Structural properties, cyclic alkynes

Sections 5.1 and 5.2 discussed the structure of alkenes and alkynes, which are hydrocarbons that have 7i-bonds as an integral part of their structure. In both cases, cyclic structures were discussed, and both dienes and diynes were introduced. Compound 87, with the formula CgHg, is known as benzene, and it is a hydrocarbon derived from petroleum distillates. Benzene is very different from alkanes, alkenes, or alkynes in its chemical properties (see Chapter 21 for a full discussion of this chemistry). Benzene is the parent compound for a class... 

Winnik and coworkers [11] utilized an azide functional RAFT agent to synthesize azide functional linear PNIPAM followed by a thiol-ene Michael addition reaction with propargyl acrylate, producing a-alkyne-ou-azide PNIPAM. Consequently, the cyclization reaction by CuAAC was achieved in water with CUSO4 and ascorbic acid as the catalyst (Scheme 33). Further, the solution properties showed that the cyclic PNIPAM had higher phase transition temperature due to the endless chain structure of the cycUc compared to the linear counterpart with the same molecular weight. 

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