Gas-Phase Ozone Oxidation of Monoterpenes: Gaseous and ...

232 JIANZHEN YU ET AL.
Table VII. Products from ozone oxidation of 3 -carene
Product Structure Pseudo-molecular ions in CI
mass spectrum
C 1 :C 8 H 12 O 4 M+1: 317 M-15: 301
nor-3-caric acid M-89: 227 M-117: 199
MW = 172
deri. MW = 316
C 2 :C 9 H 14 O 4 M+147: 477 M+73: 403
3-caric acid M+29: 359 M+1: 331
MW = 186 M-15: 315 M-89: 241
deri. MW = 330 M-117: 213
C 3 :C 9 H 14 O 4 M+73: 403 M+1: 331
pinic acid M-15: 315 M-89: 241
MW = 186 M-117: 213
deri. MW = 330
C 4 : One carbonyl and two M+181: 638 M+1: 458
MW = 118 OH/COOH M-15: 442 M-89: 368
deri. MW = 457 groups M-117: 340 M-197: 260
C 5 : One carbonyl group, M+181: 518 M+1: 338
MW = 142 no OH/COOH M-17: 320 M-197: 140
deri. MW = 337 groups
C 6 :C 8 H 12 O 2 M+1: 424 M-89: 334
MW = 140 M-197: 226
deri. MW = 423
C 7 :C 9 H 14 O 3 M+73: 510 M+1: 437
3-norcaronic acid and M-89: 348 M-181: 256
isomers M-197: 240
MW = 170
deri. MW = 437
C 8 :C 10 H 16 O 3 M+73: 524 M+1: 452
3-caronic acid M-89: 362 M-181: 270
MW = 184 M-197: 254 M-197: 254
deri. MW = 451 M-211: 240
C 9 :C 10 H 16 O 3 e.g. M+1: 540 M-89: 450
hydroxy 3-caronic acid M-197: 342
MW = 184
deri. MW = 539
C 10 : Two carbonyl groups, M+1: 519 M-181: 337
MW = 128 no OH/COOH groups M-197: 321 M-224: 294
deri. MW = 518