Tolualdehyde

from Wikipedia, the free encyclopedia
Tolualdehyde
Surname 2-tolualdehyde 3-tolualdehyde 4-tolualdehyde
other names o -Tolualdehyde,
2-methylbenzaldehyde 		m -Tolualdehyde,
3-methylbenzaldehyde 		p -Tolualdehyde,
4-methylbenzaldehyde
Structural formula Structure of 2-methylbenzaldehyde Structure of 3-methylbenzaldehyde Structure of 4-methylbenzaldehyde
CAS number 529-20-4 620-23-5 104-87-0
PubChem 10722 12105 7725
Molecular formula C 8 H 8 O
Molar mass 120.15 g mol −1
Physical state liquid
Melting point −35 ° C - −6 ° C
boiling point 198-200 ° C 199 ° C 204 ° C
GHS
labeling
07 - Warning
Caution
no GHS pictograms
07 - Warning
Caution
H and P phrases 302-315-319-335 no H-phrases 302
no EUH phrases no EUH phrases no EUH phrases
261-280-302 + 352-305 + 351 + 338
304 + 340-405-501 		no P-phrases 262

In chemistry, tolualdehydes form a group of substances that are derived from both benzaldehyde and toluene . The structure consists of a benzene ring with attached aldehyde  (-CHO) and methyl groups  (-CH 3 ) as substituents . Their different arrangement results in three constitutional isomers with the empirical formula C 8 H 8 O. They are mainly to be regarded as methyl-substituted benzaldehydes.

presentation

4-Tolualdehyde 2 can be prepared by Friedel-Crafts acylation of toluene 1 with carbon monoxide and hydrogen chloride under Gattermann-Koch conditions .

Gattermann-Koch synthesis of 4-tolualdehyde

See also

Individual evidence

  1. ↑ a b c Entry for CAS no. 529-20-4 in the GESTIS substance database of the IFA , accessed on March 25, 2017(JavaScript required) .
  2. ↑ a b Entry for CAS no. 620-23-5 in the GESTIS substance database of the IFA , accessed on March 25, 2017(JavaScript required) .
  3. ↑ a b c Entry for CAS no. 104-87-0 in the GESTIS substance database of the IFA , accessed on March 25, 2017(JavaScript required) .
  4. ^ GH Coleman, David Craig: p-Tolualdehyde In: Organic Syntheses . 12, 1932, p. 80, doi : 10.15227 / orgsyn.012.0080 ; Coll. Vol. 2, 1943, p. 583 ( PDF ).