87555-15-5

Upstream product

• 62234-71-3 5-exo,6-endo,7-exo,8-endo-5,6,7,8-tetra(hydroxymethyl)bicyclo[2.2.2]oct-2-ene 
• 56745-93-8 2,3,5,6-exo-bicyclo<2.2.2>-7-octene-2,3,5,6-tetracarboxylic acid tetramethyl ester 
• 3573-76-0 (1r,2R,3S,4r,5R,6S)-bicyclo<2.2.2>oct-2-ene-2,3,5,6-tetracarboxylic bisanhydride 
• 56745-93-8 tetramethyl all-trans-bicyclo[2.2.2]oct-7-ene-2,3,5,6-tetracarboxylate 
• 120664-28-0 (1r,2R,3R,4s,5S,6S)-bicyclo<2.2.2>oct-7-ene-2,3,5,6-tetramethanol 
• 56782-36-6 2,6-exo-3,5-endo-bicyclo<2.2.2>-7-octene-2,3,5,6-tetracarboxylic acid tetramethyl ester 
• 62234-71-3 (+/-)-exo-2,endo-3,exo-5,endo-6-tetrakis(hydroxymethyl)bicyclo<2.2.2>oct-7-ene 

Downstream Products

• 62234-75-7 5,6,7,8-tetramethylenebicyclo[2.2.2]oct-2-ene 

Relevant academic research and scientific papers

Extremely large cavity assembled by self-interlocking of distorted biconcave porphyrins

X-Ray analyses of free base, zinc, and nickel complexes of 2,3;7,8;12,13;17,18-tetrakis(6,13-dihydro-6,13-pentaceno)-21H,23H-porphine revealed that the porphyrin chromophores adopted a heavily-saddled conformation by interlocking of the biconcave porphyrins in the crystals containing halobenzenes as crystalline solvents, while the ring was almost flat in the crystals obtained from benzene or from chlorobenzene and isopropanol.

METHOD OF PREPARATION OF A PRECURSOR OLIGOCENE

The synthesis of a precursor oligocene, particularly pentacene, is a two-step process. In the fist step the Diels-Alder adduct of the a,b-dihydro-a,b-etheno-oligocene with a 1,1-dialkoxy-cyclopentadiene is formed. In the second step this Diels-Alder adduct is converted into the precursor oligocene, in that first the corresponding keto-compound is formed, which may be eliminated thereafter. The resulting precursor oligocene can be converted to the oligocene with a heat treatment, particularly after providing a solution hereof on a substrate. It is suitable for use as semiconductor material in a thin-film transistor. Formula (I).

Tandem Diels-Alder Reactivity Controlled by Remote Substituents. Regioselective Synthesis of Linearly Annellated Six-Membered Ring Systems from (1RS,5SR,6RS,7SR)-6,7-Bis(chloromethyl)-8,9-dimethylidene-2-oxabicyclononan-3-one. Crystal Structure of

Syntheses of 6,7,8,9-tetramethylidene-2-oxabicyclononan-3-one (12), 6,7,8,9-tetramethylidene-2-azatricyclononan-3-one (13), and (1RS,5SR,6RS,7SR)-6,7-bis(chloromethyl)-8,9-dimethylidene-2-oxabicyclononan-3-one (14) are presented.The r

SYNTHESIS OF POLYFUNCTIONAL, LINEARLY CONDENSED SIX-MEMBERED RING SYSTEMS BY REGIOSELECTIVE TANDEM DIELS-ALDER ADDITIONS. SYNTHESIS AND REACTIVITY OF 6,7-BIS(CHLOROMETHYL)-8,9-BIS(METHYLENE)-2-OXABICYCLONONAN-3-ONE

The title compound is a useful starting material for the preparation of complex linearly condensed six-membered ring systems via tandem Diels-Alder additions.

THE 7,8-EPOXY2,3,5,6-TETRAKIS(METHYLENE)BICYCLOOCTANE; SYNTHESIS AND DIELS-ALDER REACTIVITY

The preparation of 7,8-epoxy-2,3,5,6-tetrakis(methylene)bicyclooctane (5) is described.Evidence for transannular interaction between the homoconjugated s-cis-butadiene functions in 5 is found in the UV absorption spectrum.The Diels-Alder addition of 5 to tetracyanoethylene (TCE) is syn-regioselective and leads to the monoadducts 16:17 (85:15).The dienes 16, 17 are less reactive then 5 toward TCE. anti-regioselectivity (leading to exo-2, endo-3-bis(chloromethyl)-5,6-bis(methylene)-syn-7,8-epoxybicyclooctanes) (25) is observed in the double elimination of HCl from the syn-7,8-epoxy-exo-2,endo-3,exo-5,endo-6-tetrakis(chloromethyl)bicyclooctane (11), precursor of 5.The structure of the regioisomers 16, 17 were confirmed spectroscopically and chemically.Elimination of HCl from the chloromethyl groups in 26 (TCE adduct of 25) and HCN from the TCE adducts 16, 17 and 26 can be induced by CsF in DMF.