A method for preparing a desired comonomer product from an olefin feed comprising: providing a reactor and one or more, but less than three gas/liquid phase separators; feeding to said reactor said olefin feed and a catalyst having an olefin selectivity of at least 90 mol% to said desired comonomer product; reacting in said reactor said olefin feed and said catalyst under reaction conditions sufficient to produce an effluent comprising said desired comonomer product, reaction byproducts, and unreacted olefin; and separating said desired comonomer product from said effluent in said less than three gas/liquid phase separators to attain an olefinic purity of desired comonomer product of at least 98.5 mol%, wherein the catalyst comprises the combination of: 1) a ligand selected form the group consisting of: and 2) a metal precursor compound characterized by the general formula Cr n where each L is independently selected from the group consisting of halide, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, hydroxy, boryl, silyl, amino, amine, hydrido, allyl, diene, seleno, phosphino, phosphine, ether, thioether, carboxylates, thio, 1,3-dionates, oxalates, carbonates, nitrates, sulfates, ethers, thioethers, and combinations thereof, wherein two or more L groups may be combined in a ring structure having from 3 to 50 non-hydrogen atoms; and n is 1, 2, 3, 4, 5, or 6; and 3) optionally, one or more activators, wherein said desired comonomer product is an alpha-olefin oligomer, and wherein the number of distillation columns is not more than the sum of one plus a number of alpha-olefin oligomers desired to be separated in said desired comonomer product. providing a reactor and one or more, but less than three gas/liquid phase separators; feeding to said reactor said olefin feed and a catalyst having an olefin selectivity of at least 90 mol% to said desired comonomer product; reacting in said reactor said olefin feed and said catalyst under reaction conditions sufficient to produce an effluent comprising said desired comonomer product, reaction byproducts, and unreacted olefin; and separating said desired comonomer product from said effluent in said less than three gas/liquid phase separators to attain an olefinic purity of desired comonomer product of at least 98.5 mol%, wherein the catalyst comprises the combination of: 1) a ligand selected form the group consisting of: and 2) a metal precursor compound characterized by the general formula Cr n where each L is independently selected from the group consisting of halide, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, hydroxy, boryl, silyl, amino, amine, hydrido, allyl, diene, seleno, phosphino, phosphine, ether, thioether, carboxylates, thio, 1,3-dionates, oxalates, carbonates, nitrates, sulfates, ethers, thioethers, and combinations thereof, wherein two or more L groups may be combined in a ring structure having from 3 to 50 non-hydrogen atoms; and n is 1, 2, 3, 4, 5, or 6; and 3) optionally, one or more activators, wherein said desired comonomer product is an alpha-olefin oligomer, and wherein the number of distillation columns is not more than the sum of one plus a number of alpha-olefin oligomers desired to be separated in said desired comonomer product. 1) a ligand selected form the group consisting of: and 2) a metal precursor compound characterized by the general formula Cr n where each L is independently selected from the group consisting of halide, alkyl, substituted alkyl, cycloalkyl, substituted cycloalkyl, heteroalkyl, substituted heteroalkyl, heterocycloalkyl, substituted heterocycloalkyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, alkoxy, aryloxy, hydroxy, boryl, silyl, amino, amine, hydrido, allyl, diene, seleno, phosphino, phosphine, ether, thioether, carboxylates, thio, 1,3-dionates, oxalates, carbonates, nitrates, sulfates, ethers, thioethers, and combinations thereof, wherein two or more L groups may be combined in a ring structure having from 3 to 50 non-hydrogen atoms; and n is 1, 2, 3, 4, 5, or 6; and 3) optionally, one or more activators, wherein said desired comonomer product is an alpha-olefin oligomer, and wherein the number of distillation columns is not more than the sum of one plus a number of alpha-olefin oligomers desired to be separated in said desired comonomer product.