3,3,5,6-tetramethyl-2H-pyrazine

反応条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 3.2 g of HTMP (hydroxymethylpiperidine), 52.3 g of paraformaldehyde and 206.3 g of 2,6-di-tert-butylphenol are rendered inert and are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer and a sublevel air lock for gas introduction. 52 g of dimethylamine gas are introduced at this temperature and the mixture is stirred at 85° C. for 1 hour. Addition of 332 g of triethyl phosphite is then carried out, after which the reaction mixture is kept at 115° C. for 4 hours. Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C. are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer after which the reaction mixture is kept at 115° C. for 4 hours Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C.

反応条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 3.2 g of HTMP (hydroxymethylpiperidine), 52.3 g of paraformaldehyde and 206.3 g of 2,6-di-tert-butylphenol are rendered inert and are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer and a sublevel air lock for gas introduction. 52 g of dimethylamine gas are introduced at this temperature and the mixture is stirred at 85° C. for 1 hour. Addition of 332 g of triethyl phosphite is then carried out, after which the reaction mixture is kept at 115° C. for 4 hours. Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C. are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer after which the reaction mixture is kept at 115° C. for 4 hours Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C.

反応条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 3.2 g of HTMP (hydroxymethylpiperidine), 52.3 g of paraformaldehyde and 206.3 g of 2,6-di-tert-butylphenol are rendered inert and are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer and a sublevel air lock for gas introduction. 52 g of dimethylamine gas are introduced at this temperature and the mixture is stirred at 85° C. for 1 hour. Addition of 332 g of triethyl phosphite is then carried out, after which the reaction mixture is kept at 115° C. for 4 hours. Working-up:distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C. are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer after which the reaction mixture is kept at 115° C. for 4 hours Working-up:distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C.

反応条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 3.2 g of HTMP (hydroxymethylpiperidine), 52.3 g of paraformaldehyde and 206.3 g of 2,6-di-tert-butylphenol are rendered inert and are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer and a sublevel air lock for gas introduction. 52 g of dimethylamine gas are introduced at this temperature and the mixture is stirred at 85° C. for 1 hour. Addition of 332 g of triethyl phosphite is then carried out, after which the reaction mixture is kept at 115° C. for 4 hours. Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C. are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer after which the reaction mixture is kept at 115° C. for 4 hours Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C.

反応条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 3.2 g of HTMP (hydroxymethylpiperidine), 52.3 g of paraformaldehyde and 206.3 g of 2,6-di-tert-butylphenol are rendered inert and are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer and a sublevel air lock for gas introduction. 52 g of dimethylamine gas are introduced at this temperature and the mixture is stirred at 85° C. for 1 hour. Addition of 332 g of triethyl phosphite is then carried out, after which the reaction mixture is kept at 115° C. for 4 hours. Working-up:distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C. are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer after which the reaction mixture is kept at 115° C. for 4 hours Working-up:distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C.

反応条件: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: 3.2 g of HTMP (hydroxymethylpiperidine), 52.3 g of paraformaldehyde and 206.3 g of 2,6-di-tert-butylphenol are rendered inert and are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer and a sublevel air lock for gas introduction. 52 g of dimethylamine gas are introduced at this temperature and the mixture is stirred at 85° C. for 1 hour. Addition of 332 g of triethyl phosphite is then carried out, after which the reaction mixture is kept at 115° C. for 4 hours. Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C. are initially introduced at 60° C. under reduced pressure into a double-jacketed flask with an outlet at the bottom, a baffle, an impeller stirrer after which the reaction mixture is kept at 115° C. for 4 hours Working-up: distillation of triethyl phosphite and dimethylamine under reduced pressure and crystallization of the residue from ligroin yield 320 g of product (90%), melting point 114° C.