Amino pelargonic acid

Figure 10 Biosynthesis of biotin. 78, alanine 79, pimeloyl-CoA 80, 7-keto-8-amino-pelargonic acid 81, 7,8-diamino-pelargonic acid 82, dethiobiotin 6, biotin.

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. 

The 9-amino nonanic acid (amino pelargonic acid) is obtained by saponification of this acid. The same acid is produced as a by-product in the telomerization process described in Section 28.3.2,7. The nylon 9 obtained by polycondensation of the co-amino pelargonic acid has been found to have properties that lie between those of nylon 12, 11, and 8. 

Non-drying oil resins are soluble only in Aromatic hydrocarbons. They are used with amino resins for stoving finishes for appliances. Medium resins are used as plasticisers for cellulose nitrate. Along with natural oils several natural occurring and synthetic acid like resin (abiotic acid) pelargonic acid and isooctanoic acid are added to modify alkye resins. The alkyd resins are obtained by two processes, i.e., (1) Fatty Acid Process and (2) Alcoholysis process. 

The circulins—As early as 1949, Peterson and Reineke characterized circulin as its sulphate. Total hydrolysis yielded D-leucine, L-threonine and L-K,y-diaminobutyric acid together with an optically active isomer of pelargonic acid. The existence of two components, found by Peterson and Reineke was later confirmed by the chromatographic separation of crude circulin into two major components, named circulin A and circulin B. In addition there was evidence for at least three other ninhydrin-positive, biologically active entities. In the hydrolysate of circulin A, L-isoleucine was found besides the amino acids previously reported . Quantitative amino acid analysis showed circulin A and B to be composed of L-a,y-diamino-butyric acid, L-threonine, D-leucine, L-isoleucine and ( + )-6-methyloctanoic acid in the molar ratio 6 2 1 1 1. After partial acid hydrolysis, fractionation and structure determination of the resulting peptides, circulin A and circulin B were formulated as cyclodecapeptides . Very recently, however, Japanese workers have revised the structure of circulin A. According to them, circulin A differs from colistin A only by a replacement of L-leucine in the latter by L-isoleucine Figure 1.7). 

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