Payvasthoi organikii alyuminiy, payvasthoi khimiyavie, ki dar molekulaashon bandi alyuminiy-karbon (A1—S) dorand. Payvasthoi organikii alyuminiy purra RjAl va nopurra R2A1X yo RAlXj meshavand (dar in 40 R—SN3, S2Nb, SvN8 va sh X — galogen, OR yo N). Alyuminiytrialkilho RjAl (R— —SNz, CfHs va r.) moddahoi moei berang buda, az tasiri oksigenu nami vayron meshavand. Baroi hamin ham bo onnh dar muhiti gazhoi inerti kor mekunavd. Payvasthoi organikii alyuminiy bo efir, amin, tioefir va fosfinho ba reaksiya daromada komplekshoi tetraedri hosil menamoyand. In guna kompleksho to darajae faoland, ki dar oksigeni havo mesuzand. Payvasthoi organikii alyuminiy Payvasthoi organikii alyuminiyro az ruy reaksiyai zerin hosil mekunand:
bSeNgVg + 2A1 + 3Mg 2(S*N5)3A1 + + 3iMgBr2.
Payvasthoi organikii alyuminiy dar sanoat hamchun katalizatori polimerizasiyai olefinno va inchunin baroi istehsoli alyuminiyi kholis istifoda meshavand.