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. Du-rac-lactate-de-lithium, g, 33 mmol) est mis en solution dans 50 mL de THF anhydre sous argon. Le milieu réactionnel est refroidi à 0°C puis du diphosgène (4 mL, 33 mmol) est ajouté goutte à goutte pendant 20 minutes. La solution est agitée 120 minutes à température ambiante puis contrôlée par RMN 1 H (apparition d'un doublet à 1.72 ppm)

. Dans-un-tube-de-schlenk-préalablement-séché-sous-vide,-le-l-lacoca, 1 mmol) est mis en suspension dans 270 µL de toluène (3.8 M) Le milieu réactionnel est agité à 80°C. A cette température, il devient homogène. 14 mg de Novozyme 435 sont alors ajoutés sous argon à l'aide d'une ampoule à solide. La réaction est agitée à 80°C. La conversion du monomère en polymère est suivie par prélèvements d'un échantillon de solution (quelques µL de milieu réactionnel) qui est concentré puis Après 2h30 d'agitation, la conversion est totale. On préleve alors un aliquot (20 µL) pour la chromatographie d'exclusion de taille (SEC) puis on ajoute de nouveau du L-lacOCA (120 mg, 1 mmol) ainsi que 270

. Pour-chaque-test and . Le-pivoca, le protocole suivant est utilisé Il est décrit ci-dessous dans le cas de la ROP amorcée à l'alcool benzylique et catalysée par la DMAP (Dp = 20). L'alcool benzylique est distillé sur CaH 2, La DMAP est recristallisée dans le toluène. Le PivOCA est recristallisé dans CH 2 Cl

. Dans-un-tube-de-schlenk-préalablement-séché-sous-vide and . Le-pivoca-)-butoca, 288 mg, 2 mmol) est mis en solution dans 2 mL de CH 2 Cl 2 . L'alcool benzylique (0.1 mmol, 11 µl) puis la DMAP (0.1 mmol, 12 mg)

. Deux-tests-de-rop-ont-Été-menés-avec-le-(-s-)-butoca, Il est ici décrit dans le cas de la ROP amorcée à l'alcool benzylique pour un rapport monomère/amorceur égal à 20. L'alcool benzylique est distillé sur CaH 2, La DMAP est recristallisée dans le toluène. Le (S)-ButOCA est recristallisé dans l'éther éthylique au moins deux fois juste avant d'être utilisé

. La-deuxième-Étape-correspond-À-la-synthèse-du, MepOCA à partir de l'hydroxyacide. A une solution d'acide (S)-3-hydroxy-2-methyl propanoique (2.1 g, 20 mmol) dans 60 mL de THF sont ajoutés une « pointe de spatule » de charbon actif et 1 Le milieu réactionnel est agité à 60°C pendant 2h, Après filtration du charbon actif, le solvant est évaporé. L'intermédiaire récupéré est dilué dans 60

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