139:
20:
149:
atoms and not to any hydrogen atoms, and the carbon attached to the nitrogen atom, which is attached to two hydrogen atoms (far right). There is a five-carbon-atom poly-methine chain in the center of this molecule.
109:
The name "methine" is also widely used in non-systematic nomenclature for the methanetriyl group (IUPAC): a carbon atom with four single bonds, where one bond is to a hydrogen atom (
75:
328:
1247:
1252:
121:
Two or more methine bridges can overlap, forming a chain or ring of carbon atoms connected by alternating single and double bonds, as in
321:
295:
259:
1151:
1275:
724:
314:
145:
Every carbon atom in this molecule is a methine carbon atom, except for three; two that are attached to the two
761:
1234:
1134:
238:
1280:
1241:
1129:
232:
1210:
655:
168:
516:
97:
89:
This group is sometimes called "methylidyne", however that name belongs properly to either the
1200:
1170:
928:
550:
154:
90:
28:
905:
399:
337:
214:
40:
1124:
883:
878:
861:
844:
645:
394:
197:
300:
in the
Chemical Entities of Biological Interest (ChEBI) database. Accessed on 2015-03-05.
1195:
1190:
1066:
1061:
1056:
849:
816:
600:
582:
572:
1269:
1215:
1163:
1094:
980:
970:
965:
955:
950:
900:
895:
811:
806:
796:
650:
605:
567:
555:
526:
55:
1146:
1033:
1028:
1005:
756:
595:
521:
458:
453:
431:
387:
372:
362:
180:
1205:
1158:
1119:
1000:
888:
873:
868:
856:
421:
416:
382:
377:
367:
345:
59:
1114:
1105:
985:
940:
836:
801:
791:
731:
667:
590:
538:
122:
1081:
995:
960:
945:
933:
776:
751:
560:
138:
1089:
1043:
1010:
706:
612:
486:
441:
426:
146:
63:
1051:
975:
826:
821:
786:
771:
766:
736:
719:
543:
470:
436:
158:
47:
1139:
1071:
915:
624:
617:
511:
492:
481:
465:
411:
51:
306:
96:(connected to the rest of the molecule by a triple bond) or to the
19:
1020:
990:
923:
781:
746:
741:
714:
662:
629:
533:
357:
269:
18:
448:
310:
137:
153:
Chains of alternating single and double bonds often form
106:(the two atoms as a free molecule with dangling bonds).
1183:
1103:
1080:
1042:
1019:
914:
835:
705:
682:
638:
581:
504:
479:
344:
322:
8:
702:
501:
329:
315:
307:
268:Chemical Entities of Biological Interest (
163:
131:
127:
62:, where one of the single bonds is to a
251:
7:
14:
23:Methine or methylylidene (IUPAC)
1:
171:character to the compound.
66:. The group is also called
1297:
1224:
54:atom bound by two single
46:, derived formally from
1235:chemical classification
260:"Methanylylidene group
142:
24:
1242:chemical nomenclature
157:. When closed, as in
141:
22:
16:Chemical group (=CH–)
117:Overlapping methines
698:not C, H or O)
239:Methylylidyne group
98:methylidyne radical
78:systematic name is
50:. It consists of a
1140:Hypervalent iodine
297:Methanetriyl group
233:Methanetriyl group
167:, they often give
155:conjugated systems
143:
135:, or the compound
25:
1276:Functional groups
1263:
1262:
1201:Sulfenyl chloride
1179:
1178:
678:
677:
497:(only C, H and O)
338:Functional groups
91:methylidyne group
29:organic chemistry
1288:
1230:
1135:Trifluoromethoxy
703:
699:
502:
498:
351:
331:
324:
317:
308:
301:
292:
286:
283:
280:
279:
256:
228:
227:
226:
217:or methanediyl −
215:Methylene bridge
211:
210:
209:
200:or methylidene =
194:
193:
192:
166:
134:
112:
105:
95:
45:
41:functional group
1296:
1295:
1291:
1290:
1289:
1287:
1286:
1285:
1266:
1265:
1264:
1259:
1228:
1220:
1175:
1130:Trichloromethyl
1125:Trifluoromethyl
1099:
1076:
1038:
1015:
910:
879:Phosphine oxide
831:
697:
695:
694:
692:
690:
688:
686:
684:
674:
634:
577:
496:
495:
490:
485:
475:
349:
348:
340:
335:
305:
304:
293:
289:
277:
275:
258:
257:
253:
248:
225:
222:
221:
220:
218:
208:
205:
204:
203:
201:
198:Methylene group
191:
188:
187:
186:
184:
177:
165:
161:
133:
129:
125:
119:
110:
100:
93:
84:methanylylidene
43:
39:is a trivalent
17:
12:
11:
5:
1294:
1292:
1284:
1283:
1278:
1268:
1267:
1261:
1260:
1258:
1257:
1256:
1255:
1250:
1238:
1231:
1225:
1222:
1221:
1219:
1218:
1216:Sulfinylamines
1213:
1208:
1203:
1198:
1196:Phosphoramides
1193:
1191:Isothiocyanate
1187:
1185:
1181:
1180:
1177:
1176:
1174:
1173:
1168:
1167:
1166:
1156:
1155:
1154:
1144:
1143:
1142:
1137:
1132:
1127:
1122:
1111:
1109:
1101:
1100:
1098:
1097:
1092:
1086:
1084:
1078:
1077:
1075:
1074:
1069:
1067:Selenenic acid
1064:
1062:Seleninic acid
1059:
1057:Selenonic acid
1054:
1048:
1046:
1040:
1039:
1037:
1036:
1031:
1025:
1023:
1017:
1016:
1014:
1013:
1008:
1003:
998:
993:
988:
983:
978:
973:
968:
963:
958:
953:
948:
943:
938:
937:
936:
926:
920:
918:
912:
911:
909:
908:
903:
898:
893:
892:
891:
881:
876:
871:
866:
865:
864:
854:
853:
852:
850:Phosphodiester
841:
839:
833:
832:
830:
829:
824:
819:
814:
809:
804:
799:
794:
789:
784:
779:
774:
769:
764:
759:
754:
749:
744:
739:
734:
729:
728:
727:
722:
711:
709:
700:
696:(one element,
680:
679:
676:
675:
673:
672:
671:
670:
660:
659:
658:
653:
642:
640:
636:
635:
633:
632:
627:
622:
621:
620:
610:
609:
608:
603:
598:
587:
585:
579:
578:
576:
575:
573:Methylenedioxy
570:
565:
564:
563:
558:
548:
547:
546:
541:
531:
530:
529:
519:
514:
508:
506:
499:
477:
476:
474:
473:
468:
463:
462:
461:
456:
446:
445:
444:
439:
434:
429:
424:
419:
409:
408:
407:
402:
392:
391:
390:
385:
380:
375:
370:
365:
354:
352:
350:(only C and H)
342:
341:
336:
334:
333:
326:
319:
311:
303:
302:
287:
250:
249:
247:
244:
243:
242:
236:
230:
223:
212:
206:
195:
189:
176:
173:
118:
115:
37:methine bridge
15:
13:
10:
9:
6:
4:
3:
2:
1293:
1282:
1279:
1277:
1274:
1273:
1271:
1254:
1251:
1249:
1246:
1245:
1244:
1243:
1239:
1237:
1236:
1232:
1227:
1226:
1223:
1217:
1214:
1212:
1209:
1207:
1204:
1202:
1199:
1197:
1194:
1192:
1189:
1188:
1186:
1182:
1172:
1169:
1165:
1162:
1161:
1160:
1157:
1153:
1150:
1149:
1148:
1145:
1141:
1138:
1136:
1133:
1131:
1128:
1126:
1123:
1121:
1118:
1117:
1116:
1113:
1112:
1110:
1108:
1107:
1102:
1096:
1095:Telluroketone
1093:
1091:
1088:
1087:
1085:
1083:
1079:
1073:
1070:
1068:
1065:
1063:
1060:
1058:
1055:
1053:
1050:
1049:
1047:
1045:
1041:
1035:
1032:
1030:
1027:
1026:
1024:
1022:
1018:
1012:
1009:
1007:
1004:
1002:
999:
997:
994:
992:
989:
987:
984:
982:
981:Sulfonic acid
979:
977:
974:
972:
971:Sulfinic acid
969:
967:
966:Thiosulfonate
964:
962:
959:
957:
956:Thiosulfinate
954:
952:
951:Sulfenic acid
949:
947:
944:
942:
939:
935:
932:
931:
930:
927:
925:
922:
921:
919:
917:
913:
907:
906:Phosphaallene
904:
902:
901:Phosphaalkyne
899:
897:
896:Phosphaalkene
894:
890:
887:
886:
885:
882:
880:
877:
875:
872:
870:
867:
863:
860:
859:
858:
855:
851:
848:
847:
846:
843:
842:
840:
838:
834:
828:
825:
823:
820:
818:
815:
813:
810:
808:
805:
803:
800:
798:
795:
793:
790:
788:
785:
783:
780:
778:
775:
773:
770:
768:
765:
763:
760:
758:
755:
753:
750:
748:
745:
743:
740:
738:
735:
733:
730:
726:
723:
721:
718:
717:
716:
713:
712:
710:
708:
704:
701:
681:
669:
666:
665:
664:
661:
657:
654:
652:
649:
648:
647:
644:
643:
641:
637:
631:
628:
626:
623:
619:
616:
615:
614:
611:
607:
604:
602:
599:
597:
594:
593:
592:
589:
588:
586:
584:
580:
574:
571:
569:
568:Ethylenedioxy
566:
562:
559:
557:
554:
553:
552:
549:
545:
542:
540:
537:
536:
535:
532:
528:
525:
524:
523:
520:
518:
515:
513:
510:
509:
507:
503:
500:
494:
488:
483:
478:
472:
469:
467:
464:
460:
457:
455:
452:
451:
450:
447:
443:
440:
438:
435:
433:
430:
428:
425:
423:
420:
418:
415:
414:
413:
410:
406:
403:
401:
398:
397:
396:
393:
389:
386:
384:
381:
379:
376:
374:
371:
369:
366:
364:
361:
360:
359:
356:
355:
353:
347:
343:
339:
332:
327:
325:
320:
318:
313:
312:
309:
299:
298:
291:
288:
285:
282:
271:
267:
264:
263:
255:
252:
245:
240:
237:
234:
231:
216:
213:
199:
196:
182:
179:
178:
174:
172:
170:
160:
156:
151:
148:
140:
136:
130:C=CH−CH=CH−CH
124:
116:
114:
107:
103:
99:
92:
87:
85:
81:
80:methylylidene
77:
73:
69:
65:
61:
57:
53:
49:
42:
38:
34:
33:methine group
30:
21:
1281:Substituents
1240:
1233:
1147:Vinyl halide
1104:
1034:Borinic acid
1029:Boronic acid
1006:Thioxanthate
404:
346:Hydrocarbons
296:
290:
284:
276:. Retrieved
273:
265:
261:
254:
181:Methyl group
152:
144:
120:
108:
101:
88:
83:
79:
71:
67:
36:
32:
26:
1211:Thiocyanate
1206:Sulfonamide
1171:Perchlorate
1159:Acyl halide
1120:Fluoroethyl
1001:Thionoester
889:Phosphonium
874:Phosphinate
869:Phosphonous
857:Phosphonate
556:Hydroperoxy
378:Cyclopropyl
60:double bond
1270:Categories
1115:Haloalkane
986:Thioketone
941:Persulfide
837:Phosphorus
802:Isocyanate
792:Isonitrile
693:or oxygen
691:hydrogen,
687:not being
668:Orthoester
561:Dioxiranes
539:Enol ether
427:1-Propenyl
278:2015-03-05
272:) database
246:References
123:piperylene
74:, but its
1248:inorganic
1082:Tellurium
996:Thioester
961:Sulfoxide
946:Disulfide
934:Sulfonium
884:Phosphine
862:Phosphite
845:Phosphate
777:Carbamate
752:Hydrazone
685:element,
683:Only one
656:Anhydride
395:Methylene
162:(=CH−CH=)
1229:See also
1164:Chloride
1090:Tellurol
1044:Selenium
1011:Xanthate
725:Ammonium
707:Nitrogen
689:carbon,
646:Carboxyl
613:Aldehyde
601:Acryloyl
583:carbonyl
487:hydrogen
442:Cumulene
175:See also
169:aromatic
147:nitrogen
64:hydrogen
58:and one
1253:organic
1052:Selenol
976:Sulfone
929:Sulfide
827:NONOate
822:Nitroso
812:Nitrite
807:Nitrate
797:Cyanate
787:Nitrile
772:Amidine
767:Imidate
737:Nitrene
732:Hydrazo
720:Enamine
651:Acetoxy
639:carboxy
606:Benzoyl
544:Epoxide
527:Methoxy
517:Alcohol
471:Carbene
405:Methine
294:(2007)
235:>CH−
159:benzene
111:>CH−
72:methene
68:methyne
48:methane
1152:Iodide
1072:Selone
916:Sulfur
625:Ketone
618:Ketene
596:Acetyl
551:Peroxy
522:Alkoxy
512:Acetal
493:oxygen
482:carbon
466:Alkyne
459:Benzyl
454:Phenyl
437:Allene
432:Crotyl
412:Alkene
400:Bridge
388:Pentyl
373:Propyl
363:Methyl
274:. 2007
52:carbon
1184:Other
1021:Boron
991:Thial
924:Thiol
817:Nitro
782:Imide
762:Amide
747:Oxime
742:Imine
715:Amine
663:Ester
630:Ynone
534:Ether
505:R-O-R
480:Only
422:Allyl
417:Vinyl
383:Butyl
368:Ethyl
358:Alkyl
270:ChEBI
76:IUPAC
56:bonds
1106:Halo
591:Acyl
491:and
449:Aryl
44:=CH−
31:, a
757:Azo
241:≡C−
113:).
94:≡CH
82:or
70:or
35:or
27:In
1272::
489:,
484:,
266:.
219:CH
202:CH
185:CH
104:CH
86:.
330:e
323:t
316:v
281:.
262:"
229:−
224:2
207:2
190:3
183:−
164:3
132:3
128:2
126:H
102:⫶
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
