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CAS

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24544-08-9

2,6-Diethyl-4-methylaniline (DEMA) is an organic compound that belongs to the class of aniline derivatives. It is characterized by its colorless to yellowish liquid appearance and is primarily utilized as an intermediate in the chemical synthesis industry.

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  • 24544-08-9 Structure

  • Basic information

    1. Product Name: 2,6-Diethyl-4-methylaniline
    2. Synonyms: 2,6-DIETHYL-4-METHYLANILINE;2,6-diethyl-4-methylbenzenamine;2,6-Diethyl-4-methylanilin;2,6-Diethyl-p-toluidine (NH2=1);2,6-DIETHYL-4-METHYLANILINE(DEMA),DEMA:=98.5%(CAPILLARY GC);(2,6-diethyl-4-methyl-phenyl)amine;Benzenamine,2,6-diethyl-4-methyl-;DEMA
    3. CAS NO:24544-08-9
    4. Molecular Formula: C11H17N
    5. Molecular Weight: 163.26
    6. EINECS: 246-307-5
    7. Product Categories: Intermediates of Dyes and Pigments;o-alkylated Anilines;Aniline Derivatives
    8. Mol File: 24544-08-9.mol

  • Chemical Properties

    1. Melting Point: N/A
    2. Boiling Point: 259.058 °C at 760 mmHg
    3. Flash Point: 111.736 °C
    4. Appearance: Colourless to yellowish liquid
    5. Density: 0.94 g/cm3
    6. Vapor Pressure: 0.0132mmHg at 25°C
    7. Refractive Index: 1.539
    8. Storage Temp.: Keep in dark place,Inert atmosphere,Room temperature
    9. Solubility: N/A
    10. PKA: 4.56±0.10(Predicted)
    11. Water Solubility: 570mg/L at 20℃
    12. CAS DataBase Reference: 2,6-Diethyl-4-methylaniline(CAS DataBase Reference)
    13. NIST Chemistry Reference: 2,6-Diethyl-4-methylaniline(24544-08-9)
    14. EPA Substance Registry System: 2,6-Diethyl-4-methylaniline(24544-08-9)

  • Safety Data

    1. Hazard Codes: N/A
    2. Statements: 20/21/22-36/37/38
    3. Safety Statements: 26-36/37/39
    4. WGK Germany:
    5. RTECS:
    6. HazardClass: N/A
    7. PackingGroup: N/A
    8. Hazardous Substances Data: 24544-08-9(Hazardous Substances Data)

24544-08-9 Usage

Uses

Used in Chemical Synthesis Industry:
2,6-Diethyl-4-methylaniline is used as an intermediate for chemical synthesis, playing a crucial role in the production of various compounds and materials. Its unique structure and properties make it a valuable component in the synthesis of dyes, pharmaceuticals, and other specialty chemicals. The versatility of DEMA in chemical reactions contributes to its widespread use in this application.

Check Digit Verification of cas no

The CAS Registry Mumber 24544-08-9 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,4,5,4 and 4 respectively; the second part has 2 digits, 0 and 8 respectively.
Calculate Digit Verification of CAS Registry Number 24544-08:
(7*2)+(6*4)+(5*5)+(4*4)+(3*4)+(2*0)+(1*8)=99
99 % 10 = 9
So 24544-08-9 is a valid CAS Registry Number.
InChI:InChI=1/C11H17N/c1-4-9-6-8(3)7-10(5-2)11(9)12/h6-7H,4-5,12H2,1-3H3

24544-08-9SDS

SAFETY DATA SHEETS

According to Globally Harmonized System of Classification and Labelling of Chemicals (GHS) - Sixth revised edition

Version: 1.0

Creation Date: Aug 20, 2017

Revision Date: Aug 20, 2017

1.Identification

1.1 GHS Product identifier

Product name 2,6-Diethyl-4-methylaniline

1.2 Other means of identification

Product number -
Other names 4-methyl-2,6-diethyl-aniline

1.3 Recommended use of the chemical and restrictions on use

Identified uses For industry use only.
Uses advised against no data available

1.4 Supplier's details

1.5 Emergency phone number

Emergency phone number -
Service hours Monday to Friday, 9am-5pm (Standard time zone: UTC/GMT +8 hours).

More Details:24544-08-9 SDS

24544-08-9Synthetic route

ethanol
64-17-5

ethanol

p-toluidine hydrochloride
540-23-8

p-toluidine hydrochloride

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

Conditions
ConditionsYield
at 300℃;
p-toluidine
106-49-0

p-toluidine

aluminium
7429-90-5

aluminium

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

Conditions
ConditionsYield
aluminium trichloride In water
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

(S)-(-)-1-(tert-butoxycarbonyl)-2-piperidinecarboxylic acid
26250-84-0

(S)-(-)-1-(tert-butoxycarbonyl)-2-piperidinecarboxylic acid

C22H34N2O3
1526920-89-7

C22H34N2O3

Conditions
ConditionsYield
Stage #1: (S)-(-)-1-(tert-butoxycarbonyl)-2-piperidinecarboxylic acid With triethylamine; isobutyl chloroformate In dichloromethane at 0℃; for 0.5h;
Stage #2: 2,6-diethyl-4-methylaniline In dichloromethane at 0 - 20℃; for 24h;		99%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

1-bromo-2,6-diethyl-4-methylbenzene
314084-61-2

1-bromo-2,6-diethyl-4-methylbenzene

Conditions
ConditionsYield
Stage #1: 2,6-diethyl-4-methylaniline With hydrogen bromide at 10℃; for 0.5h;
Stage #2: With sodium nitrite at -5 - 0℃; for 2.5h;
Stage #3: With ferrous(II) sulfate heptahydrate; hydrogen bromide; sodium bromide In water at 65 - 75℃; for 0.5h; Reagent/catalyst;		95%
Stage #1: 2,6-diethyl-4-methylaniline With hydrogen bromide In water at 80℃; for 1.5h;
Stage #2: With sodium nitrite In water at -10 - -5℃; for 2h;
Stage #3: With ferrous(II) sulfate heptahydrate; hydrogen bromide In water at 80℃; for 2h;		94.66%
Stage #1: 2,6-diethyl-4-methylaniline With hydrogen bromide; sodium nitrite In water at 0 - 5℃; for 0.5h;
Stage #2: With copper(I) bromide at 5 - 60℃; for 4h;		89.2%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

diethyl malonate
105-53-3

diethyl malonate

2-(2,6-diethyl-4-methylphenyl)malonic acid diethyl ester
328932-70-3

2-(2,6-diethyl-4-methylphenyl)malonic acid diethyl ester

Conditions
ConditionsYield
Stage #1: 2,6-diethyl-4-methylaniline With copper(l) iodide; isopentyl nitrite In tetrahydrofuran at 5 - 10℃; for 2h;
Stage #2: diethyl malonate With potassium tert-butylate In tetrahydrofuran; N,N-dimethyl-formamide at 0 - 20℃; for 2.5h; Reagent/catalyst;		92%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2-chloro-1,3-diethyl-5-methylbenzene

2-chloro-1,3-diethyl-5-methylbenzene

Conditions
ConditionsYield
Stage #1: 2,6-diethyl-4-methylaniline With hydrogenchloride In 1,2-dichloro-benzene at 45 - 70℃;
Stage #2: With hydrogenchloride; isopentyl nitrite In 1,2-dichloro-benzene at 45 - 50℃; for 2h;		90%
Stage #1: 2,6-diethyl-4-methylaniline With hydrogenchloride In water at 50℃; Sandmeyer Reaction;
Stage #2: With sodium nitrite In water at -10 - -5℃; for 1h; Sandmeyer Reaction;
Stage #3: With hydrogenchloride; iron(III) chloride In water at -10 - 65℃; for 1.5h; Product distribution / selectivity; Sandmeyer Reaction;
cobalt(II) chloride hexahydrate

cobalt(II) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

α,α′-dioxo-2,3:5,6-bis(hexamethylene)pyridine
96413-30-8

α,α′-dioxo-2,3:5,6-bis(hexamethylene)pyridine

C39H51Cl2CoN3

C39H51Cl2CoN3

Conditions
ConditionsYield
With acetic acid for 12h; Reflux;90%
With acetic anhydride at 130℃; for 12h;90%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

C11H16NO3S(1-)*Na(1+)

C11H16NO3S(1-)*Na(1+)

3’,6’-dichlorospiro[3H-2,1-benzoxathiol-3,9’-[9H]xanthene]-1,1-dioxide
77545-45-0

3’,6’-dichlorospiro[3H-2,1-benzoxathiol-3,9’-[9H]xanthene]-1,1-dioxide

C41H41N2O7S2(1-)*Na(1+)

C41H41N2O7S2(1-)*Na(1+)

Conditions
ConditionsYield
Stage #1: C11H16NO3S(1-)*Na(1+); 3’,6’-dichlorospiro[3H-2,1-benzoxathiol-3,9’-[9H]xanthene]-1,1-dioxide With 1,8-diazabicyclo[5.4.0]undec-7-ene; magnesium bromide In ethylene glycol at 120℃; for 2h;
Stage #2: 2,6-diethyl-4-methylaniline In ethylene glycol at 180℃; for 18h; Reagent/catalyst;		88%
iron(II) chloride tetrahydrate

iron(II) chloride tetrahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

α,α′-dioxo-2,3:5,6-bis(hexamethylene)pyridine
96413-30-8

α,α′-dioxo-2,3:5,6-bis(hexamethylene)pyridine

[2,3:5,6-{C5H10C(N-4-Me-2,6-Et2C6H2)}2C5HN]FeCl2

[2,3:5,6-{C5H10C(N-4-Me-2,6-Et2C6H2)}2C5HN]FeCl2

Conditions
ConditionsYield
With acetic anhydride at 130℃; for 12h;87%
In acetic acid for 12h; Inert atmosphere; Schlenk technique; Reflux;75%
6-(2,4,6-triisopropylphenyl)-2-pyridinecarboxaldehyde
1433897-26-7

6-(2,4,6-triisopropylphenyl)-2-pyridinecarboxaldehyde

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

(E)-N-(2,6-diethyl-4-methylphenyl)-1-(6-(2,4,6-triisopropylphenyl)pyridin-2-yl)methanimine

(E)-N-(2,6-diethyl-4-methylphenyl)-1-(6-(2,4,6-triisopropylphenyl)pyridin-2-yl)methanimine

Conditions
ConditionsYield
With formic acid In methanol at 60℃; for 24h; Schlenk technique; Inert atmosphere; Sealed tube;87%
1,1-Dichloroethylene
75-35-4

1,1-Dichloroethylene

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

C13H17Cl3

C13H17Cl3

Conditions
ConditionsYield
With tert.-butylnitrite; copper dichloride In acetonitrile at 10 - 20℃; for 16h; Reagent/catalyst;85.1%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

3’,6’-dichlorospiro[3H-2,1-benzoxathiol-3,9’-[9H]xanthene]-1,1-dioxide
77545-45-0

3’,6’-dichlorospiro[3H-2,1-benzoxathiol-3,9’-[9H]xanthene]-1,1-dioxide

3,5-diisopropyl sulfanilic acid sodium salt

3,5-diisopropyl sulfanilic acid sodium salt

C42H43N2O7S2(1-)*Na(1+)

C42H43N2O7S2(1-)*Na(1+)

Conditions
ConditionsYield
Stage #1: 3’,6’-dichlorospiro[3H-2,1-benzoxathiol-3,9’-[9H]xanthene]-1,1-dioxide; 3,5-diisopropyl sulfanilic acid sodium salt With 1,8-diazabicyclo[5.4.0]undec-7-ene; magnesium bromide In ethylene glycol at 120℃; for 2h;
Stage #2: 2,6-diethyl-4-methylaniline In ethylene glycol at 180℃; for 18h;		85%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2,6-diethyl-4-methyliodobenzene

2,6-diethyl-4-methyliodobenzene

Conditions
ConditionsYield
Stage #1: 2,6-diethyl-4-methylaniline With hydrogenchloride In water at 80 - 90℃;
Stage #2: With sodium nitrite In water at -10 - 0℃;
Stage #3: With hydrogenchloride; sodium iodide In water at 80 - 90℃; for 16h;		83%
Stage #1: 2,6-diethyl-4-methylaniline With hydrogenchloride; sodium nitrite In water at 0 - 5℃; for 1h;
Stage #2: With potassium iodide In water at 5 - 20℃; Reagent/catalyst;
1,4-dihydroxy-9,10-anthracenedione
81-64-1

1,4-dihydroxy-9,10-anthracenedione

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

C.I. Solvent Blue 97
32724-62-2

C.I. Solvent Blue 97

Conditions
ConditionsYield
With LACTIC ACID; Trimethyl borate; 2,3-dihydro-1,4-dihydroxyanthraquinone at 115 - 145℃; for 11.5h;82%
1-Nitronaphthalene
86-57-7

1-Nitronaphthalene

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

C21H23N

C21H23N

Conditions
ConditionsYield
With potassium phosphate tribasic trihydrate; 2-(2,6-diethyl-4-methylphenyl)-5-(2,4,6-triisopropylphenyl)imidazo[1,5-a]pyridin-2-ium chloride; palladium(II) acetylacetonate In 1,4-dioxane at 130℃; for 24h; Sealed tube; Inert atmosphere;80%
With bis(acetylacetonato)palladium(II); potassium phosphate tribasic trihydrate; 2-(2,6-diethyl-4-methylphenyl)-5-(2,4,6-triisopropylphenyl)imidazo[1,5-a]pyridin-2-ium chloride In 1,4-dioxane at 130℃; for 24h; Inert atmosphere;80%
2-acetyl-cycloheptapyridine

2-acetyl-cycloheptapyridine

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2-(1-(2,6-diethyl-4-methylphenylimino)ethyl)cycloheptapyridine

2-(1-(2,6-diethyl-4-methylphenylimino)ethyl)cycloheptapyridine

Conditions
ConditionsYield
With toluene-4-sulfonic acid In toluene for 6h; Inert atmosphere; Schlenk technique; Reflux;78%
nickel(II) chloride hexahydrate

nickel(II) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2-(hydroxymethyl)-6,7-dihydroquinolin-8(5H)-one

2-(hydroxymethyl)-6,7-dihydroquinolin-8(5H)-one

C21H26Cl2N2NiO

C21H26Cl2N2NiO

Conditions
ConditionsYield
With toluene-4-sulfonic acid In toluene for 8h; Reflux;78%
cobalt(II) chloride hexahydrate

cobalt(II) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

1,2,3,7,8,9,10-heptahydrocyclohepta[b]-quinoline-4,6-dione

1,2,3,7,8,9,10-heptahydrocyclohepta[b]-quinoline-4,6-dione

N4,N6-bis(2,6-diethyl-4-methylphenyl)-2,3,7,8,9,10-hexahydro-1H-cycloheptaquinoline-4,6-diimine cobalt dichloride

N4,N6-bis(2,6-diethyl-4-methylphenyl)-2,3,7,8,9,10-hexahydro-1H-cycloheptaquinoline-4,6-diimine cobalt dichloride

Conditions
ConditionsYield
In acetic acid for 12h; Inert atmosphere; Schlenk technique; Reflux;77%
With acetic acid at 130℃; for 12h; Inert atmosphere;77%
iron(II) chloride tetrahydrate

iron(II) chloride tetrahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

1,2,3,7,8,9,10-heptahydrocyclohepta[b]-quinoline-4,6-dione

1,2,3,7,8,9,10-heptahydrocyclohepta[b]-quinoline-4,6-dione

N4,N6-bis(2,6-diethyl-4-methylphenyl)-2,3,7,8,9,10-hexahydro-1H-cycloheptaquinoline-4,6-diimine ferric dichloride

N4,N6-bis(2,6-diethyl-4-methylphenyl)-2,3,7,8,9,10-hexahydro-1H-cycloheptaquinoline-4,6-diimine ferric dichloride

Conditions
ConditionsYield
With acetic acid at 130℃; for 12h; Inert atmosphere;74%
4-oxo-1,2,3,4-tetrahydroacridine
49568-10-7

4-oxo-1,2,3,4-tetrahydroacridine

nickel(II) chloride hexahydrate

nickel(II) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

4-(2,6-diethyl-4-methylphenylimino)-1,2,3-trihydroacridylnickel(II) dichloride

4-(2,6-diethyl-4-methylphenylimino)-1,2,3-trihydroacridylnickel(II) dichloride

Conditions
ConditionsYield
In acetic acid for 3h; Reflux;72.9%
nickel(II) chloride hexahydrate

nickel(II) chloride hexahydrate

2-isopropyl-5,6,7-trihydroquinolin-8-one
1369217-33-3

2-isopropyl-5,6,7-trihydroquinolin-8-one

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2,6-diethyl-4-methyl-N-(2-isopropyl-5,6,7-trihydroquinolin-8-ylidene)phenylaminonickel(II) dichloride

2,6-diethyl-4-methyl-N-(2-isopropyl-5,6,7-trihydroquinolin-8-ylidene)phenylaminonickel(II) dichloride

Conditions
ConditionsYield
In acetic acid under N2, Schlenk technique; quinoline deriv., amine, NiCl2*6H2O and acetic acid placed in round bottom flask; stirred at reflux for 5 h; acid removed under reduced pressure; residue dissolved in MeOH; pptd. with Et2O; filtered, washed with Et2O, dried under vac.; elem. anal.;72%
nickel(II) chloride hexahydrate

nickel(II) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2-chloro-5,6,7,8-tetrahydroquinolin-8-one
129337-86-6

2-chloro-5,6,7,8-tetrahydroquinolin-8-one

[2,6-diethyl-4-methyl-N-(2-chloro-5,6,7-trihydroquinolin-8-ylidene)phenylamino]nickel(II) dichloride
1263563-92-3

[2,6-diethyl-4-methyl-N-(2-chloro-5,6,7-trihydroquinolin-8-ylidene)phenylamino]nickel(II) dichloride

Conditions
ConditionsYield
In acetic acid (N2); quinolinone, aniline and NiCl2*6H2O were refluxed in AcOH for 3 h; evapd. in vac., dissolved in MeOH, filtered, precipitated with Et2O, filtered, washed with Et2O, dried in vac., elem. anal.;71%
4-oxo-1,2,3,4-tetrahydroacridine
49568-10-7

4-oxo-1,2,3,4-tetrahydroacridine

iron(II) chloride tetrahydrate

iron(II) chloride tetrahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

C24H26Cl2FeN2

C24H26Cl2FeN2

Conditions
ConditionsYield
With acetic acid for 3h; Inert atmosphere; Reflux;70.3%
With acetic acid for 3h; Inert atmosphere; Reflux;70.3%
nickel(II) chloride hexahydrate

nickel(II) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2-propyl-2,3-dihydroacridine-4-one

2-propyl-2,3-dihydroacridine-4-one

4-(2,6-diethyl-4-methylphenylimino)-2-propyl-1,3-dihydroacridine nickel dichloride

4-(2,6-diethyl-4-methylphenylimino)-2-propyl-1,3-dihydroacridine nickel dichloride

Conditions
ConditionsYield
With acetic acid for 5h; Reflux;70%
chromium(III) chloride hexahydrate

chromium(III) chloride hexahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

α,α’-dioxo-2,3 : 5,6-bis(pentamethylene)pyridine
96413-29-5

α,α’-dioxo-2,3 : 5,6-bis(pentamethylene)pyridine

C37H47Cl3CrN3

C37H47Cl3CrN3

Conditions
ConditionsYield
In acetic acid for 3h; Reflux; Inert atmosphere; Schlenk technique;70%
2-((2,6-dibenzhydryl-4-chlorophenyl)imino)acenaphthylen-1-one
1396115-05-1

2-((2,6-dibenzhydryl-4-chlorophenyl)imino)acenaphthylen-1-one

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2,6-dibenzhydryl-N-(2-(2,6-diethyl-4-methylphenylimino)acenaphthylenylidne)-4-chlorobenzenamine

2,6-dibenzhydryl-N-(2-(2,6-diethyl-4-methylphenylimino)acenaphthylenylidne)-4-chlorobenzenamine

Conditions
ConditionsYield
With toluene-4-sulfonic acid In toluene at 120℃;69%
2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2-benzoyl-5,6,7,8-tetrahydro cyclohepta[b]pyridin-9-one

2-benzoyl-5,6,7,8-tetrahydro cyclohepta[b]pyridin-9-one

iron(II) chloride

iron(II) chloride

C39H45Cl2FeN3

C39H45Cl2FeN3

Conditions
ConditionsYield
With acetic acid for 6h; Inert atmosphere; Reflux;68.4%
1-quinolin-2-yl-ethanone
1011-47-8

1-quinolin-2-yl-ethanone

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

2,6-diethyl-4-methyl-N-(1-(quinolin-2-yl)ethylidene) benzenamine
1319733-82-8

2,6-diethyl-4-methyl-N-(1-(quinolin-2-yl)ethylidene) benzenamine

Conditions
ConditionsYield
With toluene-4-sulfonic acid In toluene for 12h; Reflux;68%
iron(II) chloride tetrahydrate

iron(II) chloride tetrahydrate

2,6-diethyl-4-methylaniline
24544-08-9

2,6-diethyl-4-methylaniline

α,α’-dioxo-2,3 : 5,6-bis(pentamethylene)pyridine
96413-29-5

α,α’-dioxo-2,3 : 5,6-bis(pentamethylene)pyridine

C37H47Cl2FeN3

C37H47Cl2FeN3

Conditions
ConditionsYield
With acetic acid In acetic acid at 120℃; for 4h; Inert atmosphere;67.5%

24544-08-9Relevant articles and documents

Process for the isolation of alkylated aromatic amines

-

, (2008/06/13)

Alkylated aromatic amines can be isolated from crude catalyst-containing mixtures of these with olefins by a procedure in which in general equivalent amounts of an inorganic base and water are added to the alkylation mixture, the catalyst is hydrolysed, the water present in the reaction mixture after the hydrolysis is removed by distillation and the solid catalyst residue is separated off. The catalyst-free alkylation mixture which remains is then fed to customary further working up.

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