Acetylenes metathesis copolymerization

Table 10.6 Metathesis copolymerization of acetylenes with each other...

The metathesis copolymerization of the cyclobutene derivative, 7,8-bis(trifluoro-methyl)tricyclo[4.2.2.0 ]deca-3,7,9-triene (MO (7 in Ch. 13), with norbomene or cyclopentene (M2) gives copolymers that are readily converted into acetylene copolymers by elimination of l,2-bis(trifluoro)benzene from the Mi units, but the compositional sequence distribution in these copolymers is difficult to establish (Ramakrishnan 1989b). 

Acetylenes copolymerize with each other and with cycloalkenes under the influence of olefin metathesis catalysts. With non-living systems it is possible to make statistical... 

Diynes, such as dipropargyl derivatives, are amenable to cyclopolymerization giving high-molecular-weight polymers (eq. (11), where X = O, S, R2Si, C(C02Et)2, etc). In the presence of an olefin metathesis catalyst, acetylenes copolymerize with each other and with cyclic alkenes. 

Amass and Stowell et al. replaced the Zeigler-Natta catalyst with a methathesis catalyst for the copolymerization of acetylene with various flexible components including cyclic alkene. The metathesis catalyst has a slower polymerization rate for acetylene and therefore better control of the acetylene segment length. In a series of three papers [67-69], the efficiency of the... 

The procedures were extended for the copolymerization of styrene and acetylene using an anionic to metathesis transformation reaction [68]. Anionic prepared living polystyryl lithium was stored for 48 hours and then reacted with a stock solution of WCle (Li/W = 4). The mixture turned colorless. After an induction period of... 

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