Table 2. Stereo-block copolymerization of l-LA and d-LA ^a .

Entry	Initiator	Type	Composition	Time b	M n(calc) c	M n d	PDI	T m e	ΔH m e
1	Lig3Mg–Cl	Di block	l(100)-b-d(100)	10	28 800	26 700	1.11	213	75
2	Lig3Mg–Cl	Di block	l(200)-b-d(200)	10	57 600	62 670	1.20	213	64
3	Lig4Mg–Cl	Di block	l(100)-b-d(100)	10	28 800	22 900	1.06	212	59
4	Lig4Mg–Cl	Di block	l(300)-b-d(300)	10	86 400	85 800	1.04	214	76
5	Lig4Mg–Cl	Di block	l(500)-b-d(500)	11	144 000	149 110	1.07	214	79
6	Lig4Mg–Cl	Di block	l(800)-b-d(800)	20	228 100	202 300	1.09	214	67
7	Lig4Mg–Cl	Tri block	l(100)-b-d(100)-b-l(100)	15	43 200	45 860	1.08	202	36
8	Lig4Mg–Cl	Tri block	l(300)-b-d(300)-b-l(300)	18	129 600	120 590	1.12	201	40
9	Lig4Mg–Cl	Tetra block	l(100)-b-d(100)-b-l(100)-b-d(100)	22	57 600	64 690	1.10	202	49
10	Lig4Mg–Cl	Tetra block	l(200)-b-d(200)-b-l(200)-b-d(200)	24	115 200	104 230	1.13	205	56

^aPolymerizations performed in CH₂Cl₂ (5 mL) at RT employing 5 μmol of the catalyst and 1 equiv. of BnOH. Almost full conversion (>0.98) was confirmed by ¹H NMR (500 Hz).

^bTotal polymerization time given in minutes. 5–10 min were maintained between each monomer addition, depending on the monomer amount and length of the polymer chain.

^cCalculated from monomer conversion assuming full benzyl alcohol participation. Values are given in g mol^–1.

^d M _n was determined by GPC analysis with CHCl₃ as the eluent.

^eMelting temperature and enthalpy of first DSC run. Values are given in °C and J g^–1, respectively.