Ring Index GEORGE NIKONOV Gainesville, Florida, USA with assistance of ALFRED L. FINOCCHIO Encenitas, California, USA Thisindexliststheheterocyclicparentringsystemsandhasbeencompiledfromtheoccurrencesofthosesystems andtheirderivativesinVolumes1-15inthetext,tables,equations,andschemes.Heterocycleshavebeenincluded whentheyoccurasastartingmaterial,isolableintermediate,oraproduct,butnotwhentheyarereportedasa nonisolableintermediateorasolvent. Compoundsaregenerallyclassifiedaccordingtotheirfullyunsaturatedparentcompound(butseebelow).Thus substituted,partiallysaturated,andfullysaturatedderivativesof,forexample,pyrroleareallindexedunderpyrrole. Benzoandsimilarderivativesareincludedunderthemostunsaturatedparentsystem(e.g.,quinoline,thienofuran, etc.).Foranygivenheterocyclicparentonlyoneindicatedhydrogenisomerappearsinthetext,typicallythemost stableorthelowestnumberedform;thusallinstancesofpyran,whetherofthe2H-or4H-form,areindexedunder 2H-pyran.Thechargesandadditionalvalencesforanyheterocyclicparentstructurearenotindicated. TheoverallstylefollowsthatusedinChemicalAbstractsandthefirsttwoeditionsofComprehensiveHeterocyclic Chemistry,butinordertokeepthesizeoftheindexwithinreasonableboundsmoreattentionhasbeenpaidtothe monocyclicandbicyclicringsandonlysystemscontaininguptosixfusedringshavebeenincluded.Forthesame reasonalimitonindividualringsizeinanysystemhasbeenplacedat12atoms.Alsocomplexesofmetals,clusters andcarcassstructuresarenotincluded. Heterocyclicsystemscanbenamedbyvariousmethods,dependingonringsize,thepresenceofmetalatoms,the availabilityoftrivialnames,etc.Forthisindexthenamingoftheheterocyclicparentshasgenerallyfollowedthe practicesofIUPAC.ThusHantzsch-Widmannameshavebeenemployedformonocyclicsystemsandfortheother systemswhenthesmallestringsizeisfiveatomsormore,butreplacementnomenclaturehasusuallybeenfollowed forbicyclicandhighersystemswhentheycontainthree-andfour-memberedrings.Thedrawingofcompoundsand namingwasdoneusingCSChemDrawUltraprogramwithanapplicationofACSsetting. Inadditiontothenameandstructureofeachparentsystem,theringnumberingofthesystemhasalsobeengiven ineverycase. Indexentriesaredividedintotwocategories,primaryandsecondary.Primaryindexentries(pagenumbersprinted inbold)occurwhenasignificantpartofachapterisdevotedtoaparticularringsystem.Secondaryindexentriesoccur whenaheterocyclicsystemismentionedinachapterdevotedtoothersystems.Thismaybe,forexample,asa startingmaterialorasaproduct,orinadiscussioncomparingproperties. 1 3 AsCP CGe 2 Phospharsirane Digermirane 1,718 1,749–793 AsSiTe CIrSi 1H-Tellurarsasilirene Siliridacyclopropane 1,679–693 1,749–793 BXY C(M)N X,Y-C,N,elements Metallaziridine 1,513–537;1,720 1,749–793 CAs(M) C(M)P Metallaarsirane Metallaphosphirane 1,749–793 1,749–793 CB2 C(M)S Diborirane Metallathiirane 1,759 1,749–793 C(M)Si 3H-Diborirene Metallasilirane 1,759 1,749–793 CCoP CMnN Phosphacobaltacyclopropane Azamanganacyclopropane 1,749–793 1,749–793 CFeP CMnP Phosphaferracyclopropane Phosphamanganacyclopropane 1,749–793 1,749–793 CFeS CMoP Thiaferracyclopropane Phosphamolybdacyclopropane 1,749–793 1,749–793 CGeS CMoS Thiagermirane Thiamolybdacyclopropane 1,787 1,749–793 CNNi Thiagermirene Azanickelacyclopropane 1,787 1,749–793 CGeSe CNO Selenagermirane Oxaziridine 1,787 1,559–621 CGeTe Oxazirine Telluragermirane 1,559–621 1,787 2 3 RingIndex(3) CPRu CNP CORe 2H-Azaphosphirene Oxarhenacyclopropane 1,712,715 1,749–793 CNRe COS Azarhenacyclopropane Oxathiirene 1,749–793 1,641–677 CNS COTi Thiazirene Oxatitanacyclopropane 1,623–640 1,749–793 COV Thiazirene Oxavanadacyclopropane 1,623–640 1,749–793 CNSe COW Selenazirine Oxatungstacyclopropane 1,679–693 1,749–793 CNSi COZr Azasiliridine Oxazirconacyclopropane 1,773,773–774 1,749–793 CNV COsP Azavanadacyclopropane Phosphosmacyclopropane 1,749–793 1,749–793 COsS Azatungstacyclopropane Thiosmacyclopropane 1,749–793 1,749–793 CNZr COsSe Azazirconacyclopropane Selenosmacyclopropane 1,749–793 1,749–793 CNbO COsTe Oxaniobacyclopropane Tellurosmacyclopropane 1,749–793 1,679–693 CN2 CO2 Diaziridine Dioxirane 1,539–557 1,641–677;6,150f CPPt 3H-Diazirine Phosphaplatinacyclopropane 1,539–557;5,508 1,749–793 COFe CPRe Oxaferracyclopropane Phospharhenacyclopropane 1,749–793 1,749–793 COOs CPRu Oxosmacyclopropane Phospharuthenacyclopropane 1,749–793 1,749–793 CPSb RingIndex(3) 4 CPSb Disilirene Phosphastibirane 1,770 1,719 CSn 2 CPSe Distannirane Selenaphosphirene 1,786 1,679–693 CS 2 CPSi Dithiirane Phosphasilirane 1,641–677 1,773–774 CPW Dithiirane Phosphatungstacyclopropane 1,641–677 1,749–793 C B 2 Borirane CPb 2 1,513–537 Diplumbirane 1,770 1H-Borirene CPdS 1,513–537 Thiapalladacyclopropane 1,749–793 C Ge 2 Germirane CP 2 1,483–512 Diphosphirane 1,695–747,696,720,733 C N 2 Aziridine 1,1–104;6,100;7,290,290;9,337;2,82 1H-Diphosphirene 1,715 1H-Azirine 1,82;1,105–172;4,522,8,500 3H-Diphosphirene 1,713,720,733 CSW 2H-Azirene Thiatungstacyclopropane 1,105–172,151;6,155t;6,165t 1,749–793 C O 2 CSZr Oxirane Thiazirconacyclopropane 1,173–233;2,351,2,783,784 1,749–793 CSeSi Oxirene Selenasilirene 1,173–233,215;6,153f;6,169f; 1,641–677 6,182–183 CSiW C P 2 Silatungstacyclopropane Phosphirane 1,749–793 1,457–481 CSi 2 Disilirane 1H-Phosphirene 1,770 1,457–481;2,896;2,931 5 RingIndex(3) Si 3 C2S C2Te Thiirane Tellurirane 1,299–390;2,416 1,433–453 GeSi 2 Thiirene Disilagermacycloprop-1-ene 1,299–390;6,182;8,662 6,669 C2Se Ge2Si Selenirane Siladigermacyclopropane 1,433–453 2,954–955;3,1206 Selenirene 1-Sila-2,3-digermacycloprop-2-ene 1,433–453 2,964,969 C2Si Ge3 Silirane Trigermilcyclopropane 3,1213–1214 2,955;3,1206 1H-Silirene 1H-Trigermirene 1,483–512;2,931;3,1214 2,964 C Sn PSeC 2 1H-Stannirene Selenaphosphorirane 1,483–512 1,679–693 C(M)O Si3 Metallaoxirane Trisilacyclopropane 1,749–793 2,955 4 C(X)(Y)(Z) 1,2,3-Trisheteraetane [1,3]Digermetane 2,939–972 2,907–938 [1,2]Digermete 1,2,3-Trisheteraetene 2,911,926;9,932 2,939–972 C NO 2 4H-1,2-Oxazete CGe O 2 2,689–711 [1,2,4]Oxadigermetane 1,782 [1,2]Oxazetidine CGe2S 2,689–711 [1,2,4]Thiadigermetane 1,782 [1,3]Oxazetidine CGe Se 2,689–711 2 [1,2,4]Selenadigermetane 1,782 C2NS 2H-[1,2]Thiazete 2,713–773 CN P 2 [1,3,2]Diazaphosphetidine 2,939–972 4H-1,2-Thiazete 2,713–773 C As 2 2 [1,3]Diarsetane 2,889;9,893 [1,3]Thiazetidine 2,713–773,759 C GeO 2 [1,2]Oxagermetane C2NSe 2,924,924–925 [1,2]Selenazetidine 2,853–874 C GeS 2 C N [1,2]Thiagermetane 2 2 1,2-Diazete 2,917 2,623–687 C GeSe 2 2H-[1,2]Selenagermete 1,3-Diazete 2,853–874 2,623–687 C GeTe 2 [1,2]Telluragermetane [1,2]Diazete 2,853–874 2,667 C Ge 2 2 [1,2]Digermetane 1,2-Dihydro-[1,2]diazete 1,489;2,917 2,623–687 6 7 RingIndex(4) C SeTe 2 1,2-Dihydro-[1,3]diazete [1,2]Dioxetane 2,623–687 2,775–794 1,4-Dihydro-[1,2]diazete 1,2-Dioxete 9,440;2,623–687 2,775–794 C PSe 2 3,4-Dihydro-[1,2]diazete [1,2]Selenaphosphetane 2,623–687 2,853–874 [1,2]Diazetidine [1,3]Selenaphosphetane 2,623–687 2,853–874 C PSi 2 [1,3]Diazetidine 1,2-Dihydro-[1,2]phosphasilete 2,623–687 1,701f;2,907–938;2,907–938 C OS 2 1,2-Oxathiete [1,2]Phosphasiletane 2,795–809 2,917 C Ps 2 1,3-Oxathietane [1,3]Diphosphetane 2,795–809 2,876 C P 2 2 [1,2]Oxathietane 1,2-Diphosphete 2,795–809 1,469;2,875–905 C OSe 2 1,3-Oxaselenetane 1,3-Diphosphete 2,853–874 2,876;9,838,839 [1,2]Oxaselenetane 1,2-Dihydro-[1,2]diphosphete 2,853–874 1,469,469 C2OSi C2SSi 2H-1,2-Oxasilete 2H-1,2-Thiasilete 2,907–938 2,907–938 [1,3]Oxasiletane [1,3]Thiasiletane 2,912–913,924,925 2,912–913 C OTe C Sb 2 2 2 [1,2]Oxatelluretane [1,2]Distibetane 2,853–874 2,889 C O C SeTe 2 2 2 1,3-Dioxetane 1,3-Selenatelluretane 2,775–794;9,397 2,853–874 C Se RingIndex(4) 8 2 2 C Se 2 2 Metallacyclobutenes 1,2-Diselenete 2,555–621 2,853–874 1,3-Diselenetane Boretane 2,853–874 2,555–621 C (M) 3 [1,2]Diselenetane Metallacyclobutanes 2,853–874 2,555–621 C As 3 C2Si2 Arsete 1,2-Dihydro-1,2-Disilete 2,479–512 1,508–509 Arsete 1,2-Disilete 2,555–621 2,853–874;2,907–938 C B 3 Borete 2,555–621 [1,3]Disiletane 2,521 C B 3 Boretane 2,555–621 [1,3]Disiletane 2,907–938,910,918,918,921,922 C Bi 3 Bismuthete C SnTe 2,479–512;2,555–621 2 [1,2]Tellurastannetane C Co 2,853–874 3 1-Cobaltacyclobuta-1,3-diene 2,555–621 C S 2 2 1,3-Dithietane C Fe 3 2,811–852;6,469f;6,476f 1-Ferracyclobuta-1,3-diene 2,555–621 C Ge 1,2-Dithiete 3 Germetane 2,811–852 2,513–554 C Ir 3 [1,2]Dithietane 1-Iridacyclobuta-1,3-diene 2,811–852 2,555–621 C Te 2 2 C Mo 3 1,3-Ditelluretane 1-Molybdacyclobuta-1,3-diene 2,853–874 2,555–621 C N C B 3 3 Azete 2,3-Dihydro-borete 2,704–705;2,94,96;5,224;6,173t 2,555–621 9 RingIndex(4) P Se 2 2 Azetidine Thietane 1,38f,88;2,239–319, 2,389–428 240;9,323;2;3,36 C Sb 3 1,2-Dihydro-stibete 1,2-Dihydro-azete 2,505 2,87 C Se 3 Selenetane 2,3-Dihydro-azete 2,463–477 2,87 C Ni 3 2H-Selenete 1-Nickelacyclobuta-1,3-diene 2,463–477 2,555–621 C Si 3 C O 3 Siletane 2H-Oxete 1,494 2,321–364 C Ta 3 1-Tantalacyclobuta-1,3-diene Oxetane 2,555–621 2,321–364 C Te 3 C P Telluretane 3 1,2-Dihydro-phosphete 2,463–477 4,1164;14,921–922 2H-Tellurete C Pd 3 2,463–477 1-Palladacyclobuta-1,3-diene 2,555–621 C Ti 3 C Pt Titanetane 3 1-Platinacyclobuta-1,3-diene 2,555–621 2,555–621 C W 3 C Re 3 Tungstetane 1-Rhenacyclobuta-1,3-diene 2,555–621 2,555–621 C Zr C Rh 3 3 Zirconetane 1-Rhodacyclobuta-1,3-diene 2,555–621 2,555–621 C S P Se 3 2 2 2H-Thiete 1,3,2,4-diselenadiphosphethane 2,389–428 6,575 5 As 5 1H-Pentarsole 4,5-Dihydro-[1,2,3,4]oxatriazole 6,604f 6,425–439 CBN CN P 3 3 2H-[1,2,3,4]Triazaborole 1H-1,2,3,4-Triazaphosphole 6,620 6,583–601 CNOSeSi [1,3,5,2]Oxaselenazasilole 5H-1,2,4,3-Triazaphosphole 6,667 6,583–601 CNP Se 2 2,3-Dihydro-[1,4,2,3]selenazadiphosphole CN S 3 6,528t 1,2,3,4-Thiatriazole 6,441–484;6,486t;6,487t;6,494 CN PS 2 1,3,4,2-Thiadiazaphosphole 6,583–601 2,5-Dihydro-[1,2,3,4]thiatriazole 1,630,631 CN PSi 2 [1,3,2,4]Diazaphosphasilolidine 6,667 4,5-Dihydro-[1,2,3,4]thiatriazole CN P 5,507 2 2 1H-1,2,3,5-Diazadiphosphole 6,583–601 1,2,3,5-Thiatriazole 6,443t;6,485–498 5H-1,4,2,3-Diazadiphosphole 6,583–601 CN Si 3 CN2Se2 1H-1,2,4,3-Triazasilole 1,2,3,5-Diselenadiazole 6,494 6,517–581 CN 4 CN2S2 1H-Tetrazole 1(cid:2)4-[1,2,3,5]Dithiadiazole 5,444;5,598;6,257–423;5,215t; 6,517–581 6,465f;6,478 CP 4 3(cid:2)4-[1,3,2,4]Dithiadiazole 1H-Tetraphosphole 6,517–581 6,583–601 CN O 3 1,2,3,4-Oxatriazole [1,2,3,4]Tetraphospholane 6,425–439;6,478 2,967 CS 4 1,2,3,5-Oxatriazole [1,2,3,4]Tetrathiolane 6,425–439 1,668–669 10