α,α-dimethylbenzyl hydroperoxide

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

Test material information

Constituent 1

Reference substance name:

α,α-dimethylbenzyl hydroperoxide

EC Number:

201-254-7

EC Name:

α,α-dimethylbenzyl hydroperoxide

Cas Number:

80-15-9

Molecular formula:

C9H12O2

IUPAC Name:

1-methyl-1-phenylethyl hydroperoxide

Constituent 2

Reference substance name:

cumene hydroperoxide

IUPAC Name:

cumene hydroperoxide

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.