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Table 2 Solution ROP of rac -lactide for Ti(1–6)(O i Pr) 2 in 10 ml of toluene at 80°C in a 100:1 [ rac -lactide]:[initiator]

From: Monomeric Ti(IV) homopiperazine complexes and their exploitation for the ring opening polymerisation of rac-lactide

 

Time (hours)

Conv. (%)a

M n b

PDIb

P r c

Ti(1)(OiPr)2

24

23

1250

1.63

-d

Ti(2)(OiPr)2

24

8

-

-

-d

Ti(3)(OiPr)2

24

27

4700

1.17

-d

Ti(4)(OiPr)2

24

12

700

1.01

-d

Ti(5)(OiPr)2

24

50

8200

1.06

0.44

Ti(6)(OiPr)2

24

32

6950

1.11

0.44

  1. aConversion ascertained by 1H NMR spectroscopy. bMolecular weight and PDI determined by GPC (THF) using polystyrene standards. cP r as calculated from 1H NMR homonuclear decoupled spectroscopy in CDCl3.dP r could not be accurately determined, strong tacticity was not observed.
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BMC Chemistry

ISSN: 2661-801X

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