A catalyst system, reaction method and application for selective oligomerization of ethylene
A catalyst and selectivity technology, applied in the direction of catalytic reaction, catalyst, carbon compound catalyst, etc., can solve the problems of high methylene cyclopentane content and low total selectivity of α-olefins, and achieve high selectivity and total selectivity High sex, low selectivity
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[0051] In an embodiment of the present invention, the preparation method of ligand a may include the following steps:
[0052] (1) Preparation of Ph 2 PPhBr
[0053] Take a certain amount of 1,2-dibromobenzene, add a small amount of n-hexane and put it in the refrigerator to cool for 10-20min for later use. Take a certain amount of n-BuLi, add a small amount of n-hexane and put it in the refrigerator to cool for 10-20min, then take out the above two drugs, slowly add n-BuLi dropwise to the above-mentioned standby solution, stir and react for about 30min, add a small amount of n-BuLi to the solution. Ph after dilution with alkane 2 PCl was added dropwise and stirred overnight. After the reaction is complete, the lithium salt is filtered out with a sand core funnel, and the solution is distilled under reduced pressure to remove the solvent to obtain a colorless oily product Ph 2 PPhBr.
[0054] (2) Preparation of Ph 2 PPhP(NR 3 R 4 )(NR 5 R 6 )
[0055] Take a certain...
Embodiment 1
[0067] 1. Preparation of N,N,N',N'-tetramethyl-1-(2-(methyl(phenyl)phosphino)phenyl)-phosphine diamine (L1):
[0068]
[0069] Take (2-bromophenyl) (methyl) (phenyl) phosphine (1.71g, 5mmol), add an appropriate amount of n-hexane and put it in the refrigerator for later use, take a certain amount of n-BuLi (0.32g, 5mmol), add a small amount of n-hexane Put the alkane in the refrigerator to cool for 10-20min, then take out the above two medicines, slowly add n-BuLi dropwise to the above-mentioned standby solution, and stir and react for about 30min. Take 1-chloro-N,N,N',N'-tetramethylphosphine diamine (0.77g, 5mmol), add an appropriate amount of n-hexane, put it in the refrigerator, after 15-20min, take out the above solution, put 1-chloro-N ,N,N',N'-Tetramethylphosphine diamine was slowly added to the above mixed solution, stirred overnight, then filtered and vacuum-dried to obtain a yellow oil, then added an appropriate amount of n-hexane and stirred, fully mixed and put i...
Embodiment 2
[0076] Same as Example 1. The difference is that R 3 , R 4 is ethyl, R 5 , R 6 is ethyl. The distribution of oligomerization products is shown in Table 1, and the experimental conditions and catalyst activities are shown in Table 2.
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