ChemSpider 2D Image | 1,2-Dihydropentalene | C8H8


  • Molecular FormulaC8H8
  • Average mass104.149 Da
  • Monoisotopic mass104.062599 Da
  • ChemSpider ID124885

More details:

Validated by Experts, Validated by Users, Non-Validated, Removed by Users

1,2-Dihydropentalen [German] [ACD/IUPAC Name]
1,2-Dihydropentalene [ACD/IUPAC Name]
1,2-Dihydropentalène [French] [ACD/IUPAC Name]
Pentalene, 1,2-dihydro- [ACD/Index Name]
30294-54-3 [RN]

Predicted data is generated using the ACD/Labs Percepta Platform - PhysChem Module

Density: 1.0±0.1 g/cm3
Boiling Point: 247.2±7.0 °C at 760 mmHg
Vapour Pressure: 0.0±0.2 mmHg at 25°C
Enthalpy of Vaporization: 46.5±0.8 kJ/mol
Flash Point: 68.3±13.0 °C
Index of Refraction: 1.581
Molar Refractivity: 34.3±0.4 cm3
#H bond acceptors: 0
#H bond donors: 0
#Freely Rotating Bonds: 0
#Rule of 5 Violations: 0
ACD/LogP: 2.47
ACD/LogD (pH 5.5): 2.77
ACD/BCF (pH 5.5): 74.80
ACD/KOC (pH 5.5): 763.72
ACD/LogD (pH 7.4): 2.77
ACD/BCF (pH 7.4): 74.80
ACD/KOC (pH 7.4): 763.72
Polar Surface Area: 0 Å2
Polarizability: 13.6±0.5 10-24cm3
Surface Tension: 33.2±5.0 dyne/cm
Molar Volume: 102.8±5.0 cm3

Predicted data is generated using the US Environmental Protection Agency’s EPISuite™

 Log Octanol-Water Partition Coef (SRC):
    Log Kow (KOWWIN v1.67 estimate) =  2.83

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
    Boiling Pt (deg C):  149.92  (Adapted Stein & Brown method)
    Melting Pt (deg C):  -27.36  (Mean or Weighted MP)
    VP(mm Hg,25 deg C):  5.15  (Mean VP of Antoine & Grain methods)

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
    Water Solubility at 25 deg C (mg/L):  126.7
       log Kow used: 2.83 (estimated)
       no-melting pt equation used

 Water Sol Estimate from Fragments:
    Wat Sol (v1.01 est) =  261.58 mg/L

 ECOSAR Class Program (ECOSAR v0.99h):
    Class(es) found:
       Neutral Organics

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
   Bond Method :   5.33E-002  atm-m3/mole
   Group Method:   Incomplete
 Henrys LC [VP/WSol estimate using EPI values]:  5.570E-003 atm-m3/mole

 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
  Log Kow used:  2.83  (KowWin est)
  Log Kaw used:  0.338  (HenryWin est)
      Log Koa (KOAWIN v1.10 estimate):  2.492
      Log Koa (experimental database):  None

 Probability of Rapid Biodegradation (BIOWIN v4.10):
   Biowin1 (Linear Model)         :   0.6980
   Biowin2 (Non-Linear Model)     :   0.8220
 Expert Survey Biodegradation Results:
   Biowin3 (Ultimate Survey Model):   2.9690  (weeks       )
   Biowin4 (Primary Survey Model) :   3.6975  (days-weeks  )
 MITI Biodegradation Probability:
   Biowin5 (MITI Linear Model)    :   0.4665
   Biowin6 (MITI Non-Linear Model):   0.5265
 Anaerobic Biodegradation Probability:
   Biowin7 (Anaerobic Linear Model):  0.3020
 Ready Biodegradability Prediction:   NO

 Hydrocarbon Biodegradation (BioHCwin v1.01):
     LOG BioHC Half-Life (days) :   1.2224
     BioHC Half-Life (days)     :  16.6891

 Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
  Vapor pressure (liquid/subcooled):  631 Pa (4.73 mm Hg)
  Log Koa (Koawin est  ): 2.492
   Kp (particle/gas partition coef. (m3/ug)):
       Mackay model           :  4.76E-009 
       Octanol/air (Koa) model:  7.62E-011 
   Fraction sorbed to airborne particulates (phi):
       Junge-Pankow model     :  1.72E-007 
       Mackay model           :  3.81E-007 
       Octanol/air (Koa) model:  6.1E-009 

 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
   Hydroxyl Radicals Reaction:
      OVERALL OH Rate Constant = 180.9395 E-12 cm3/molecule-sec
      Half-Life =     0.059 Days (12-hr day; 1.5E6 OH/cm3)
      Half-Life =     0.709 Hrs
   Ozone Reaction:
      OVERALL Ozone Rate Constant =     6.402500 E-17 cm3/molecule-sec
      Half-Life =     0.179 Days (at 7E11 mol/cm3)
      Half-Life =      4.296 Hrs
   Fraction sorbed to airborne particulates (phi): 2.76E-007 (Junge,Mackay)
    Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
      Koc    :  540.1
      Log Koc:  2.732 

 Aqueous Base/Acid-Catalyzed Hydrolysis (25 deg C) [HYDROWIN v1.67]:
    Rate constants can NOT be estimated for this structure!

 Bioaccumulation Estimates from Log Kow (BCFWIN v2.17):
   Log BCF from regression-based method = 1.478 (BCF = 30.06)
       log Kow used: 2.83 (estimated)

 Volatilization from Water:
    Henry LC:  0.0533 atm-m3/mole  (estimated by Bond SAR Method)
    Half-Life from Model River:      1.053  hours
    Half-Life from Model Lake :      97.06  hours   (4.044 days)

 Removal In Wastewater Treatment (recommended maximum 95%):
    Total removal:              95.43  percent
    Total biodegradation:        0.03  percent
    Total sludge adsorption:     1.92  percent
    Total to Air:               93.48  percent
      (using 10000 hr Bio P,A,S)

 Level III Fugacity Model:
           Mass Amount    Half-Life    Emissions
            (percent)        (hr)       (kg/hr)
   Air       1.64            1.07         1000       
   Water     82.6            360          1000       
   Soil      14.7            720          1000       
   Sediment  1.01            3.24e+003    0          
     Persistence Time: 74.6 hr


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