Norbornadiene

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

Enantioselective synthesis of deltacyclenes using a [CoI2:Zn] catalytic system

Abstract: The efficient chiral catalyst [CoI 2 ;Zn/(L*) n ] readily promotes the homo Diels-Alder reactions between norbornadiene 1 and alkynes 2 , affording tetracyclic compounds called “deltatcyclenes” 3 . In this [2+2+2) cycloadditions, stereochemical control is achieved through the presence of catalytic amount of homochiral mono and bidentate ligands leading to deltacyclenes in high chemical and optical yields.

Intramolecular 1,3-dipolar cycloadditions of norbornadiene-tethered nitrones.

Abstract: Efficient routes to the synthesis of norbornadiene-tethered nitrones have been developed, and their intramolecular 1,3-dipolar cycloadditions were studied. The cycloadditions occurred in moderate to good yields for a variety of substrates and were found to be highly regio- and stereoselective, giving single regio- and stereoisomers in most cases.

Use of the seven-coordinate complexes [MXY(CO)3(NCMe)2] (M=Mo or W; X, Y=halide) and their derivatives in homogeneous catalysis

Abstract: The seven-coordinate halocarbonyl complexes, [MXY(CO) 3 (NCMe) 2 ] (M=Mo or W; X, Y=halide) and their derivatives have been investigated in several types of homogeneous catalytic reactions. These include, the alkene metathesis polymerisation of norbornadiene using either, [MX 2 (CO) 3 (NCMe) 2 ] (M=Mo or W;X=Br or I), [MI 2 (CO) 3 (L′- P , P ′)] {M=Mo or W; L′=MeC(CH 2 PPh 2 ) 3 } or [MXY(CO)(L or L′- P, P ′)(η 2 -RC 2 R′)] {X,Y=Cl, Br or I; L=PhP(CH 2 CH 2 PPh 2 ) 2 ; R,R′=Me, Ph}. The isolation and characterisation of a key intermediate, [WI 2 (CO) 2 (η 4 -nbd)] ( 1 ) (nbd=norbornadiene) is also described. The development of water soluble polymerisation catalysts using water-solubilising pyridine ligands, and the biphasic polymerisation of styrene using [WI 2 (CO) 3 (NC 5 H 4 CO 2 Na-4) 2 ], ZrCl 4 , sodium lauryl sulphate and sodium hydrogen phosphate is also discussed. The room temperature polymerisation of phenylacetylene using [WX 2 (CO) 3 (NCMe) 2 ] (X=Cl, I), [WI 2 (CO) 3 (NCMe)L] (L=PPh 3 , AsPh 3 ) or [WBr 2 (CO)(NCMe)(η 2 -HC 2 Ph) 2 ] ( 4 ) is also described, and a mechanism is proposed for these polymerisation reactions.