiene) affords [Cr(CO)4(η1-H3B·dppm)] in which the borane is linked to the metal through a single B–H–Cr interaction. Addition of H3B·dppm to [CpRu(PR3)(NCMe)2]+ (Cp = η5-C5H5) results in [CpRu(PR3)(η1-H3B·dppm)][PF6] (R = Me, OMe) which also show a single B–H–Ru interaction. Reaction with [CpRu(NCMe)3]+ only resulted in a mixture of products. In contrast, with [Cp*Ru(NCMe)3]+ (Cp* = η5-C5Me5) a single product is isolated in high yield: [Cp*Ru(η2-H3B·dppm)][PF6]. This complex shows two B–H–Ru interactions. Reaction with L = PMe3 or CO breaks one of these and the complexes [Cp*Ru(L)(η1-H3B·dppm)][PF6] are formed in good yield. With L = MeCN an equilibrium is established between [Cp*Ru(η2-H3B·dppm)][PF6] and the acetonitrile adduct. [Cp*Ru(η2-H3B·dppm)][PF6] can be considered as being “operationally unsaturated”, effectively acting as a source of 16-electron [Cp*Ru(η1-H3B·dppm)][PF6]. All the new compounds (apart from the CO and MeCN adducts) have been characterised by X-ray crystallography. The solid-state structure of H3B·dppm is also reported.

Molybdenum(0), ruthenium(II), palladium(II), platinum(II), copper(I) and gold (I) complexes of a new methoxy functionalised bis(phosphino)amine: synthesis and structure

Abstract: The synthesis, and characterisation, of a new functionalised bis(phosphino)amine Ph2PN(o-C6H4OMe)PPh21 from o-H2NC6H4OMe and 2 equiv. of Ph2PCl in diethyl ether at 0°C is reported. Oxidation of 1 with either aqueous H2O2, elemental S8 or grey Se affords the phosphorus(V) compounds Ph2P(E)N(o-C6H4OMe)P(E)Ph2 (E=O 2; S 3 or Se 4). Partial oxidation of 1 with 1 equiv. of S8 in n-hexane affords the mixed P(III)/P(V) species Ph2P(S)N(o-C6H4OMe)PPh25 in addition to small amounts of 3. Reaction of 1 (or 5) with [MX2(cod)] (M=Pd, Pt; X=Cl or CH3; cod=cycloocta-1,5-diene) affords either cis-[MX2{Ph2PN(o-C6H4OMe)PPh2}] (M=Pd, X=Cl 6; M=Pt, X=Cl 7; M=Pt, X=CH38) or the neutral five-membered chelate complexes [MCl2{Ph2P(S)N(o-C6H4OMe)PPh2}] (M=Pd 9, M=Pt 10) in which P,P- or P,S-chelation respectively was observed. Likewise reaction of [Mo(CO)4(nbd)] (nbd=norbornadiene) or [Cu(MeCN)4]PF6 with 1 gave cis-[Mo(CO)4{Ph2PN(o-C6H4OMe)PPh2}] 11 or [Cu{Ph2PN(o-C6H4OMe)PPh2}2]PF612. Chloro-bridge cleavage and arene elimination of [{RuCl2(p-cym)}2] (p-cym=p-cymene) with 1 (1:2 metal:ligand ratio) affords, in good yield, the octahedral bis chelate ruthenium(II) complex trans-[RuCl2{Ph2PN(o-C6H4OMe)PPh2}2] 13. In contrast, reaction of 1 with two equiv. of [AuCl(tht)] (tht=tetrahydrothiophene) gave the dinuclear complex [(ClAu)Ph2PN(o-C6H4OMe)PPh2(AuCl)] 14 in which the bis(phosphino)amine P,P-bridges two {AuCl} metal fragments. All new compounds have been characterised by a combination of multinuclear NMR [1H, 31P{1H} and 195Pt{1H}], IR spectroscopy and elemental analyses. The molecular structures of six representative examples have been determined by single-crystal X-ray crystallography.