Registration Dossier

Environmental fate & pathways

Additional information on environmental fate and behaviour

Administrative data

Endpoint:
additional information on environmental fate and behaviour
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: study well documented, meets generally accepted scientific principles

Data source

Reference
Reference Type:
publication
Title:
The photochemical decomposition of dicumyl peroxide and cumene hydroperoxide in solution.
Author:
Norrish RGW & Searby MH
Year:
1956
Bibliographic source:
Proc Roy Soc London Ser A 237, 464-475

Materials and methods

Principles of method if other than guideline:
The photochemical decomposition of cumene hydroperoxide in the absence of oxygen was investigated in n-hexane and carbon tetrachloride solution. The degradation products were identified and the quantum yield determined.
GLP compliance:
no

Test material

Reference
Name:
Unnamed
Type:
Constituent
Type:
Constituent

Results and discussion

Applicant's summary and conclusion

Conclusions:
The photochemical decomposition of cumene hydroperoxide in the absence of oxygen was investigated in n-hexane and carbon tetrachloride solution. The degradation products were identified and the quantum yield determined. As degradation products were identified in n-hexane solution and
a. irradiation at 313 nm: mainly alpha, alpha'-dimethyl benzyl alcohol and to a lesser extent acetone, phenol, and water
b. irradiation at 253.7 nm: mainly alpha, alpha'-dimethyl benzyl alcohol and to a lesser extent acetone, acetophenone, phenol, and water.
The mean quantum yield was determined to be 1.57
As degradation products were identified in carbon tetrachloride solution and
a. irradiation at 313 nm: mainly acetone and partly traces of alpha, alpha'-dimethyl benzyl alcohol, alpha-methyl styrene, acetophenonene (phenol was only detected once in the three replicates in appreciable amounts)
b. irradiation at 253.7 nm: mainly acetone, and alpha-methyl styrene and phenol.
The mean quantum yield for this reaction was determined to be 0.75.
Executive summary:

The photochemical decomposition of cumene hydroperoxide in the absence of oxygen was investigated in n-hexane and carbon tetrachloride solution. The degradation products were identified and the quantum yield determined. As degradation products were identified in n-hexane solution and

a. irradiation at 313 nm: mainly alpha, alpha'-dimethyl benzyl alcohol and to a lesser extent acetone, phenol, and water

b. irradiation at 253.7 nm: mainly alpha, alpha'-dimethyl benzyl alcohol and to a lesser extent acetone, acetophenone, phenol, and water.

The mean quantum yield was determined to be 1.57

As degradation products were identified in carbon tetrachloride solution and

a. irradiation at 313 nm: mainly acetone and partly traces of alpha, alpha'-dimethyl benzyl alcohol, alpha-methyl styrene, acetophenonene (phenol was only detected once in the three replicates in appreciable amounts)

b. irradiation at 253.7 nm: mainly acetone, and alpha-methyl styrene and phenol.

The mean quantum yield for this reaction was determined to be 0.75.