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Product Name: Palmitic acid
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Dayang Chem (Hangzhou) Co., Ltd.
China
Product Name: 2H-Pyran-2-carboxaldehyde,3,4-dihydro-2,5-dimethyl-
Price: $Inquiry/100g $Inquiry/1kg $Inquiry/100kg $Inquiry/1000kg
Purity: 98.0%
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1920-21-4

1920-21-4 structure

1920-21-4 structure

Name: 2H-Pyran-2-carboxaldehyde,3,4-dihydro-2,5-dimethyl-
Chemical Name: 2,5-dimethyl-3,4-dihydropyran-2-carbaldehyde
CAS Number: 1920-21-4
Molecular Formula: C₈H₁₂O₂
Molecular Weight: 140.18000
Create Date: 2016-08-06 15:52:46
Modify Date: 2025-08-25 19:48:55

Name	2,5-dimethyl-3,4-dihydropyran-2-carbaldehyde
Synonyms	2H-Pyran-2-carboxaldehyde,3,4-dihydro-2,5-dimethyl Methacrylaldehyde dimer 2,5-dimethyl-3,4-dihydro-2H-pyran-2-carbaldehyde 3,4-dihydro-2,5-dimethyl-2H-pyran-2-carboxaldehyde 3,4-Dihydro-2,5-dimethyl-2H-pyran-2-carbaldehyde Methacrolein dimer 1,4-Pyran,2,3-dihydro-2,5-dimethyl-2-formyl 2,3-Dihydro-2,5-dimethyl-2-formyl-1,4-pyran EINECS 217-647-1

Density	1.047g/cm3
Boiling Point	201.4ºC at 760 mmHg
Molecular Formula	C₈H₁₂O₂
Molecular Weight	140.18000
Flash Point	74.1ºC
Exact Mass	140.08400
PSA	26.30000
LogP	1.65820
Vapour Pressure	0.308mmHg at 25°C
Index of Refraction	1.512

CHEMICAL IDENTIFICATION

RTECS NUMBER :: UP7875000

CHEMICAL NAME :: 1,4-Pyran, 2,3-dihydro-2,5-dimethyl-2-formyl-

CAS REGISTRY NUMBER :: 1920-21-4

BEILSTEIN REFERENCE NO. :: 0114546

LAST UPDATED :: 199806

DATA ITEMS CITED :: 3

MOLECULAR FORMULA :: C8-H12-O2

MOLECULAR WEIGHT :: 140.20

WISWESSER LINE NOTATION :: T6O BUTJ C1 FVH F1

HEALTH HAZARD DATA

ACUTE TOXICITY DATA

TYPE OF TEST :: Standard Draize test

ROUTE OF EXPOSURE :: Administration onto the skin

SPECIES OBSERVED :: Rodent - rabbit

REFERENCE :: 85JCAE "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986 Volume(issue)/page/year: -,803,1986

TYPE OF TEST :: Standard Draize test

ROUTE OF EXPOSURE :: Administration into the eye

SPECIES OBSERVED :: Rodent - rabbit

REFERENCE :: 85JCAE "Prehled Prumyslove Toxikologie; Organicke Latky," Marhold, J., Prague, Czechoslovakia, Avicenum, 1986 Volume(issue)/page/year: -,803,1986 ** ACUTE TOXICITY DATA **

TYPE OF TEST :: LD50 - Lethal dose, 50 percent kill

ROUTE OF EXPOSURE :: Oral

SPECIES OBSERVED :: Rodent - rat

DOSE/DURATION :: 2460 mg/kg

TOXIC EFFECTS :: Details of toxic effects not reported other than lethal dose value

REFERENCE :: AMIHBC AMA Archives of Industrial Hygiene and Occupational Medicine. (Chicago, IL) V.2-10, 1950-54. For publisher information, see AEHLAU. Volume(issue)/page/year: 10,61,1954

108-31-6 structure

108-31-6

78-85-3 structure

78-85-3

~9%

1920-21-4 structure

1920-21-4

Literature: Zhu, Zuolin; Espenson, James H. Journal of the American Chemical Society, 1997 , vol. 119, # 15 p. 3507 - 3512

78-85-3 structure

78-85-3

~89%

1920-21-4 structure

1920-21-4

Literature: Karpiak; Marshalok; Fedevich; Avdosieva; Kovalskyi, Ya. P. Chemistry of Heterocyclic Compounds, 2008 , vol. 44, # 11 p. 1334 - 1338

107-25-5 structure

107-25-5

78-85-3 structure

78-85-3

~%

38328-65-3 structure

38328-65-3

1920-21-4 structure

1920-21-4

Literature: Srivastava; Pavao; Seabra; Brown Journal of Molecular Structure, 1997 , vol. 412, # 1-2 p. 51 - 58

Precursor 3
108-31-6 78-85-3 107-25-5
DownStream 6
78-85-3 10171-73-0 54004-34-1 13434-06-5
6970-59-8 72251-43-5

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