The IUPAC name of 6-Hexanolactone is oxepan-2-one. With the CAS registry number 502-44-3, it is also named as Hexamethylene oxide, 2-oxo-. The product's categories are Lactones & Lactides (for High-Performance Polymer Research); Functional Materials; Reagent for High-Performance Polymer Research. It is clear colorless liquid, yellowing on ageing which is unstable, flammable, aggregation and miscible with most organic solvents. It can not contact with inorganic acids, organic acids, alkali, acid, alkaline salts, water, steam, copper and zinc when storing. Additionally, the container should be filled with nitrogen.

The other characteristics of this product can be summarized as: (1)ACD/LogP: 0.42; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 0.422; (4)ACD/LogD (pH 7.4): 0.422; (5)ACD/BCF (pH 5.5): 1.233; (6)ACD/BCF (pH 7.4): 1.233; (7)ACD/KOC (pH 5.5): 40.437; (8)ACD/KOC (pH 7.4): 40.437; (9)#H bond acceptors: 2; (10)#H bond donors: 0; (11)#Freely Rotating Bonds: 0; (12)Index of Refraction: 1.439; (13)Molar Refractivity: 29.406 cm³; (14)Molar Volume: 111.733 cm³; (15)Polarizability: 11.658×10^-24 cm³; (16)Surface Tension: 32.219 dyne/cm; (17)Enthalpy of Vaporization: 46.191 kJ/mol; (18)Vapour Pressure: 0.087 mmHg at 25°C; (19)Tautomer Count: 2; (20)Exact Mass: 114.06808; (21)MonoIsotopic Mass: 114.06808; (22)Topological Polar Surface Area: 26.3; (23)Heavy Atom Count: 8; (24)Complexity: 88.5.

Preparation of 6-Hexanolactone: Using acetaldehyde as raw materials and ethyl acetate as solvent. First, peracetic acid (Ⅰ)can be obtained by oxidation of ozone. And then, Ⅰ react with cyclohexanone to get crude product. After vacuum distillation, we can get the qualified product.

2CH₃CHO+O₂→(Ⅰ)
Ⅰ+cyclohexanone→this product +CH₃COOH+CH₃CHO

Uses of 6-Hexanolactone: The great majority of caprolactone is consumed, often in situ, as a precursor to caprolactam. It is also a monomer used in the manufacture of highly specialised polymers. Ring-opening polymerization, for example, gives polycaprolactone. In addition, this chemical is mainly used in the production of synthetic rubber, synthetic fiber and synthetic resin. Besides, it can react with 6-methyl-2-phenyl-[1,3]oxazin-4-one to get 6-methyl-2-(2-oxo-oxepan-3-yl)-2-phenyl-2,3-dihydro-[1,3]oxazin-4-one. This reaction needs reagent LDA and solvent tetrahydrofuran at temperature of -70 °C. The reaction time is 2 hours. The yield is 80%.

When you are using this chemical, please be cautious about it as the following:
It is irritating to eyes, respiratory system and skin. And it also has risk of serious damage to the eyes. In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. If you want to contact this product, you must wear suitable gloves and eye/face protection.

People can use the following data to convert to the molecule structure.
1. SMILES:C1CCC(=O)OCC1
2. InChI:InChI=1/C6H10O2/c7-6-4-2-1-3-5-8-6/h1-5H2
3. InChIKey:PAPBSGBWRJIAAV-UHFFFAOYAG

The following are the toxicity data which has been tested.