Corrigendum: Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide

An error in the units of k_p in Table 1 was found. The units should be 10⁻² s⁻¹ m⁻¹ instead of 10⁻¹² s⁻¹ m⁻¹.

Table 1. Polymerization data for rac-LA with initiators C1–C4.^[a]

Init.	kp^[b] [10^−2 s^−1 m^−1]	kapp^[c] [10^−4 s^−1]	Conv.^[d] [%]	Mtheo^[e] [g mol^−1]	Mn^[e] [g mol^−1]	Mw^[e] [g mol^−1]
C1	9.5±1.6	1.26±0.07	52±2	37 400	49 400	69 100
C2	8.2±1.2	1.09±0.10	52±2	37 400	35 000	49 000
C3	6.3±0.6	1.01±0.10	53±2	38 200	46 900	70 400
C4	7.1±1.1	1.03±0.15	55±2[45]	39 600	42 600	68 100

• [a] Conditions: 90 min, [M]/[I]=500, 150 °C, solvent free, technical LA (no further purification). [b] Determined by plotting k_app versus [I]. k_p [I] [M]=k_app [M]; k_p=k_app/[I] [c] Determined from the slope of the plots of ln([LA]₀/[LA]_t) versus time. [d] As determined by ¹H NMR spectroscopy. [e] Determined by GPC (in THF), M_n, theo: 72 000 g mol⁻¹ for 100 % conversion. [f] Polymerization with tin(II) 2-ethylhexanoate: 90 min., conv.=94 %, M_n=114 700 g mol⁻¹, PD=2.0.

The authors and the editorial office apologize for this oversight and for any inconvenience caused.