The Cyclopentene, 4-methyl-, with the CAS registry number 1759-81-5, is also known as 1-Methyl-3-cyclopentene. This chemical's molecular formula is C₆H₁₀ and molecular weight is 82.14. What's more, its IUPAC name is 4-methylcyclopentene. 

Physical properties of Cyclopentene, 4-methyl- are: (1)ACD/LogP: 2.82; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): 2.82; (4)ACD/BCF (pH 5.5): 82.26; (5)ACD/KOC (pH 5.5): 817.56; (6)Index of Refraction: 1.449; (7)Molar Refractivity: 27.37 cm³; (8)Molar Volume: 102 cm³; (9)Polarizability: 10.85×10^-24cm³; (10)Surface Tension: 26.2 dyne/cm; (11)Density: 0.805 g/cm³; (12)Enthalpy of Vaporization: 29.49 kJ/mol; (13)Boiling Point: 65.7 °C at 760 mmHg; (14)Vapour Pressure: 168 mmHg at 25°C.

Preparation of Cyclopentene, 4-methyl-: this chemical can be prepared by cyclohexene at the temperature of 450 °C. This reaction time is 1 hour. This reaction will also need catalyst ultrastabilized Y zeolite. The yield is about 54.4%.

You can still convert the following datas into molecular structure:
(1)Canonical SMILES: CC1CC=CC1
(2)InChI: InChI=1S/C6H10/c1-6-4-2-3-5-6/h2-3,6H,4-5H2,1H3
(3)InChIKey: FWMRUAODTCVEQK-UHFFFAOYSA-N