6,6-dimethylbicyclo[3.1.1]hept-2-ene-2-propionaldehyde

Endpoint summary

Description of key information

Acute oral toxicity: LD50 between 200 and 2000 mg/kg bw with a derived geometric mean value of 632 mg/kg bw in an OECD TG 423.

Acute inhalation toxicity: LC50 is 1651 mg/m3 which is derived from the acute oral LD50 using route to route extrapolation.

Acute dermal toxicity: LD50 is 632 mg/kg bw which is derived from the acute oral LD50 using route to route extrapolation.

Key value for chemical safety assessment

Acute toxicity: via oral route

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

Dose descriptor:

LD50

Value:

632 mg/kg bw

Quality of whole database:

The acute oral toxicity result is of sufficient quality and adequate for this dossier.

Acute toxicity: via inhalation route

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

Dose descriptor:

LC50

Value:

1 651 mg/m³

Quality of whole database:

The acute inhalation toxicity has been calculation based on the acute oral toxicity using route to route extrapolation. The calculated LD50 shows that this information can be used for classification and labeling purposes.

Acute toxicity: via dermal route

Endpoint conclusion

Endpoint conclusion:

adverse effect observed

Dose descriptor:

LD50

Value:

632 mg/kg bw

Quality of whole database:

The acute dermal toxicity has been calculation based on the acute oral toxicity using route to route extrapolation. The calculated LD50 shows that this information can be used for classification and labeling purposes.

Additional information

Acute oral toxicity

The acute oral toxicity in female and male rats has been studied in accordance with OECD TG 423 and GLP principles.In this study, 9 Wistar rats (3 males and 6 females in total) were administered the substance at dose levels of 200 and 2000 mg/kg bw by oral gavage. Mortality was observed in 2 out of 3 female animals at the highest dose. One male out of six died when dosed with 200 mg/kw bw. Clinical signs observed were lethargy, flat and hunched posture, tremors, rales, uncoordinated movements, slow breathing and piloerection detected. These effects were more prominent in the highest dose group. No body weight or macroscopical abnormalities were detected. The acute oral LD50 for the substance in male and female rats was determined to be between 200 and 2000 mg/kg bw and to derive a point value the geometric mean was selected and resulted in an LD50 of 632 mg/kg bw.

Acute inhalation toxicity

For the determination of the inhalation LC50, route to route extrapolation could be performed. The extrapolated inhalation LC50 is of 1651 mg/m3 (using ECHA's CLP guidance, section, 3.1.3.3.5, 2017, using the formula: 1 mg/kg bw = 0.0052 mg/L/4h and twice the absorption of the oral route which is general considered to be 50%. This calculated LC50 of 1651 mg/m3 value exceeds the saturated vapour concentration of 322 mg/m3 (using MW and Vapour pressure). This means that the LC50 for vapours cannot be reached and therefore there is no hazard for vapour exposure. For dust/mist an LC50 > 1000 and < 5000 mg/m3 (Cat 4) may present an inhalation hazard. Using the route to route extrapolation from oral to inhalation and the calculated LC50 of 1651 mg/m3, this hazard cannot be excluded.

Acute dermal toxicity

Route to route extrapolation from the oral route is used. It is anticipated that based on the MW exceeding 100 (178) and log Kow exceeding 4, the dermal absorption is lower compared to the oral route. There is currently insufficient information from structural analogues and/or substances with similar functional groups to estimate the oral/dermal ratio or to justify the dermal LD50 > 2000 mg/kg bw (e.g. for Valproic acid no LD50 was found). Therefore, the acute oral toxicity will be directly converted to acute dermal toxicity and results in a dermal LD50 of 632 mg/kg bw (Acute Tox 3: H311).

Justification for classification or non-classification

The substance has to be classified as Acute oral Tox. 4 and shall be labelled with H302: Harmful if swallowed according to EU CLP (EC No. 1272/2008 and its amendments).

The substance has to be classified as Acute inhalation Tox. 4 and shall be labelled with H332: Harmful if inhaled according to EU CLP (EC No. 1272/2008 and its amendments).

The substance has to be classified as Acute dermal Tox. 3 and shall be labelled with H311: Toxic in contact with skin according to EU CLP (EC No. 1272/2008 and its amendments).