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Poly molecular weight multiplication

Successive multiple insertions of an aryl isocyanide (ArNC) into the S-S bond of a diaryl disulfide (ArS)2 occurs in the presence of Pd(PPh3)4 to produce the corresponding poly(imino)alkane endcapped with an arylthio group (Equation (65)).167 Products of higher molecular weights are formed when isolated poly(imino)alkanes are again subjected to the conditions of the insertion reaction (up to n — 9). [Pg.752]

The traditional way to classify polymerization reactions has been by stoichiometry—i.e., whether or not the molecular weight of the polymer produced is an exact multiple of the molecular weight of the monomer (exclusive of end groups). If so, the reaction has been termed an addition polymerization if weight was lost during polymerization, it was named condensation polymerization. Vinyl polymerization (Reaction 5) and polyurea formation (Reaction 6) are examples of the former, whereas polyesterification (Reaction 7) and formation of poly(a-amino acids) from N-carboxyanhydrides (Reaction 8) are examples of the latter. [Pg.236]

See other pages where Poly molecular weight multiplication is mentioned: [Pg.115]    [Pg.450]    [Pg.755]    [Pg.177]    [Pg.124]    [Pg.22]    [Pg.590]    [Pg.258]    [Pg.72]    [Pg.60]    [Pg.387]    [Pg.209]    [Pg.99]    [Pg.503]    [Pg.197]    [Pg.114]    [Pg.130]    [Pg.276]    [Pg.230]    [Pg.37]    [Pg.183]    [Pg.177]    [Pg.23]    [Pg.59]    [Pg.209]    [Pg.5983]    [Pg.251]    [Pg.460]    [Pg.166]    [Pg.108]    [Pg.4]    [Pg.105]    [Pg.550]    [Pg.144]    [Pg.281]    [Pg.6]    [Pg.5982]    [Pg.193]    [Pg.300]    [Pg.1033]    [Pg.819]    [Pg.35]    [Pg.394]    [Pg.35]    [Pg.177]    [Pg.50]    [Pg.291]    [Pg.22]   
See also in sourсe #XX -- [ Pg.367 , Pg.368 , Pg.369 ]



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Poly , molecular

Poly , molecular weights

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