The 1,3-Isobenzofurandione,5,6-dichloro-, with the CAS registry number 942-06-3 and EINECS registry number 213-386-2, has the systematic name of 5,6-dichloro-2-benzofuran-1,3-dione. It is a kind of light grey to pale blue powder, and belongs to the following product categories: Anhydride Monomers; Monomers; Polymer Science. And the molecular formula of the chemical is C₈H₂Cl₂O₃.

The characteristics of 1,3-Isobenzofurandione,5,6-dichloro- are as followings: (1)ACD/LogP: 2.67; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 2.66; (4)ACD/LogD (pH 7.4): 2.66; (5)ACD/BCF (pH 5.5): 62.43; (6)ACD/BCF (pH 7.4): 62.43; (7)ACD/KOC (pH 5.5): 671.04; (8)ACD/KOC (pH 7.4): 671.04; (9)#H bond acceptors: 3; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 0; (12)Polar Surface Area: 43.37 Å²; (13)Index of Refraction: 1.638; (14)Molar Refractivity: 45.47 cm³; (15)Molar Volume: 126.4 cm³; (16)Polarizability: 18.02×10^-24cm³; (17)Surface Tension: 63.7 dyne/cm; (18)Density: 1.715 g/cm³; (19)Flash Point: 144.8 °C; (20)Enthalpy of Vaporization: 55.4 kJ/mol; (21)Boiling Point: 313 °C at 760 mmHg; (22)Vapour Pressure: 0.00051 mmHg at 25°C.

Preparation of 1,3-Isobenzofurandione,5,6-dichloro-: This chemical can be prepared by 4,5-dichloro-phthalic acid. The reaction will need reagent acetic anhydride. The reaction time is 0.5 hours with heating, and the yield is about 92%. 

Uses of 1,3-Isobenzofurandione,5,6-dichloro-: It can react with methylamine; hydrochloride to produce 5,6-dichloro-2-methyl-isoindole-1,3-dione. This reaction will need reagent NaOAc, and the menstruum acetic acid. The reaction time is 1 hour with heating, and the yield is about 91%.  

You should be cautious while dealing with this chemical. It irritates to eyes, respiratory system and skin. Therefore, you had better take the following instructions: Wear suitable gloves and eye/face protection, and if in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice. 

Addtionally, the following datas could be converted into the molecular structure:
(1)SMILES: Clc1cc2C(=O)OC(=O)c2cc1Cl
(2)InChI: InChI=1/C8H2Cl2O3/c9-5-1-3-4(2-6(5)10)8(12)13-7(3)11/h1-2H
(3)InChIKey: ULSOWUBMELTORB-UHFFFAOYAF