Registration Dossier
Registration Dossier
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EC number: 255-670-9 | CAS number: 42125-46-2
Endpoint summary
Administrative data
Description of key information
Additional information
Stability
Parent compound: Dissolved 4-tert-butylcyclohexyl chloroformate is expected to hydrolyse in less than 12 hours.
Hydrolysis product: 4 -tert- butylcyclohexanol is considered as hydrolytically stable.
In air, 4 -tert-butylcyclohexyl chloroformate is expected to be photodegraded by OH-radicals with a half-life of 26.6 h (BASF AG, 2008).
Hydrolysis product: 4 -tert-butylcyclohexanol: A half-life of 19 h was calculated for the degradation in the atmosphere by OH-radicals (BASF SE, 2009).
Biodegradation
Parent compound: moderately/partly biodegradable (BASF, 2001). The hydrolysis product 4 -tert-butycyclohexanol is readily biodegradable according to OECD criteria (US EPA HPV Dossier, 2006).
Regarding the hydrolysis products HCl and CO2, biodegradation is not applicable due to the inorganic character of these molecules. Regarding biodegradation in soil or sediment there are no data available.
Bioaccumulation
Due to the high log Kow of the parent compound and its hydrolyisis product, accumulation in organisms is possible (calculated BCF = 333; BASF SE, 2008). Based on a measured log Pow of 3.23, the BCF of the hydrolysis product 4 -tert-butylcyclohexanol is 63 (BASF SE, 2009).
Transport and distribution
The estimated Koc values for the parent compound 4 -tert-butylcyclohexyl chloroformate (Koc = 665) and the hydrolysis product 4-tert-butylcyclohexanol(Koc = 167) indicate that adsorption to soils or sediments is possible (BASF SE, 2008; 2009).
A high Henry's Law Constant (HLC) of 1350 Pa m³/mol was estimated for 4 -tert-butylcyclohexyl chloroformate, indicating rapid volatilization from surface waters (BASF SE; 2008). However, it is hydrolysed to 4-tert-butylcyclohexanol, CO2and HCl. The HLC for 4-tert-butylcyclohexanol was estimated to be between 1.54 Pa m³/mol, indicating slow volatilization from surface waters (BASF SE, 2009).
Following Mackay Level I calculations, the parent compound will preferentially distribute into the compartment air (99.8 %) (BASF SE, 2008). Following Mackay Level III calculations, the hydrolysis product 4 -tert-butycyclohexanol is expected to preferentially distribute into the compartments soil (59.5%) and water (38.1%) (US EPA HPV Dossier, 2006).
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