A process for producing a poly alpha-olefin, PAO, the process comprising: contacting a feed comprising a C 6 -C 32 alpha-olefin with a catalyst system comprising an unsymmetrical metallocene compound, a non-aromatic hydrocarbon soluble activator compound, and a non-aromatic hydrocarbon solvent in a polymerization reactor under polymerization conditions to effect a polymerization reaction to obtain a polymerization reaction mixture comprising vinylidenes, tri-substituted vinylenes, optional di-substituted vinylenes, and optional vinyls; and obtaining an unsaturated PAO product from the polymerization reaction mixture, wherein the unsaturated PAO product comprises vinylidenes, optional tri-substituted vinylenes, optional di-substituted vinylenes, and optional vinyls, wherein the metallocene compound is represented by Formula: wherein: each R. 1, R 2, and R 3 is, independently, hydrogen or a substituted or unsubstituted linear, branched, or cyclic C 1 -C 20 hydrocarbyl group; R 6, R 7, R 17, and R 18 are each independently hydrogen; a substituted or unsubstituted linear, branched, or cyclic C 4 -C 30 hydrocarbyl group; or R 6 and R 7, R 7 and R 17, or R 17 and R 18, taken together with the carbon atoms in the indenyl ring to which they are directly connected, collectively form one or more substituted or unsubstituted rings annelated to the indenyl ring; R 12, R 13, R 14, and R 15, are each independently a substituted or unsubstituted linear, branched, or cyclic C 4 -C 20 hydrocarbyl group; R 16 is a substituted or unsubstituted linear, branched, or cyclic C 4 -C 20 hydrocarbyl group or silylcarbyl group; each X is independently a halogen, a hydride, an amide, an alkoxide, a sulfide, a phosphide, a diene, an amine, a phosphine, an ether, a C 1 -C 20 substituted or unsubstituted linear, branched, or cyclic hydrocarbyl group, or two or more X moieties together form a fused ring or ring system; M is a transition metal, preferably group 3, 4 or 5, having an integer coordination number of v, such as 3, 4, or 5; and m is an integer equal to v-2, such as 1, 2, or 3 wherein preferably at least one of R 1, R 2, and R 3 is not hydrogen and at least one of R 1, R 2, and R 3 is hydrogen. wherein R 2 is hydrogen and one of R 3 and R 3 is a substituted or unsubstituted linear, branched, or cyclic C 1 -C 6 hydrocarbyl group, and the other of R 1 and R 3 is a hydrogen, contacting a feed comprising a C 6 -C 32 alpha-olefin with a catalyst system comprising an unsymmetrical metallocene compound, a non-aromatic hydrocarbon soluble activator compound, and a non-aromatic hydrocarbon solvent in a polymerization reactor under polymerization conditions to effect a polymerization reaction to obtain a polymerization reaction mixture comprising vinylidenes, tri-substituted vinylenes, optional di-substituted vinylenes, and optional vinyls; and obtaining an unsaturated PAO product from the polymerization reaction mixture, wherein the unsaturated PAO product comprises vinylidenes, optional tri-substituted vinylenes, optional di-substituted vinylenes, and optional vinyls, wherein the metallocene compound is represented by Formula: wherein: each R. 1, R 2, and R 3 is, independently, hydrogen or a substituted or unsubstituted linear, branched, or cyclic C 1 -C 20 hydrocarbyl group; R 6, R 7, R 17, and R 18 are each independently hydrogen; a substituted or unsubstituted linear, branched, or cyclic C 4 -C 30 hydrocarbyl group; or R 6 and R 7, R 7 and R 17, or R 17 and R 18, taken together with the carbon atoms in the indenyl ring to which they are directly connected, collectively form one or more substituted or unsubstituted rings annelated to the indenyl ring; R 12, R 13, R 14, and R 15, are each independently a substituted or unsubstituted linear, branched, or cyclic C 4 -C 20 hydrocarbyl group; R 16 is a substituted or unsubstituted linear, branched, or cyclic C 4 -C 20 hydrocarbyl group or silylcarbyl group; each X is independently a halogen, a hydride, an amide, an alkoxide, a sulfide, a phosphide, a diene, an amine, a phosphine, an ether, a C 1 -C 20 substituted or unsubstituted linear, branched, or cyclic hydrocarbyl group, or two or more X moieties together form a fused ring or ring system; M is a transition metal, preferably group 3, 4 or 5, having an integer coordination number of v, such as 3, 4, or 5; and m is an integer equal to v-2, such as 1, 2, or 3 each R. 1, R 2, and R 3 is, independently, hydrogen or a substituted or unsubstituted linear, branched, or cyclic C 1 -C 20 hydrocarbyl group; R 6, R 7, R 17, and R 18 are each independently hydrogen; a substituted or unsubstituted linear, branched, or cyclic C 4 -C 30 hydrocarbyl group; or R 6 and R 7, R 7 and R 17, or R 17 and R 18, taken together with the carbon atoms in the indenyl ring to which they are directly connected, collectively form one or more substituted or unsubstituted rings annelated to the indenyl ring; R 12, R 13, R 14, and R 15, are each independently a substituted or unsubstituted linear, branched, or cyclic C 4 -C 20 hydrocarbyl group; R 16 is a substituted or unsubstituted linear, branched, or cyclic C 4 -C 20 hydrocarbyl group or silylcarbyl group; each X is independently a halogen, a hydride, an amide, an alkoxide, a sulfide, a phosphide, a diene, an amine, a phosphine, an ether, a C 1 -C 20 substituted or unsubstituted linear, branched, or cyclic hydrocarbyl group, or two or more X moieties together form a fused ring or ring system; M is a transition metal, preferably group 3, 4 or 5, having an integer coordination number of v, such as 3, 4, or 5; and m is an integer equal to v-2, such as 1, 2, or 3