Abstract:
Lysine is produced by a process comprising the steps of 1. Nitrating cyclohexanone to form 2-nitrocyclohexanone; 2. Nitrosating the 2-nitrocyclohexanone to form 2-nitro-6oximinocyclohexanone; 3. Ring opening the 2-nitro-6-oximinocyclohexanone in alcoholic base to form an ester of 2-oximino-6-nitrocaproic acid; 4. Hydrogenating the 2-oximino-6-nitro caproic acid alkyl ester to form an alkyl ester of lysine; and 5. Saponifying the lysine alkyl ester to afford lysine or a salt thereof.
Abstract:
L-lysineamide dihydrochloride can be isolated by preparing the intermediate D- and L-lysineamide-L-pyrrolidone carboxylate hydrochloride salts which can be separated from alkanol solution by fractional crystallization. The L-lysineamide pyrrolidone carboxylate hydrochloride salt is then treated with excess hydrogen chloride to form the desired L-lysineamide dihydrochloride.
Abstract:
Lysine is produced by a process comprising the steps of 1. Nitrating cyclohexanone to form 2-nitrocyclohexanone; 2. Nitrosating the 2-nitrocyclohexanone to form 2-nitro-6oximinocyclohexanone; 3. Ring opening the 2-nitro-6-oximinocyclohexanone in alcoholic base to form an ester of 2-oximino-6-nitrocaproic acid; 4. Hydrogenating the 2-oximino-6-nitro caproic acid alkyl ester to form an alkyl ester of lysine; and 5. Saponifying the lysine alkyl ester to afford lysine or a salt thereof.
WHEREIN R1, R2, R3, R4, R5, AND R6 ARE INDEPENDENTLY HYDROGEN, A C1 TO C6 ALKYL RADICAL, OR A MONOCYCLIC OR C1 TO C4 ALKYL-SUBSTITUTED AROMATIC MOIETY ARE READILY PREPARED BY REACTION OF ACETYL NITRATE WITH CONJUGATED DIENES OF THE STRUCTURE:
R1-C(-R2)=C(-R3)-C(-R4)=C(-R5)-R6
COMPOUNDS OF STRUCTURE (I) CAN BE READILY TRANSFORMED INTO THE CORRESPONDING AMINOALKANOL DERIVATIVE.
Abstract:
The nitrosation of Alpha -nitrocycloalkanones with alkyl nitrites, nitrogen oxides or nitrosyl halides is advantageously carried out utilizing liquid sulfur dioxide as a reaction solvent. Most advantageously, a strong acid catalyst is also present.
Abstract:
Alpha -amino- delta -valerolactam and Alpha -amino- Epsilon caprolactam are produced by contacting the corresponding Alpha aminocycloalkanone oxime or mineral acid salt thereof with liquid SO2 containing at least about 1 mole SO3 per mole Alpha aminocycloalkanone oxime until a two-phase system comprising a liquid SO2 phase and an insoluble lactam precursor phase is formed; separating the liquid SO2 phase from the insoluble phase containing the lactam precursor; hydrolyzing and neutralizing the insoluble lactam precursor phase and recovering the free lactam product.
Abstract:
Lysine.2HCl is converted to lysine.HCl by neutralization and crystallization with ammonia in an organic solvent. After removal of the precipitated lysine.HCl, the solvent mixture containing NH4Cl, some lysine.HCl and organic solvent is fractionated to recycle the solvent and then acidified with hydrochloric acid to salt out a major portion of the NH4Cl. The remaining solution is then combined with a lysine precursor to produce lysine.2HCl. This novel method ensures virtually complete recovery of lysine from the processing system.