ChemSpider 2D Image | Pyrylium | C5H5O


  • Molecular FormulaC5H5O
  • Average mass81.092 Da
  • Monoisotopic mass81.033493 Da
  • ChemSpider ID7827742
  • Charge - Charge

More details:

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

Pyrylium [ACD/Index Name] [ACD/IUPAC Name] [Wiki]
Pyrylium [German] [ACD/Index Name] [ACD/IUPAC Name]
Pyrylium [French] [ACD/Index Name] [ACD/IUPAC Name]
pyrylium cation
pyrylium ion

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

CHEBI:36120 [DBID]

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

Boiling Point:
Vapour Pressure:
Enthalpy of Vaporization:
Flash Point:
Index of Refraction:
Molar Refractivity:
#H bond acceptors: 1
#H bond donors: 0
#Freely Rotating Bonds: 0
#Rule of 5 Violations:
ACD/LogD (pH 5.5):
ACD/BCF (pH 5.5):
ACD/KOC (pH 5.5):
ACD/LogD (pH 7.4):
ACD/BCF (pH 7.4):
ACD/KOC (pH 7.4):
Polar Surface Area: 13 Å2
Surface Tension:
Molar Volume:

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

 Log Octanol-Water Partition Coef (SRC):
    Log Kow (KOWWIN v1.67 estimate) =  1.32

 Boiling Pt, Melting Pt, Vapor Pressure Estimations (MPBPWIN v1.42):
    Boiling Pt (deg C):  70.82  (Adapted Stein & Brown method)
    Melting Pt (deg C):  -91.16  (Mean or Weighted MP)
    VP(mm Hg,25 deg C):  138  (Mean VP of Antoine & Grain methods)

 Water Solubility Estimate from Log Kow (WSKOW v1.41):
    Water Solubility at 25 deg C (mg/L):  9622
       log Kow used: 1.32 (estimated)
       no-melting pt equation used

 Water Sol Estimate from Fragments:
    Wat Sol (v1.01 est) =  1483.5 mg/L

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

 Henrys Law Constant (25 deg C) [HENRYWIN v3.10]:
   Bond Method :   Incomplete
   Group Method:   Incomplete
 Henrys LC [VP/WSol estimate using EPI values]:  1.530E-003 atm-m3/mole

 Log Octanol-Air Partition Coefficient (25 deg C) [KOAWIN v1.10]:
  Can Not Estimate (can not calculate HenryLC)

 Probability of Rapid Biodegradation (BIOWIN v4.10):
   Biowin1 (Linear Model)         :   0.7089
   Biowin2 (Non-Linear Model)     :   0.8650
 Expert Survey Biodegradation Results:
   Biowin3 (Ultimate Survey Model):   3.0200  (weeks       )
   Biowin4 (Primary Survey Model) :   3.7307  (days-weeks  )
 MITI Biodegradation Probability:
   Biowin5 (MITI Linear Model)    :   0.5081
   Biowin6 (MITI Non-Linear Model):   0.5422
 Anaerobic Biodegradation Probability:
   Biowin7 (Anaerobic Linear Model):  0.5814
 Ready Biodegradability Prediction:   YES

Hydrocarbon Biodegradation (BioHCwin v1.01):
    Structure incompatible with current estimation method!

 Sorption to aerosols (25 Dec C)[AEROWIN v1.00]:
  Vapor pressure (liquid/subcooled):  1.8E+004 Pa (135 mm Hg)
  Log Koa (): not available
   Kp (particle/gas partition coef. (m3/ug)):
       Mackay model           :  1.67E-010 
       Octanol/air (Koa) model:  not available
   Fraction sorbed to airborne particulates (phi):
       Junge-Pankow model     :  6.02E-009 
       Mackay model           :  1.33E-008 
       Octanol/air (Koa) model:  not available

 Atmospheric Oxidation (25 deg C) [AopWin v1.92]:
   Hydroxyl Radicals Reaction:
      OVERALL OH Rate Constant = 143.9400 E-12 cm3/molecule-sec
      Half-Life =     0.074 Days (12-hr day; 1.5E6 OH/cm3)
      Half-Life =     0.892 Hrs
   Ozone Reaction:
      OVERALL Ozone Rate Constant =    63.180000 E-17 cm3/molecule-sec
      Half-Life =     0.018 Days (at 7E11 mol/cm3)
      Half-Life =     26.120 Min
   Fraction sorbed to airborne particulates (phi): 9.68E-009 (Junge,Mackay)
    Note: the sorbed fraction may be resistant to atmospheric oxidation

 Soil Adsorption Coefficient (PCKOCWIN v1.66):
      Koc    :  165.5
      Log Koc:  2.219 

 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 = 0.320 (BCF = 2.09)
       log Kow used: 1.32 (estimated)

 Volatilization from Water:
    Henry LC:  0.00153 atm-m3/mole  (calculated from VP/WS)
    Half-Life from Model River:      1.263  hours
    Half-Life from Model Lake :      89.29  hours   (3.72 days)

 Removal In Wastewater Treatment:
    Total removal:              39.50  percent
    Total biodegradation:        0.06  percent
    Total sludge adsorption:     1.24  percent
    Total to Air:               38.19  percent
      (using 10000 hr Bio P,A,S)

 Level III Fugacity Model:
           Mass Amount    Half-Life    Emissions
            (percent)        (hr)       (kg/hr)
   Air       0.42            0.35         1000       
   Water     73              360          1000       
   Soil      26.4            720          1000       
   Sediment  0.16            3.24e+003    0          
     Persistence Time: 93 hr


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