Capryl lactam

Polyamide 7 [poly(enantholactam)] is not produced commercially any more since all processes are too uneconomic. The last process tried was polycondensation of the a-amino enanthic acid. Polyamide 8 has not progressed past the semi-industrial capryl lactam polymerization. In the Soviet Union, polyamide 9 has been semi-industrially polycondensed from cu-amino pelargonic acid but is uneconomic. An economic process for synthesizing co-amino capric acid is also not known, and so an economic process for polyamide 10 is also unknown. 

L8 9 T -Capryl lactam T -Caprylolactam Octane-8-lactam azonan-2-one... 

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