Payvasthoi sikli

Payvasthoi sikli, payvasthoi tasalsul, payvasthoi khimiyavie (asosan organiki), ki molekulaashon az yak yo yakchand halqa (ba istiloh sikl yo yadro) iboratand, ki dar yake 3 yo az in ham ziyod atom dorad.

JCH

sn,       n,s—sn,          ns ^khsn

n,s—sn, n_as^ ^SN, HC_V^CH I        sn,       sn

Halqahoi 5 va 6- uzvi az hama mamuland, zero onho ba osoni tashakkul meyoband. Payvasthoi sikliro vobasta ba tabiati atomhoi siklhosilkunanda ba payvasthoi izosikli yo karbosikli (halqaashon tanho az atomhoi karbon iboratand) va geterosikli (dar halqaashon gayr az ato­mi karbon yak yo yakchand atomhoi di­gar elementho niz vujud dorand) judo mekunand. Ba guruhi yakum payvasthoi alisikli (siklopropan —  va siklopentan—I), payvasthoi aromati (benzol—III), ba guruhi duyum oksidi etilen (IV), piridin (V), tetrazol (VI) mansuband.

Dar Payvasthoi siklie, ki seryadroand, yadroho az ham judo (masalan, dar stilben — VII) yo bo yak bandi basit ba ham payvast meshavand (masalan, dar difenil — VIII) yo ki onho yak (IX) yo du atomi mushtarak dorand (masalan, naftalin — X, dekalin —XI). Dar bayni Payvasthoi sikli katenanho (XII) guruhi makhsusro tashkil medihand. Molekulai onho az rui prinsipi silsilai muqarrri (azo dar azo) payvast shudaand. Ba Payvasthoi siklii noorganiki baze payvasthoi bor (borazol); fosfor (fosfonitrilkhloridho), silisiy (siklosilokeanho) mansuband. Nigared niz Khimiyai organiki.