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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Phthalic, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Phthalic impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Phthalic-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Phthalic Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"1,2,3,6-Tetrahydrophthalic Anhydride-3,3,4,5,6,6-D6" Stable Isotopes CS-T-61858 89614-23-3 Enquire
"Phthalic Acid Bis(3,7-dimethyloctyl) Ester-d4" Stable Isotopes CS-T-84050 1398065-81-0 Enquire
1-Methylcyclohexylphthalic Acid Ester-d4 Stable Isotopes CS-T-98038 Not Available Enquire
3-Methoxyphthalic-d3 Acid Stable Isotopes CS-T-96702 Not Available Enquire
Isophthalic-2,4,5,6-d4 Acid Stable Isotopes CS-C-00011 148472-48-4 Enquire
Phthalic Acid (Phenyl-13C6, D4) Stable Isotopes CS-T-97913 88-99-3 (Unlabelled) Enquire
Phthalic Acid 1-(1,2-dimethylpropyl) Ester-d4 Stable Isotopes CS-T-97911 Not Available Enquire
Phthalic Acid Anhydride-13C2 Stable Isotopes CS-T-84307 1239918-30-9 Enquire
Phthalic Acid Bis(1,2-dimethylpropyl) Ester-d4 Stable Isotopes CS-T-97909 Not Available Enquire
Phthalic Acid Cyclohexyl Isobutyl Ester-d4 Stable Isotopes CS-T-97908 Not Available Enquire
Phthalic Acid-13C2 Stable Isotopes CS-T-84166 254110-94-6 Enquire
Phthalic Acid-d4 1-Ethylpropyl Ester Stable Isotopes CS-T-97910 Not Available Enquire
Phthalic Anhydride (Phenyl-13C6, D4) Stable Isotopes CS-T-97912 Not Available Enquire
Phthalic-13C6 Acid Stable Isotopes CS-T-84812 1313734-99-4 Enquire
Phthalic-13C6 Anhydride Stable Isotopes CS-T-84527 1173019-01-6 Enquire
Terephthalic Acid-13C8 Stable Isotopes CS-T-87075 1794767-08-0 Enquire
Tetrabromophthalic Acid-13C6 Stable Isotopes CS-T-97889 Not Available Enquire
Tetrabromophthalic Anhydride-13C6 Stable Isotopes CS-T-102645 632-79-1(Unlabelled) Enquire


API Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
Terephthalic Acid API Standards CS-T-43341 100-21-0 In Stock


Impurities

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"cis-1,2,3,6-Tetrahydrophthalic Anhydride" Impurities CS-T-87079 935-79-5 Enquire
1,2,3,6-Tetrahydro-3,6-methanophthalic anhydride Impurities CS-DL-00935 826-62-0 Enquire
2,6-Dichloroterephthalic Acid Impurities CS-T-17797 116802-97-2 Enquire
3-(hydroxyamino)phthalic acid Impurities CS-O-39597 202262-76-8 Enquire
3-Methoxyphthalic Acid Impurities CS-T-32840 14963-97-4 Enquire
3-Nitrophthalic Acid Impurities CS-T-59602 603-11-2 In Stock
4-Acetoxyisophthalic Acid Impurities CS-T-01224 5985-26-2 Enquire
4-Chloroisophthalic acid Impurities CS-M-26632 2845-85-4 Enquire
4-Methylphthalic anhydride Impurities CS-DV-02883 19438-61-0 In Stock
4-Nitrophthalic Anhydride Impurities CS-T-37130 5466-84-2 Enquire
5-Methoxyisophthalic Acid Impurities CS-T-29821 46331-50-4 In Stock
cis-4-Methyl-1,2-3,6-tetrahydrophthalic Anhydride Impurities CS-T-35161 1694-82-2 Enquire
Hexahydrophthalic acid Impurities CS-T-95908 1687-30-5 Enquire
Homophthalic anhydride Impurities CS-T-79675 703-59-3 Enquire
Methylhexahydrophthalic anhydride Impurities CS-CF-00012 25550-51-0 Enquire
Phthalic Acid 4,5-cis-Dihydrodiol Impurities CS-T-84762 130073-64-2 Enquire
Phthalic Acid Cyclohexyl Isobutyl Ester Impurities CS-T-60555 Not Available Enquire
Terephthalic acid monoamide Impurities CS-M-07499 6051-43-0 Enquire
Tetrachlorophthalic acid Impurities CS-DL-00969 632-58-6 Enquire


Intermediates

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
"1,2,3,6-Tetrahydrophthalic Anhydride" Intermediates CS-T-86295 85-43-8 Enquire
"2,3-Naphthalic Anhydride" Intermediates CS-T-59096 716-39-2 Enquire
"2,5-Dibromoterephthalic acid" Intermediates CS-DV-01314 13731-82-3 Enquire
"2,5-Dimethylterephthalic acid" Intermediates CS-AC-08197 6051-66-7 Enquire
"3,6-Dichlorophthalic acid" Intermediates CS-BO-00014 16110-99-9 Enquire
"3,6-Dichlorophthalic anhydride" Intermediates CS-BO-00015 4466-59-5 Enquire
"3,6-Dinitronaphthalic Anhydride" Intermediates CS-T-53722 3807-80-5 Enquire
"3-Bromo-1,8-naphthalic Anhydride" Intermediates CS-T-49827 24050-49-5 Enquire
"4-(2,5-Dioxo-2,5-dihydropyrrol-1-yl)phthalic acid" Intermediates CS-AC-08729 56896-91-4 Enquire
"4,5-Dichlorophthalic anhydride" Intermediates CS-AC-08349 942-06-3 Enquire
"4,5-Difluorophthalic anhydride" Intermediates CS-AC-09122 18959-30-3 Enquire
"4,5-epoxytetrahydrophthalic acid diglycidylester" Intermediates CS-CF-00004 25293-64-5 Enquire
"4-Sulfo-1,8-naphthalic anhydride potassium salt" Intermediates CS-AC-11784 71501-16-1 Enquire
"5-(2-Chloroacetamido)-2,4,6-triiodo-isophthalic Acid" Intermediates CS-T-11034 4873-45-4 Enquire
"Phthalic Acid 1-(1,2-dimethylpropyl) Ester" Intermediates CS-T-39873 198284-10-5 Enquire
α-propargylhomoterephthalic acid dimethyl ester Intermediates CS-CS-00021 146464-90-6 Enquire
1-Methylcyclohexylphthalic Acid Ester Intermediates CS-T-58067 960-24-7 Enquire
2-(1H-pyrrol-1-yl)terephthalic acid Intermediates CS-ED-30331 1040713-41-4 Enquire
2-(1H-tetrazol-1-yl)terephthalic acid Intermediates CS-ED-30332 1010915-67-9 Enquire
2,5-Diaminoterephthalic acid Intermediates CS-ED-26138 945-30-2 Enquire
2,5-Dianilinoterephthalic acid Intermediates CS-CD-00046 10109-95-2 Enquire
2-Amino-5-iodoisophthalic acid Intermediates CS-ED-35417 907574-30-5 Enquire
2-Aminoterephthalic acid Intermediates CS-EL-04545 10312-55-7 Enquire
2-Bromo-5-chloroterephthalic acid Intermediates CS-ED-14999 500550-60-7 Enquire
2-Bromo-5-fluoro-3,6-dimethylterephthalic acid Intermediates CS-ED-14972 1555757-16-8 Enquire
2-Bromoterephthalic acid Intermediates CS-AC-07136 586-35-6 Enquire
2-fluoro-isophthalic acid Intermediates CS-DV-01719 1583-65-9 Enquire
2-Hydroxyterephthalic acid Intermediates CS-M-57568 636-94-2 Enquire
2-Hydroxy-terephthalic acid dimethyl ester Intermediates CS-M-43566 6342-72-9 Enquire
2-methoxy-isophthalic acid Intermediates CS-DV-01776 1951-38-8 Enquire
2-Nitroisophthalic acid Intermediates CS-M-42555 21161-11-5 Enquire
2-Nitroisophthalic Acid Monomethyl Ester Intermediates CS-DJ-00744 861593-27-3 Enquire
3,4,6-Trichlorophthalic Acid Intermediates CS-T-86503 62268-16-0 Enquire
3,4-dichlorophthalic Acid Intermediates CS-O-41127 56962-06-2 Enquire
3,6-DIFLUOROPHTHALIC ACID Intermediates CS-BO-00004 651-97-8 Enquire
3-Aminophthalic Acid Hydrochloride Intermediates CS-BX-00460 6946-22-1 In Stock
3-Aminophthalic Acid Hydrochloride Dihydrate Intermediates CS-ED-08160 1852533-96-0 In Stock
3-Bromophthalic acid Intermediates CS-AC-07577 116-69-8 Enquire
3-Bromophthalic anhydride Intermediates CS-AC-07639 82-73-5 Enquire
3-Hydroxyphthalic Anhydride Intermediates CS-DV-02303 37418-88-5 Enquire
3-Methylhexahydrophthalic Anhydride Intermediates CS-T-82402 57110-29-9 Enquire
3-Nitrophthalic anhydride Intermediates CS-M-57839 641-70-3 In Stock
4-(4-Fluorobenzoyl)isophthalic Acid Intermediates CS-T-23917 1645-24-5 Enquire
4-(Acetylamino)phthalic anhydride Intermediates CS-ED-00286 22235-04-7 Enquire
4-Amino-1,8-naphthalic anhydride Intermediates CS-ED-06916 6492-86-0 Enquire
4-Amino-3,6-disulfo-1,8-naphthalic anhydride dipotassium sal... Intermediates CS-ED-11916 79539-35-8 Enquire
4-Aminophthalic acid Intermediates CS-EL-07997 5434-21-9 Enquire
4-Boronophthalic acid Intermediates CS-AC-06503 1072946-35-0 Enquire
4-Bromo-1,8-naphthalic anhydride Intermediates CS-T-70094 81-86-7 Enquire
4-Bromoisophthalic acid Intermediates CS-AC-07855 6939-93-1 Enquire
4-Bromophthalic acid Intermediates CS-M-57654 6968-28-1 Enquire
4-Bromophthalic Anhydride Intermediates CS-DJ-00810 86-90-8 Enquire
4-Chlorophthalic acid Intermediates CS-T-72727 89-20-3 Enquire
4-Methoxyphthalic acid Intermediates CS-M-55854 1885-13-8 Enquire
4-Nitroisophthalic acid Intermediates CS-M-42556 4315-09-7 Enquire
5-(1H-pyrrol-1-yl)isophthalic acid Intermediates CS-ED-30333 944894-38-6 Enquire
5-(2-Aminoacetamido)-2,4,6-triiodo-isophthalic Acid Intermediates CS-T-01851 4873-46-5 Enquire
5-Aminoisophthalic Acid Monomethyl Ester Intermediates CS-T-65698 28179-47-7 Enquire
5-Aminoisophthalicacid Intermediates CS-CJ-00106 99-31-0 Enquire
5-Bromo-4-chloroisophthalic Acid Intermediates CS-T-68436 191227-53-9 Enquire
5-Bromoisophthalic acid Intermediates CS-T-67155 23351-91-9 Enquire
5-Fluoroisophthalic acid Intermediates CS-O-49763 1583-66-0 Enquire
5-Formyl-isophthalic acid monomethyl ester Intermediates CS-DU-00107 914220-93-2 Enquire
5-Hydrazinoisophthalic acid hydrochloride Intermediates CS-ED-40735 873773-66-1 Enquire
5-Hydroxyisophthalic acid Intermediates CS-M-57723 618-83-7 Enquire
5-Methylisophthalic acid Intermediates CS-M-58374 499-49-0 Enquire
Hexahydro-4-methylphthalic Anhydride Intermediates CS-T-78787 19438-60-9 Enquire
Isophthalic Acid Intermediates CS-EP-00273 121-91-5 In Stock
Phthalic Acid Intermediates CS-T-39867 88-99-3 In Stock
Phthalic Acid 1-Ethylpropyl Ester Intermediates CS-T-39878 106477-98-9 Enquire
Phthalic Acid 8-Methylnonyl Ester Intermediates CS-T-39875 69725-01-5 Enquire
Phthalic Acid Mono-tetrahydrogeranyl Ester Intermediates CS-T-84472 297182-84-4 Enquire
Phthalic anhydride-4-boronic acid pinacol ester Intermediates CS-AC-06669 849677-21-0 Enquire
Phthalic Hydrazide Intermediates CS-T-39880 1445-69-8 In Stock
Terephthalic Acid Mono(2-bromoethyl) Ester Intermediates CS-T-43345 173550-97-5 Enquire
Tetrabromophthalic Acid Intermediates CS-T-43492 13810-83-8 Enquire
Tetrabromophthalic Anhydride Intermediates CS-T-43493 632-79-1 Enquire
Tetrachlorophthalic Anhydride Intermediates CS-T-43556 117-08-8 Enquire
Tetrafluorophthalic acid Intermediates CS-M-02832 652-03-9 Enquire
Tetrafluorophthalic anhydride Intermediates CS-M-04861 652-12-0 Enquire
tetrahydrophthalic acid diglycidylester Intermediates CS-CF-00003 21544-03-6 Enquire


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Aminoisophthalic acid Fine Chemicals CS-M-03247 39622-79-2 Enquire
2-Chloroisophthalic acid Fine Chemicals CS-MM-55939 13049-16-6 Enquire
3- Acetamidophthalic anhydride Fine Chemicals CS-MO-36397 6296-53-3 In Stock
3-Acetamidophthalic Anhydride Fine Chemicals CS-T-47149 6296-53-3 In Stock
3-Acetylamidophthalic anhydride Fine Chemicals CS-O-58674 2704428-08-8 Enquire
3-Fluorophthalic acid Fine Chemicals CS-M-01762 1583-67-1 Enquire
3-Fluorophthalic anhydride Fine Chemicals CS-M-01763 652-39-1 Enquire
4,5-Dichlorophthalic acid Fine Chemicals CS-BX-00770 56962-08-4 Enquire
4,5-Difluorophthalic acid Fine Chemicals CS-MM-26870 18959-31-4 Enquire
4-Nitrophthalic Acid Fine Chemicals CS-T-37128 610-27-5 In Stock
4-tert-Butylphthalic Anhydride Fine Chemicals CS-T-71027 32703-79-0 Enquire
Phthalic Anhydride Fine Chemicals CS-T-39870 85-44-9 In Stock
Terephthalic acid, cyclic ethylene oxydiethylene ester Fine Chemicals CS-O-58760 29278-57-7 Enquire


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-Chlorophthalic acid Building Blocks CS-ZG-95036 27563-65-1 Enquire
4-Hydroxyphthalic acid Building Blocks CS-M-58419 610-35-5 In Stock
4-Methylphthalic Acid Building Blocks CS-O-52618 4316-23-8 Enquire
4-Phenoxyphthalic acid Building Blocks CS-ED-01236 37951-15-8 Enquire
5-Chloroisophthalic Acid Building Blocks CS-T-93985 2157-39-3 Enquire


Pesticide Standards

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2,3,5,6-Tetrachloroterephthalic Acid Pesticide Standards CS-T-87274 2136-79-0 Enquire