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91-08-7

Basic Information
CAS No.: 91-08-7
Name: 2-METHYL-M-PHENYLENE DIISOCYANATE
Article Data: 19
Molecular Structure:
Molecular Structure of 91-08-7 (2-METHYL-M-PHENYLENE DIISOCYANATE)
Formula: C9H6N2O2
Molecular Weight: 174.159
Synonyms: Isocyanicacid, 2-methyl-m-phenylene ester (8CI);2,6-Diisocyanatotoluene;2,6-TDI;2-Methyl-m-phenylene isocyanate;Toluene2,6-diisocyanate;Tolulene-2,6-diisocyanate;Tolylene 2,6-diisocyanate;m-Tolylene diisocyanate;2,6-Diisocyanato-1-methylbenzene;
EINECS: 202-039-0
Density: 1.146 g/cm3
Melting Point: 13 °C
Boiling Point: 248.424 °C at 760 mmHg
Flash Point: 110.462 °C
Solubility: It hydrolyzes in water.
Appearance: colourless liquid
Hazard Symbols: VeryT+
Risk Codes: 26-36/37/38-40-42/43-52/53
Safety: 23-36/37-45-61
Transport Information: UN 2078 6.1/PG 2
PSA: 58.86000
LogP: 1.92960
Downstream Products
823-40-5
7440-44-0
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Consensus Reports

IARC Cancer Review: Group 2B IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 7 ,1987,p. 56.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Human Inadequate Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 39 ,1986,p. 287.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) ; Animal Sufficient Evidence IMEMDT    IARC Monographs on the Evaluation of Carcinogenic Risk of Chemicals to Man . 39 ,1986,p. 287.(World Health Organization, Internation Agency for Research on Cancer,Lyon, France.: ) (Single copies can be ordered from WHO Publications Centre U.S.A., 49 Sheridan Avenue, Albany, NY 12210) . Reported in EPA TSCA Inventory. Community Right-To-Know List. EPA Hazardous Substances List. EPA Extremely Hazardous Substances List.

Standards and Recommendations

ACGIH TLV: TWA 0.005 ppm; STEL 0.02 ppm; Not Classifiable as a Human Carcinogen; (Proposed: TWA 0.005 ppm; STEL 0.02 ppm (sensitizer); Not Classifiable as a Human Carcinogen)
DFG MAK: 0.01 ppm (0.072 mg/m3)
NIOSH REL: (Diisocyanates) TWA 0.005 ppm; CL 0.02 ppm/10M
DOT Classification:  6.1; Label: KEEP AWAY FROM FOOD (UN 2207); DOT Class: 6.1; Label: Poison (UN 2206); DOT Class: 6.1; Label: Poison, Flammable Liquid (UN 3080); DOT Class: 3; Label: Flammable Liquid, Poison (UN 2478)

Analytical Methods

For occupational chemical analysis use OSHA: #42.

Specification

The 2,6-Toluene diisocyanate, with the CAS registry number 70-78-0, is also known as 2,6-Diisocyanato-1-methylbenzene. Its EINECS number is 200-744-8. This chemical's molecular formula is C9H6N2O2 and molecular weight is 174.16. What's more, its systematic name is 1,3-Diisocyanato-2-methylbenzene. Its classification codes are: (1)Human Data; (2)Mutation data; (3)Tumor data.

Physical properties of 2,6-Toluene diisocyanate are: (1)ACD/LogP: 3.379; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 3.38; (4)ACD/LogD (pH 7.4): 3.38; (5)ACD/BCF (pH 5.5): 217.96; (6)ACD/BCF (pH 7.4): 217.96; (7)ACD/KOC (pH 5.5): 1642.14; (8)ACD/KOC (pH 7.4): 1642.14; (9)#H bond acceptors: 4; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 58.86 Å2; (13)Index of Refraction: 1.559; (14)Molar Refractivity: 49.098 cm3; (15)Molar Volume: 152.028 cm3; (16)Polarizability: 19.464×10-24cm3; (17)Surface Tension: 43.5 dyne/cm; (18)Density: 1.146 g/cm3; (19)Flash Point: 110.462 °C; (20)Enthalpy of Vaporization: 48.562 kJ/mol; (21)Boiling Point: 248.424 °C at 760 mmHg; (22)Vapour Pressure: 0.02 mmHg at 25°C.

Uses of 2,6-Toluene diisocyanate: it can be used to produce 2-bromomethyl-m-phenylene diisocyanate by heating. It will need reagent N-bromosuccinimide with the reaction time of 2 hours. The yield is about 56%.

2,6-Toluene diisocyanate can be used to produce 2-bromomethyl-m-phenylene diisocyanate by heating

When you are using this chemical, please be cautious about it as the following:
This chemical is very toxic by inhalation. It is irritating to eyes, respiratory system and skin. It has a limited evidence of a carcinogenic effect and may cause sensitisation by inhalation and skin contact. This chemical is harmful to aquatic organisms as it may cause long-term adverse effects in the aquatic environment. You should not breathe gas/fumes/vapour/spray (appropriate wording to be specified by the manufacturer). When using it, you need wear suitable protective clothing and gloves. In case of accident or if you feel unwell, you must seek medical advice immediately (show the label where possible). You should avoid releasing it to the environment, and you must refer to special instructions/safety data sheet.

You can still convert the following datas into molecular structure:
(1)SMILES: O=C=N\c1cccc(\N=C=O)c1C
(2)Std. InChI: InChI=1S/C9H6N2O2/c1-7-8(10-5-12)3-2-4-9(7)11-6-13/h2-4H,1H3
(3)Std. InChIKey: RUELTTOHQODFPA-UHFFFAOYSA-N

The toxicity data is as follows:  

Organism Test Type Route Reported Dose (Normalized Dose) Effect Source
bird - wild LD50 oral 100mg/kg (100mg/kg)   Archives of Environmental Contamination and Toxicology. Vol. 12, Pg. 355, 1983.
human TCLo inhalation 50ppb (.05ppm) LUNGS, THORAX, OR RESPIRATION: OTHER CHANGES

SENSE ORGANS AND SPECIAL SENSES: OTHER CHANGES: OLFACTION

SENSE ORGANS AND SPECIAL SENSES: OTHER: EYE
Archiv fuer Toxikologie. Vol. 19, Pg. 364, 1962.