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Table 4

Molecular structure and confirmation methods of α-terpineol photodegradation transformation products

Product nameMolecular structureCharacteristic ions (m/z)Identification method
p-Methane-1,8-diol (P1)  73, 81, 131, 211 Silylation 
4-Methyl-3-cyclohexen-1-one (P2)  79, 107, 181, 288, 305 Oximation 
1,3-Dihydroxyacetone (P3)  117, 161, 181, 195 Oximation 
4-Methyl-2-oxopentanoic acid (P4)  73, 181, 200, 355, 382 Combined oximation and silylation 
3-Methyl-2-oxobutanoic acid (P5)  73, 181, 366, 383 Combined oximation and silylation 
2,3-Butanedione (P6)  181, 279, 476 Oximation 
Isobutyraldehyde (P7)  56, 117, 181, 195, 250 Oximation 
Butyraldehyde (P8)  161, 181, 195, 239 Oximation 
Propionaldehyde (P9)  161, 181, 195, 236 Oximation 
Acetone (P10)  72, 117, 181, 253 Oximation 
Product nameMolecular structureCharacteristic ions (m/z)Identification method
p-Methane-1,8-diol (P1)  73, 81, 131, 211 Silylation 
4-Methyl-3-cyclohexen-1-one (P2)  79, 107, 181, 288, 305 Oximation 
1,3-Dihydroxyacetone (P3)  117, 161, 181, 195 Oximation 
4-Methyl-2-oxopentanoic acid (P4)  73, 181, 200, 355, 382 Combined oximation and silylation 
3-Methyl-2-oxobutanoic acid (P5)  73, 181, 366, 383 Combined oximation and silylation 
2,3-Butanedione (P6)  181, 279, 476 Oximation 
Isobutyraldehyde (P7)  56, 117, 181, 195, 250 Oximation 
Butyraldehyde (P8)  161, 181, 195, 239 Oximation 
Propionaldehyde (P9)  161, 181, 195, 236 Oximation 
Acetone (P10)  72, 117, 181, 253 Oximation 
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