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SupportingInformation
SupportingInformation
AmassspectrometrybasedmethodfordifferentiationofpositionalisomersofmonosubstitutedpyrazineN-oxidesusingmetalioncomplexes
MatiasButlerandGabrielaM.Cabrera
DepartamentodeQuímicaOrgánica,UMyMFOR-CONICET,FacultaddeCienciasExactasyNaturales,UniversidaddeBuenosAires,CiudadUniversitaria,PabellónII,3ºpiso,C1428EHA,BuenosAires,Argentina.
FigureS1.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-chloropyrazine1aand3-chloropyrazine1bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS2.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-aminopyrazine2aand3-aminopyrazine2bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS3.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-methylpyrazine3aand3-methylpyrazine3bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS4.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-acetylpyrazine4aand3-acetylpyrazine4bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS5.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-carboxypyrazine5aand3-carboxypyrazine5bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS6.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-methoxypyrazine7aand3-methoxypyrazine7bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS7.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-acetamidopyrazine8aand3-acetamidopyrazine8bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS8.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-(1-hydroxyethyl)pyrazine9aand3-(1-hydroxyethyl)pyrazine9bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS9.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-(methoxycarbonyl)pyrazine10aand3-(methoxycarbonyl)pyrazine10bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS10.ESImassspectrarecordedforproducedmetalionadductsoftheregio-isomericN-oxidesof2-carbamoylpyrazine11aand3-carbamoylpyrazine11bwiththemetalions,top:
calcium(II),middle:
copper(II)andbottom:
aluminum(III).
FigureS11.PCAanalysisofthedataobtainedforproducedmetalionadductsoftheregio-isomericpyrazineN-oxides(1a-11a;1b-11b)withcopper(II).a)scoresplot;b)loadingsplot(Seethetextforthenumericalcodeinterpretation).
FigureS12.PCAanalysisofthedataobtainedforproducedmetalionadductsoftheregio-isomericpyrazineN-oxides(1a-11a;1b-11b)withaluminum(III).a)scoresplot;b)loadingsplot(Seethetextforthenumericalcodeinterpretation).
TableS1.SummaryofthemostsignificantaionsobservedintheESImassspectracompounds1a-11a;1b-11bwithcalcium(II);observedm/z(errorinppm).Valuesinboldindicatethemostabundantionforeachcompound.*Peakoverlapobserved.aIonswithrelativeintensitieshigherthan5%.Thelargestpeakoftheisotopedistributionisgiven.
Code
Ion/Compound
1a
1b
2a
2b
3a
3b
4a
4b
5ª
5b
6a
6b
7a
7b
8a
8b
9a
9b
10a
10b
11ª
11b
211
[M+Ca]++
84.9771
(3.7)
84.9777
(3.0)
89.0024
(2.4)
89.0027
(5.2)
83.0019
(3.3)
96.5077(10.2)
90.0104
(4.1)
96.9998
(0.8)
96.9992
(4.9)
89.4996
(2.2)
89.4993
(6.0)
2111
[M+Ca+H2O]++
93.9833
(6.4)
93.9825
(2.3)
98.0077
(2.1)
98.0077
(1.7)
92.0069
(6.0)
105.5139(9.0)
99.0151
(2.7)
106.0053(3.3)
106.0047
(2.6)
98.5049
(2.7)
98.5044
(7.1)
2112
[M+Ca+2H2O]++
102.9900
*
102.9875
(5.0)
107.0126
(2.1)
107.0131
(3.0)
101.0124(3.7)
114.5180(1.7)
114.5188(4.7)
108.0206(0.1)
115.0108(5.2)
115.0103
(0.7)
107.5105(0.7)
107.5105(0.8)
2113
[M+Ca+3H2O]++
111.9939
(5.4)
111.9928
(4.3)
116.0178
(1.9)
116.0184
(2.7)
110.0195(13.0)
123.5233(1.4)
123.524
(4.1)
117.0259(0.3)
124.0159(2.9)
124.0157
(1.3)
116.5159(2.1)
116.5153(3.4)
2114
[M+Ca+4H2O]++
120.9979
(5.3)
132.5286(1.5)
133.0210
(1.2)
125.5204(4.4)
11
[M+H]+
131.0012
(4.0)
130.9996
(8.3)
112.0510
(3.8)
112.0523
(16.1)
111.0554
(0.9)
111.0561
(7.3)
139.0499
(2.5)
139.0508
(4.5)
141.0294
(0.4)
141.0301
(4.4)
113.0349(3.4)
113.0353(6.3)
127.0495(5.9)
127.0497
(4.3)
154.0593(11.4)
154.0611(0.2)
141.0660(1.2)
141.0663(3.4)
155.0444(4.9)
155.0445(3.8)
140.0450
(3.0)
140.0449(4.0)
110
[M+Na]+
152.9826
(0.2)
134.0332
(5.4)
161.0317
(3.0)
161.0313
(5.1)
163.012
(3.6)
135.0160
(3.4)
135.0160
(3.7)
149.0312(6.7)
176.0406(14.1)
176.0422(4.7)
163.0468(5.8)
163.0481(1.7)
177.0272(0.8)
177.0269(0.6)
162.0277(0.2)
111
[M+Ca-H]+
149.9983
(5.4)
150.0000
*
176.9997
(14.5)
176.9995(13.3)
178.9777
(7.0)
178.9787(13.0)
150.9821(4.3)
150.9832(11.5)
192.0087(3.6)
179.0139(6.0)
179.0152(13.2)
177.9904(11.2)
1111
[M+Ca+H2O-H]+
168.0081
(0.1)
168.0090
(5.8)
167.0117
(6.8)
195.0086
(4.4)
195.008
(1.5)
196.9886
(8.3)
196.9884
(7.4)
168.9923(1.3)
168.9923(1.5)
210.0196(4.9)
210.0201(7.0)
197,0234(0.5)
197.0236(1.4)
211.0042(7.4)
196.0039(4.6)
196.0036(3.1)
1112
[M+Ca+2H2O-H]+
186.0174
(6.5)
213.0184
(0.6)
213.0154
*
214.9984
(4.1)
214.9984
(4.0)
187.0024(1.2)
186.9980
*
228.0268(10.4)
228.0260(13.9)
215.0281
*
215.0361(10.1)
229.0147(6.6)
229.0092
*
214.0107(13.2)
214.0120(7.1)
11101
[M+Ca+35Cl]+
204.9252
(4.6)
204.9253
(4.8)
185.9790
*
184.9794(2.7)
184.9816
*
212.9721
(8.1)
212.9691
*
186.9590(4.4)
186.9550
*
200.9747(4.4)
200.9746(3.9)
227.9877
(13.1)
214.9909(6.6)
214.9896(0.6)
228.9667(8.9)
228.9708(9.1)
213.9642
*
213.9656
*
11111
[M+Ca+35Cl+H2O]+
222.9351
(1.0)
222.9349
(0.2)
203.9864
(8.2)
202.9887(3.6)
202.9911
(8.2)
230.9854
(4.5)
230.9856
(5.3)
204.9650
*
204.9682(2.6)
218.9852(3.9)
245.9928(10.1)
233.0019(8.0)
232.9973(11.8)
246.9816(9.2)
246.9805(4.7)
231.9808(4.8)
231.9812(6.7)
11121
[M+Ca+35Cl+2H2O]+
240.9448
(2.6)
240.9448
(2.7)
221.9965
(5.6)
220.9987(6.1)
221.0012
(5.1)
248.9945
(1.7)
222.9800(3.0)
236.9954(1.7)
264.0073(5.5)
264.9914(5.8)
249.9894(3.1)
221
[2M+Ca]++
149.9747
(3.8)
149.975
(5.5)
131.0237
(2.5)
130.0284(2.4)
130.0288
(0.6)
158.0239
(1.3)
158.0235
(1.0)
146.0231(4.1)
146.0232
(3.5)
160.0399(0.0)
174.0192(3.7)
174.0193(4.0)
159.0190(0.2)
2211
[2M+Ca+H2O]++
158.9805
(6.6)
158.9793
(0.7)
140.0292
(0.8)
139.0338(1.7)
139.0346
(3.7)
167.0296
(3.7)
167.0298
(5.2)
141.0125(5.7)
141.0133(0.1)
155.0286(2.5)
155.0289
(0.4)
182.0391(4.3)
169.0444(0.9)
169.0444(1.1)
183.0251(6.9)
183.0245(3.3)
168.0250(4.6)
168.0219(13.9)
2212
[2M+Ca+2H2O]++
167.9860
(7.5)
167.9845
(1.2)
149.0353
(4.7)
148.0393
(0.1)
148.0406
(8.6)
176.0348
(3.2)
176.0348
(3.1)
150.0178(5.6)
164.0340
(1.3)
164.0348
(3.5)
191.0456(2.5)
178.0494(2.8)
178.0497(1.3)
192.0297(3.0)
192.0299(3.7)
177.0283(6.6)
177.0300(2.8)
2213
[2M+Ca+3H2O]++
176.9903
(1.9)
176.9895
(2.8)
158.0400
(0.8)
157.0432(8.7)
157.0451
(2.9)
159.0224(9.1)
173.0393
(1.4)
200.0515(5.5)
187.0557(3.1)
121
[2M+Ca-H]+
261.0412
(1.6)
315.0412
(3.5)
263.0098(3.8)
263.0097(3.4)
345.0611(2.3)
319.0716(0.8)
319.0706(2.3)
317.0314(2.5)
1211
[2M+Ca+H2O-H]+
279.0519
(2.3)
337.0111
(5.9)
337.0094
(0.8)
281.0201(2.8)
281.0189
(1.6)
363.0705(5.3)
337.0816(1.1)
337.0809(3.1)
365.0405(0.2)
1212
[2M+Ca+2H2O-H]+
355.0197
(4.3)
12101
[2M+Ca+35Cl]+
334.9153
(7.0)
334.9130
(14.0)
297.0197
(7.6)
295.0252(5.9)
295.0284
(5.0)
351.0168
(0.1)
351.0172
(1.4)
298.9858
(1.2)
327.0183(4.8)
327.0184
(4.9)
355.0489(2.5)
355.0486(1.6)
383.0076(2.7)
383,0064(0,4)
353.0071(0.5)
12111
[2M+Ca+35Cl+H2O]+
352.9279
(1.0)
352.9302
(14.8)
315.0286
(2.0)
313.0355(6.3)
313.0379
(1.5)
316.9952
(2.6)
345.0271(0.7)
345.0278
(1.4)
373.0575(2.9)
401.0170(0.4)
231
[3M+Ca]++
214.9684
(11.4)
186.5466
(5.1)
185.049
*
227.0457
(2.5)
227.0462
(4.8)
209.0460
(4.0)
209.0465
(6.7)
230.0686(0.0)
230.0688(0.7)
251.0378(1.2)
251.0376(0.5)
228.5391(4.7)
2311
[3M+Ca+H2O]++
223.9759
(0.9)
195.5519
(4.8)
194.0589
(4.4)
236.0508
(1.8)
218.0498(2.9)
239.0747(3.4)
13101
[3M+Ca+35Cl]+
408.0598
(2.2)
495.1061(1.0)
241
[4M+Ca]++
300.0987(2.6)
TableS2.SummaryofthemostsignificantaionsobservedintheESImassspectra