✦ LIBER ✦

Photochemical conversion of poly-2,3-diphenylbutadiene to poly-9,10-dimethylenephenanthrene

✍ Scribed by M. Irie; W. Schnabel

Publisher: Elsevier Science
Year: 1982
Tongue: English
Weight: 303 KB
Volume: 18
Category: Article
ISSN: 0014-3057
DOI: 10.1016/0014-3057(82)90125-2

No coin nor oath required. For personal study only.

✦ Synopsis

Poly-2,3-diphenylbutadiene dissolved in CH2C12 has been subjected to continuous irradiation at 313 nm and to flash photolysis at 266 nm at room temperature. Cyclization of pendant phenyl groups to dihydrophenanthrene groups dominates over isomerization, indicating impeded flexibility of polymer chain segments. In the case of 2,3-diphenylbutene-2, isomerization dominates over cyclization. In the presence of 02, dihydrophenanthrene groups are converted to phenanthrene groups. Flash photolysis experiments in oxygenated solution revealed that phenanthrene groups are formed in the polymer according to two processes, viz. a fast spontaneous dehydrogenation and a slower oxidation.

📜 SIMILAR VOLUMES

Thermodynamics of depolymerization of bi

Thermodynamics of depolymerization of biotechnological poly[(R)-3-hydroxybutyrate] with formation of (R,R,R)-4,8,12-trimethyl-1,5,9-trioxadodeca-2,6,10-trione and of its polymerization with ring-opening to highly isotactic poly[(R)-3-hydroxybutyrate] from 0 to 500 K at standard pressure

✍ Boris V. Lebedev; Tat'yana A. Bykova; Elena G. Kiparisova; Valery G. Vasil'yev 📂 Article 📅 1996 🏛 John Wiley and Sons 🌐 English ⚖ 1002 KB

## Abstract In adiabatic vacuum and dynamic calorimeters the temperature dependence of the heat capacity __C__ of (__R__,__R__,__R__‐4,8,12‐trimethyl‐1,5,9‐trioxadodeca‐2,6,10‐trione a twelve‐membered cyclic trilactone), biotechnological poly[(__R__)‐3‐hydroxybutyrate] and highly isotactic poly[(__

Synthesis and characterization of novel

Synthesis and characterization of novel poly(arylene ether)s based on 9,10-bis-(4-fluoro-3-trifluoromethylphenyl) anthracene and 2,7-bis-(4-fluoro-3-trifluoromethylphenyl) fluorene

✍ Arun K. Salunke; Anindita Ghosh; Susanta Banerjee 📂 Article 📅 2007 🏛 John Wiley and Sons 🌐 English ⚖ 306 KB 👁 1 views

Synthesis of highly isotactic poly[(R)-3

Synthesis of highly isotactic poly[(R)-3-hydroxybutyrate] by ring-opening polymerization of (R,R,R)-4,8,12-trimethyl-1,5,9-trioxacyclododeca-2,6,10-trione

✍ Martin Melchiors; Helmut Keul; Hartwig Höcker 📂 Article 📅 1994 🏛 John Wiley and Sons 🌐 English ⚖ 428 KB

ChemInform Abstract: First Representativ

ChemInform Abstract: First Representatives of Macrocyclic Poly(diazene oxide furazans): 3,4: 7,8:11,12:15,16-Tetrafurazano-1,2,5,6,9,10,13,14-octaazacyclohexadeca- 1,3,5,7,9,11,13,15-octaene 1,9- and 1,10-dioxides (VI) and (IV), resp.; 1,5,9,13-Tetraoxide (II) and Its Crystal Structure

✍ V. A. EMAN; M. S. SUKHANOV; O. V. LEBEDEV; L. V. BATOG; L. S. KONSTANTINOVA; V. 📂 Article 📅 2010 🏛 John Wiley and Sons ⚖ 35 KB 👁 2 views

A stereoselective synthesis of methyl 1α

A stereoselective synthesis of methyl 1α-methyl-4-keto-cis-1,2,3,4,4aα,9,10,10aα-octahydrophenanthrene-1β-carboxylate and its conversion to (±) desisopropyl-cis-dehydroabietic acid and (±) desoxypodocarpic acid.

✍ S.K. Dasgupta; P.C. Antony 📂 Article 📅 1966 🏛 Elsevier Science 🌐 French ⚖ 273 KB

New Tandem Ring Enlargements of Bicyclo[

New Tandem Ring Enlargements of Bicyclo[3.3.0]octanes to Bicyclo[5.5.0]dodecanes and Subsequent Conversions into Tricyclo[5.5.0.0.2,9]dodecane and Tricyclo[5.5.0.02,10]dodecane Derivatives

✍ Eckehard Volker Dehmlow; Hans-Jörg Breyholz; Beate Neumann; Anja Stammler; Hans- 📂 Article 📅 2001 🏛 John Wiley and Sons 🌐 English ⚖ 440 KB 👁 1 views