Abstract(1) Sebacamide and N,N′‐diacetylhexamethylenediamine interchange to produce acetamide and polyhexamethylene sebacamide. (2) The rate is proportional to the concentrations of the two reacting species and to the square root of carboxyl group concentration. (3) The rate increases with increasing concentration of water. Reagents which had been held in the molten state under high vacuum were still capable of reaction. (4) N‐Substitution decreases the rate constant; the isobutyl group is more effective than methyl in this respect. (5) As an indication of the amount of interchange occurring during a typical polymerization, it is computed that at least 42% of the amide links interchange during the 66 nylon synthesis. This means that it is not feasible to make nonrandom copolyamides by polymerizing together low molecular weight homopolyamides. Interchange does provide for the production of nonrandom copolymers from two or more high molecular weight homopolyamides.
p-(p-Aminophenyl)-benzenesulfonamide and Derivatives
作者:I. F. Halverstadt、W. D. Kumler
DOI:10.1021/ja01847a506
日期:1941.2
Amide interchange reactions
作者:L. F. Beste、R. C. Houtz
DOI:10.1002/pol.1952.120080404
日期:1952.4
Abstract(1) Sebacamide and N,N′‐diacetylhexamethylenediamine interchange to produce acetamide and polyhexamethylene sebacamide. (2) The rate is proportional to the concentrations of the two reacting species and to the square root of carboxyl group concentration. (3) The rate increases with increasing concentration of water. Reagents which had been held in the molten state under high vacuum were still capable of reaction. (4) N‐Substitution decreases the rate constant; the isobutyl group is more effective than methyl in this respect. (5) As an indication of the amount of interchange occurring during a typical polymerization, it is computed that at least 42% of the amide links interchange during the 66 nylon synthesis. This means that it is not feasible to make nonrandom copolyamides by polymerizing together low molecular weight homopolyamides. Interchange does provide for the production of nonrandom copolymers from two or more high molecular weight homopolyamides.
<i>N,N</i>-Dimethylamination of Acid Chlorides with Dmf
作者:Woo Song Lee、Ki Hun Park、Yong-Jin Yoon
DOI:10.1080/00397910008087045
日期:2000.12
A solution of acid chlorides 3a-g in DMF solvent was refluxed to give N,N-dimethylamides 4a-f and 5g in excellent yields.