Norbornadiene

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

Cationic grafting of norbornadiene, indene, and 1,3-cyclohexadiene from PVC

Abstract: The synthesis of three novel graft copolymers consisting of a PVC backbone fitted with polynorbornadiene (PNbd), polyindene (PInd), polycyclohexadiene (PCHD) branches, i.e., PVC-g-PNbd, PVC-g-PInd, and PVC-g-PCHD, is described. The synthesis strategy was to initiate the grafting of norbornadiene (Nbd), indene (Ind), and 1,3-cyclohexadiene (CHD) by a PVC containing ∼ 1.6 active (tertary and allylic) chlorines in conjunction with Et 2 AlCl. The products were characterized by solvent fractionation, molecular weight determination, Tg, and NMR spectroscopy. The effect of temperature on the grafting was investigated in the 20 to -50 °C range.

Poly(1,5‐hexadiyne) films prepared using rhodium(i) catalysts

Abstract: Bis(1,5-cyclooctadiene)dirhodium(I)dichloride and bis(norbornadiene)-dirhodium(I)dichloride are effective catalysts for polymerization of 1,5-hexadiyne. The structure of the polymer obtained and its behaviour towards oxidation and oxidizing agents has been elucidated by means of infrared and ultraviolet spectroscopy. It is proposed that polymerization proceeds with formation of a polymer having a five-membered ring in each of its monomeric units. The polymer is highly conjugated and can be obtained directly during polymerization as film, which has a metallic lustre, is insoluble in common solvents, and shows good resistance to oxidation in air, if sufficiently thick.

3H-1,3-Azaphospholo[4,5-b]pyridines--novel heterocyclic P,N-bridging or hybrid ligands: synthesis and first d(8)-transition metal complexes.

Abstract: The first 3H-1,3-azaphospholo-pyridines 2a-c were synthesized as racemic mixtures in modest to medium yield by the reaction of N-(2-chloropyrid-3-yl)-trimethylacetimidoyl chloride 1 with RPLi2 (R = Ph, n-Bu, i-Bu), generated from RPH2 and BuLi in THF at -70 °C, and studied with respect to their suitability as ligands (L) in transition metal complexes. Reactions of 2a with group 6 metal(0) pentacarbonyls led to P-coordinated LM(CO)5 complexes 3a-5a (Cr, Mo, W) and the reaction of 2c with (norbornadiene)Mo(CO)4 surprisingly to 4c. [Rh(1,5-COD)Cl]2 and 2a,b, in metal/ligand ratio 1 : 1, furnished LRh(1,5-COD)Cl complexes 6a,b with P-coordination, 6b accompanied by a minor contamination by the bis-coordinated L[Rh(COD)Cl]2 complex 7b. Reactions of 2a,b with [(allyl)PdCl]2 proceeded in THF with dismutation of N-coordinated (allyl)PdCl and formed with 2a a labile crude product [(2a){(allyl)PdCl}1.2(PdCl2)0.8]·C4H8O, with the composition close to L[Pd(allyl)Cl]PdCl2 THF (8a·THF), which converted during crystallization to 9a, whereas 2b directly formed the N,N'-PdCl2-bridged bis[LPd(allyl)chloride] complex 9b. Conversion of 2b with equimolar amounts of Pd(CH3CN)2Cl2 in THF, or Na2PdCl4 in methanol, gave rise to the dimeric P,N-bridging complex 10b. Crystal structure analyses of 6a (rac), 9b·2CDCl3 (meso), 10b·4.5THF and 10b·2D6-acetone (rac) provided detailed structural information. 10b, but more efficiently complexes formed in situ from 2a,b and Pd2(DBA)3 or Pd(OAc)2, catalysed the arylamination of 2-bromopyridine with 2,4,6-trimethylaniline.