Pharmaceutical Materials

Methyl tetrahydrophthalic anhydride CAS No.19438-64-3

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Introduction

CAS No.19438-64-3

Names and Identifiers

Name	3a-methyl-5,6-dihydro-4H-isobenzofuran-1,3-dione
Synonyms	MTHPA AC-METHYL 1,3-Isobenzofurandione, 3a,4 tetrahydromethylphthalic anhydride Methyltetrahydrophthalic anhydride 4-METHYL TETRAHYDROPHTHALIC ANHYDRIDE 4-Methyl tetrahydro phthalic anhydride Tetrahydromethyl-1,3-isobenzofurandione 1,3-Isobenzofurandione, tetrahydromethyl 1,3-Isobenzofurandione, tetrahydromethyl- 3-METHYL-DELTA4-TETRAHYDROPHTHALIC ANHYDRIDE 3-METHYL-4-CYCLOHEXEN-1,2-DICARBOXYLIC ANHYDRIDE 3a-methyl-5,6-dihydro-4H-isobenzofuran-1,3-dione 3-METHYL-4-CYCLOHEXENE-1,2-DICARBOXYLIC ANHYDRIDE 3a-methyl-3a,4,5,6-tetrahydro-2-benzofuran-1,3-dione 7a-methyl-3a,4,5,7a-tetrahydro-2-benzofuran-1,3-dione 4-methyl-3a,4,7,7a-tetrahydroisobenzofuran-1,3-quinone cis,cis-3-Methyl-4-cyclohexene-1,2-dicarboxylic acid anhydride
CAS	11070-44-3 19438-64-3
EINECS	234-290-7
InChI	InChI=1/C9H10O3/c1-9-5-3-2-4-6(9)7(10)12-8(9)11/h3,5-6H,2,4H2,1H3

Physico-chemical Properties

Molecular Formula	C9H10O3
Molar Mass	166.17
Density	1,21 g/cm3
Boling Point	120 °C/3 mmHg
Flash Point	157 °C
Water Solubility	Soluble in water
Vapor Presure	0.373Pa at 24.85℃
Appearance	Liquid
Color	Colorless to Light yellow
Storage Condition	Room Temprature
Refractive Index	1.4970 to 1.5020
MDL	MFCD00014585
Use	For unsaturated polyester resin, epoxy resin curing agent, pesticide intermediates, dry-type transformer potting

Risk and Safety

Hazard Symbols	Xn – Harmful
Risk Codes	R36/37/38 – Irritating to eyes, respiratory system and skin. R42/43 – May cause sensitization by inhalation and skin contact. R41 – Risk of serious damage to eyes
Safety Description	S26 – In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. S36/37/39 – Wear suitable protective clothing, gloves and eye/face protection. S37/39 – Wear suitable gloves and eye/face protection S24 – Avoid contact with skin. S22 – Do not breathe dust.
UN IDs	UN 3082 9/PG III
RTECS	TI3325000
Hazard Class	9
Packing Group	III

Upstream Downstream Industry

Raw Materials

Maleic anhydride

Reference Information

LogP	2.45 at 20℃
EPA chemical information	Information provided by: ofmpub.epa.gov (external link)
use	methyl tetrahydrophthalic anhydride is an excellent organic solvent with a wide range of uses, mainly used in electronics, medicine, dyes, spices, cosmetics, paints, coatings, inks, electroplating and other industries.

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