Enantiomorphic Sites and Stereospecific Polymerization of Chiral 1-Olefins

  • Francesco Ciardelli
  • Carlo Carlini
  • Angelina Altomare

Abstract

The main objective of the present contribution is on the one side to show the diagnostic potentiality offered by the use of chiral monomers and on the other side to discuss relationships between stereochemistry at the prochiral face and side chain in the monomer.

Keywords

Titanium Zirconium Adduct Fractionation Oligomer 

List of Symbols and Abbreviations

(R)(S)4MH

is racemic 4 methyl-l-hexene

(R)(S)3MP

is racemic 3-methyl-1 -pentene

(R)(S)DMO

is racemic 3,7-dimethyl-l-octene

(S)3MP

is optically active (5)-3-methyl-1-pentene

(R)(S)3MR

is racemic 3-methyl-1-hexene

EB

is “internal” Lewis base

EB

is “external” Lewis base

EtB

is ethyl benzoate

PC

is p-cresol

MT

is p-methyl toluate

(-)MtB

is (-)-menthyl benzoate

(-)MA

is (-)-menthyl anisate

(-)MtP

is (-)-dimenthyl terephthalate

MP

is dimethyl terephthalate

EA

is ethyl anisate

TEA

is triethylaluminium

TIBA

is triistfbutylaluminium

PMA

is (R)-N, N-diethyl-α-phenylethylamine

PIN

is(-)-α-pinene

MtA

is(-)menthyl acetate

(S)2MBP

is bis[(S)-2-methylbutyl] phthalate

PES

is phenyltriethoxysilane

[α]D25

is specific optical rotation

D763 and D732

are the optical densities of the IR bands

Pp = Pm(l—C)/C, where Pm

is the optical purity of the non-polymerized monomer and C is the conversion

Pp

is the optical purity of polymerized monomer

E = Pp/([B*]/[Ti]) (%), where [B*]

is the concentration of optically active Lewis base in the catalyst

Rp(R)/Rp(S)

is the ratio of the polymerization rates of (R)- and (S)- enantiomer of the monomer, respectively

CW

catalyst = MgCl2/ IB/PC/AlEt3/TiCl4/Al(iBu)3-EB

CH

type catalyst was obtained from a soluble MgCl2-ROH adduct

MAO

is methylalumoxane

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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • Francesco Ciardelli
    • 1
    • 2
  • Carlo Carlini
    • 3
  • Angelina Altomare
    • 1
  1. 1.Dipartimento di Chimica e Chimica IndustrialeUniversità di PisaPisaItaly
  2. 2.Centro CNR delle Macromolecole Stereoordinate ed Otticamente AttivePisaItaly
  3. 3.Dipartimento di Chimica Industriale e dei MaterialiUniversità di BolognaBolognaItaly

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