Payvasthoi organikii litiy, payvasthoi khimiyavie, ki dar molekulaashon bandi litiy-karbon (Li—S) dorand, chunonchi, R—Li (R— radikal). Payvasthoi organikii litiyi alifaty moddahoi kristalli (R=CH3,G2H5 var.), moei reliz (R = n — S3N7, n — S4NE va r.) yo moddai zudgudozi mummonand buda, dar karbogidridho va efirho nagz hal meshavand. Payvasthoi organikii litiyP. o. l.-i aromaty moddanoi kristallii safed yo zardtobn dar karbogid- ridu efirno halnashavandaand.
Payvasthoi organikii litiyro az litiy va galogenalkilho (yo galogeparilho) dar muhiti karbogidrid yo efir hosil mekunand: RX + 2I RLi -j- LiX. Payvasthoi organikii litiy khele faol buda, az tasiri oksigen, nami va gazi karbonat tez vayron meshavand. Binobar in bo onho dar muhiti gazhoi inerti yo nitrogeni khushk kor kardan lozim ast. Dar sanoat Payvasthoi organikii litiyro hangomi hosil kardani kauchukhoi butadiyoni va izopreni hamchun katalizator istifoda mebarand.