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By James C. W. Chien

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Additional info for Coordination Polymerization. A Memorial to Karl Ziegler

Example text

Preparation of poly-(R) (S)-4-methyl-l-hexene 4-methyl-l-hexene CH by hydrogenation (14). CH HI in 9 C -A/v\ c II CH £ of the polymer from raoemic 9 H-C-CH. , 3 C H 2 5 (R) + = CH - C = CH - C = I I I CH CH CH 0 CH. C - C - H 3 , C H 2 5 l '3; U ^4 9*3. * H-C-CH, H,C-C-H | 3 3 p C H C H 2 5 2 5 (R) (S) —^^ - CH i - CH2 '* H-C-CH i C 2H5 (R) CH0 - ' CK (S) - I CH. 2 - I# H C-C-H 3 i C 2H5 (S) C H-C-CH , 3 C - CH '# H C-C-H i 2H5 (S) H ^ Λ / νλ - C H I CH2 I# H-C-CH 3 i C 2 5 (R) H /Ni-Raney 2 CH2 CHwvV\ CH0 ψ 2 = i2 (S) | CH C - I H C-C-H 3 !

AS SHOWN I N T A B L E 3 S T E R E O S E L E C T I V I T Y FOR ( R ) ( s ) - U - M H SEEMS DOUBTFUL ONLY I N THE CASE OF SOLUBLE CATALYST OBTAINED FROM T I I C E ^ C O ^ ) ^ AND A L I C ^ C G H J ) * ( l 8 ) WHICH ALSO ARE NOT VERY STEREOSPECIFIC. CONVENTIONAL CATALYSTS SHOW S I M I L A R S T E R E O S E L E C T I V I T Y (6) , WHILE A MUCH HIGHER VALUE HAS B E E N ACHIEVED MORE RECENTLY I N THE CASE OF RACEMIC U-MH U S I N G A CATALYST OBTAINED FROM A I R 3 AND T I C L ^ SUPPORTED ON MGCL2 (l8).

Polymerization of raaemio 4-methyl-l-hexene to: (a) random copolymer of the two antipodes; (b) mixture of homopolymers of the two antipodes. CH„ = CH 2 ι H - C C (R) C H n = CH 2 ι CH, H_C-C-H C 2 HS 4MH (S) 2 H5 4MH CH - CH, - CH - CH^ - CH - CH. C-C-H J ι 2 H5 C ( R) H 2 5 (S) H_C-C-H 3 H-C-CH. I C 2 H C 5 (S) CH„ - CH ! C C 2 H5 (ft) 5 (R) - CHr CH. H - H 2 CH. H 3C - C C 2»S (S) H COORDINATION POLYMERIZATION (1) The steric irregularities associated with the presence of a random distribution of (S) or ( R ) asymmetric carbon atoms in the lateral chains of each macromolecule are not sufficient to hinder the packing of the chains in the crystalline lattice.

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