Polyacetylenes cyclization

Besides processes (1) and (2), the reader should be aware that nucleophilic attacks on alkynes are treated in other chapters of this book, dealing with rearrangements, cyclizations, polyacetylenes, cyclic acetylenes and perhaps others. A number of publications overlap with ours in different ways and at different levels -. They treat individual alkynes or families " , e.g. acetylene, diacetylenes , acetylene dicarboxylic esters haloacetylenes , alkynyl ethers and thioethers > ynamines , fluoro-alkynes ethynyl ketpnes , nitroalkynes , etc. synthetic targets, e.g. pyrazoles , if-l,2,3-triazoles , isothiazoles , indolizines S etc. reagents, e.g. nitrones , lithium aluminium hydride , heterocyclic A -oxides - , azomethine ylids - , tertiary phosphorus compounds , miscellaneous dipolar nucleophiles - , etc. The reader will appreciate that all of these constitute alternate entries into our subject. 

A series of oligomeric macrocyclic polyacetylenes has been obtained by oxidative coupling of 5,5-dimethylnona-l,8-diyne, and hexadeca-l,15-diyne has been cyclized by reaction with 1,12-dibromododecane or 1,14-dibromo-tetradecane and butyl-lithium. ... 

Polychloroprene (CR) Polynorbornene Cyclized rubber Polyacetylene Diacetylene Dry-blend resin Dispersion (plastisol) resin Poly(vinyl butyral)... 

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