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EC number: 256-170-3 | CAS number: 44914-03-6
Hydrolysis
Administrative data
Link to relevant study record(s)
Description of key information
Hydrolysis is not expected to contribute significantly to the fate of 2-MBA.
Key value for chemical safety assessment
Additional information
Experimental data for 2-MBA hydrolysis were not available. The related compound n-butyl acrylate (n-BA) was studied using USEPA method 40 CFR Part 796.3500 under GLP criteria. n-BA has an abiotic hydrolytic half-life of 1100 days at pH 7, 25 °C. This study was considered reliable without restrictions for n-BA and is reliable with restrictions as read-across data for 2-MBA. n-BA and 2-MBA are structurally and chemically very similar, differing only in presence or absence of a methyl branch at the 2-carbon of the alcohol group, which is adjacent to the ester bond. 2-MBA is expected to be somewhat less hydrolytically active than n-BA due to steric factors resulting from its methyl branch. In addition, 2-MBA and n-BA (as well as another analog, isooctyl acrylate) are readily biodegradable. We have proposed adaptation (omission) of the data requirement for hydrolysis for 2-MBA, owing to ready biodegradability. 2-MBA would be biodegraded in non-sterile aquatic and terrestrial systems well before abiotic hydrolysis would occur.
Data matrix – Analog approach |
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Target substance |
Source substance |
|
CHEMICALNAME |
2-methylbutyl acrylate |
n-butyl acrylate |
CAS# |
44914-03-6 |
141-32-2 |
Molecular formula |
C8H14O2 |
C7H12O2 |
Molecular Weight |
142.2 |
128.2 |
PHYSICO-CHEMICAL DATA |
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Melting Point |
≤ -75 °C |
Not available |
Boiling Point |
161.7 °C at 1013hPa |
147 °C at 1013hPa |
Density |
0.8886 g/cm3 at 25 °C |
0.9 g/cm3 at 20.0 °C |
Vapour Pressure |
1.7 hPa at 20°C |
5 hPa at 22.2°C |
Partition Coefficient (log Kow) |
2.9 |
2.38 (at 25°C) |
Water Solubility |
316 mg/L at 23 °C |
Not available |
ENVIRONMENTAL FATE and PATHWAYS |
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Photodegradation |
DT50 1.04 d (AOPWIN v1.92) |
Not determined |
Stability in Water |
Adaptation, readily biodegradable |
DT50, 1100 day at pH 7, 25 °C (40CFR796.3500) |
Aerobic Biodegradation |
60% after 11 days (OECD 301D) |
80 - 90% after 28 days (OECD 310) |
Bioconcentration |
Not bioaccumulative |
Not bioaccumulative |
Transport and Distribution |
Koc 263 – 302 (Calculated by TGD method) |
Koc 40-148 (EPA OTS 796.2750) |
Henry's Law constant |
96 Pa*m3/mol at 23.1 °C |
Not determined |
ENVIRONMENTAL TOXICITY |
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Toxicity to Microorganisms (activated sludge respiration) |
3-hour EC50 >1000 mg/L (OECD 209) |
3d EC50 >150 mg/L (ASTM STP 528) |
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